The Experts below are selected from a list of 747 Experts worldwide ranked by ideXlab platform
Dominique Wolbert - One of the best experts on this subject based on the ideXlab platform.
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Pilot scale degradation of mono and multi volatile organic compounds by surface discharge plasma/TiO reactor Investigation of competition and synergism
Journal of Hazardous Materials, 2018Co-Authors: Aymen Amine Assadi, Abdelkrim Bouzaza, Sivachandiran Loganathan, Phuong Nguyen Tri, Sara Gharib-abou Ghaida, Anh Nguyen Tuan, Dominique WolbertAbstract:This paper mainly deals with the Isovaleraldehyde degradation with the help of a nonthermal plasma surface discharge (NPSD) coupled with photocatalysis. The efficiency of NPSD reactor, for gas treatment, was studied for different binary mixtures (1) mixture of aldehydes (Isovaleraldehyde and Butyraldehyde) and (2) mixture of aldehyde and amine (Isovaleraldehyde and Trimethylamine). A planar continuous reactor is used to investigate the effect of addition of another pollutant on the performance of oxidation process. A synergetic effect was observed by combining NPSD and photocatalysis for the degradation of mixture of pollutants. In addition, combined NPSD/photocatalysis has significantly enhanced the CO selectivity, as compared to NPSD alone. This is attributed to the formation of more reactive species due to the presence of TiO in the plasma discharge zone. Moreover, ozone and UV light on TiO, produced by plasma, have activated the surface leading to enhanced mineralization. In addition, the byproducts of each binary mixture were identified and evaluated.
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Isovaleraldehyde degradation using UV photocatalytic and dielectric barrier discharge reactors, and their combinations
Journal of Photochemistry and Photobiology A: Chemistry, 2015Co-Authors: Jordi Palau, Aymen Amine Assadi, Josep Penya-roja, Abdelkrim Bouzaza, Dominique Wolbert, Vicente Martínez-soriaAbstract:The abatement of Isovaleraldehyde present in air was carried out in UV photocatalytic and dielectric barrier discharge reactors (and their combinations) for concentrations up to 150 mg C m−3 and air flow rates ranging from 4 to 10 m3 h−1. A kinetic study was performed following a Langmuir–Hinshelwood model. Photocatalytic treatment of an Isovaleraldehyde and isovaleric acid mixture showed a clear inhibition of isovaleric acid abatement in presence of Isovaleraldehyde. Dielectric barrier discharge treatment of Isovaleraldehyde showed an increase of removal efficiency with applied voltage and a decrease with air flow rate and inlet concentration. Moreover, introduction of a catalyst into the dielectric barrier discharge reactor did not produce a significant effect (UV light off). However, a combination of both techniques significantly increased Isovaleraldehyde removal efficiency, indicating the treatment technique sequence had an effect on system performance. In conclusion, combined treatment showed promising results for the removal of VOCs, providing a synergic improvement in the removal of Isovaleraldehyde.
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Treatment of gaseous effluents by using surface discharge plasma in continuous reactors: Process modelling and simulation
The Canadian Journal of Chemical Engineering, 2014Co-Authors: Aymen Amine Assadi, Abdelkrim Bouzaza, Dominique WolbertAbstract:In the present work, the oxidation of Isovaleraldehyde, a typical pollutant of indoor air, is investigated by using two different plasma DBD reactors: cylindrical and planar reactor. The study of the influence of the specific energy shows that its increment is accompanied by an increase of the removal efficiency. In fact, when specific energy extends three times, the removal efficiency is increased from 5 to 40 %. Moreover an increase of the specific energy induces a higher mineralization due to byproducts oxidation with reactive species production. The same behaviour is observed with ozone production. A generic mathematical model is developed to represent the experimental results obtained. This model is based on several mass transfer steps occurring in series between bulk and plasma phases. The degradation reaction mechanism is supposed to occur on two steps. Firstly, Isovaleraldehyde leads to the formation of a fictitious equivalent intermediate (EI). In a second step, EI is transformed into CO and CO2. This approach gives a good agreement between modelling and experiments with a satisfactory overall description of byproducts formation. This original approach allows for the simulation of plasma oxidation kinetics process without knowing the complete chemical pathway.
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use of dbd plasma photocatalysis and combined dbd plasma photocatalysis in a continuous annular reactor for Isovaleraldehyde elimination synergetic effect and byproducts identification
Chemical Engineering Journal, 2014Co-Authors: Aymen Amine Assadi, Abdelkrim Bouzaza, Cédric Vallet, Dominique WolbertAbstract:Removal of Isovaleraldehyde from air was investigated experimentally by three processes: dielectric barrier discharge (DBD) plasma, photocatalysis and a DBD plasma/photocatalysis combination. The latter led to a synergetic effect. Many operating parameters were investigated in this study such as the specific energy of discharge, the inlet concentration of Isovaleraldehyde and the relative humidity. The UV light generated by the DBD plasma reactor did not activate the photocatalytic medium. Thus, its contribution to the removal of Isovaleraldehyde by photocatalysis could be ignored. On the other hand, the use of external UV light significantly improved the removal efficiency. Using a photocatalytic reactor in the presence of water vapor, in small amounts, had a promoting effect on the degradation due to the formation of OHradical dot radicals. The same phenomenon has been observed in other processes for small amounts of water in air. The identified and analyzed byproducts were classified into four groups: intermediate products (propionic acid, acetic acid and acetone), carbon monoxide, carbon dioxide and ozone. The carbon balance on carbon products was achieved at about 90%.
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Use of DBD plasma, photocatalysis, and combined DBD plasma/photocatalysis in a continuous annular reactor for Isovaleraldehyde elimination - Synergetic effect and byproducts identification
The Chemical Engineering Journal, 2014Co-Authors: Aymen Amine Assadi, Abdelkrim Bouzaza, Cédric Vallet, Dominique WolbertAbstract:Removal of Isovaleraldehyde from air was investigated experimentally by three processes: dielectric barrier discharge (DBD) plasma, photocatalysis and a DBD plasma/photocatalysis combination. The latter led to a synergetic effect. Many operating parameters were investigated in this study such as the specific energy of discharge, the inlet concentration of Isovaleraldehyde and the relative humidity. The UV light generated by the DBD plasma reactor did not activate the photocatalytic medium. Thus, its contribution to the removal of Isovaleraldehyde by photocatalysis could be ignored. On the other hand, the use of external UV light significantly improved the removal efficiency. Using a photocatalytic reactor in the presence of water vapor, in small amounts, had a promoting effect on the degradation due to the formation of OHradical dot radicals. The same phenomenon has been observed in other processes for small amounts of water in air. The identified and analyzed byproducts were classified into four groups: intermediate products (propionic acid, acetic acid and acetone), carbon monoxide, carbon dioxide and ozone. The carbon balance on carbon products was achieved at about 90%.
Aymen Amine Assadi - One of the best experts on this subject based on the ideXlab platform.
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Pilot scale degradation of mono and multi volatile organic compounds by surface discharge plasma/TiO reactor Investigation of competition and synergism
Journal of Hazardous Materials, 2018Co-Authors: Aymen Amine Assadi, Abdelkrim Bouzaza, Sivachandiran Loganathan, Phuong Nguyen Tri, Sara Gharib-abou Ghaida, Anh Nguyen Tuan, Dominique WolbertAbstract:This paper mainly deals with the Isovaleraldehyde degradation with the help of a nonthermal plasma surface discharge (NPSD) coupled with photocatalysis. The efficiency of NPSD reactor, for gas treatment, was studied for different binary mixtures (1) mixture of aldehydes (Isovaleraldehyde and Butyraldehyde) and (2) mixture of aldehyde and amine (Isovaleraldehyde and Trimethylamine). A planar continuous reactor is used to investigate the effect of addition of another pollutant on the performance of oxidation process. A synergetic effect was observed by combining NPSD and photocatalysis for the degradation of mixture of pollutants. In addition, combined NPSD/photocatalysis has significantly enhanced the CO selectivity, as compared to NPSD alone. This is attributed to the formation of more reactive species due to the presence of TiO in the plasma discharge zone. Moreover, ozone and UV light on TiO, produced by plasma, have activated the surface leading to enhanced mineralization. In addition, the byproducts of each binary mixture were identified and evaluated.
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Kinetic Modeling of VOC Photocatalytic Degradation Using a Process at Different Reactor Configurations and Scales
International Journal of Chemical Reactor Engineering, 2016Co-Authors: Aymen Amine Assadi, Bouzaza Abdelkrim, Wolbert DominiqueAbstract:AbstractThis work investigated the performance of Isovaleraldehyde (3-methylbutanal) removal from gas streams in photocatalytic reactors at room temperature. The feasibility of pollutant removal using the up-scaled reactor was systematically assessed by monitoring the removal efficiency at different operational parameters, such as geometries of reactor, air flow rate and inlet concentration. A proposal modeling for scaling up the photocatalytic reactors is described and detailed in this present study. In this context, the photocatalytic degradation of Isovaleraldehyde (Isoval) in gas phase is studied. In fact, the removal rate has been compared at different continuous flow reactors: a photocatalytic tangential reactor (PTR), planar reactor and P5000 pilot. The effects of the inlet concentration, flow rate, geometries and size of reactors on the removal efficiency are also studied. A kinetic model taking into account the mass transfer step is developed. The modeling is done by introducing an equivalent intermediate (EI) formed by the photo-oxidation of Isoval. This new approach has substantially improved the agreement between modeling and experiments with a satisfactory overall description of the mineralization from lab to pilot scales.
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Isovaleraldehyde degradation using UV photocatalytic and dielectric barrier discharge reactors, and their combinations
Journal of Photochemistry and Photobiology A: Chemistry, 2015Co-Authors: Jordi Palau, Aymen Amine Assadi, Josep Penya-roja, Abdelkrim Bouzaza, Dominique Wolbert, Vicente Martínez-soriaAbstract:The abatement of Isovaleraldehyde present in air was carried out in UV photocatalytic and dielectric barrier discharge reactors (and their combinations) for concentrations up to 150 mg C m−3 and air flow rates ranging from 4 to 10 m3 h−1. A kinetic study was performed following a Langmuir–Hinshelwood model. Photocatalytic treatment of an Isovaleraldehyde and isovaleric acid mixture showed a clear inhibition of isovaleric acid abatement in presence of Isovaleraldehyde. Dielectric barrier discharge treatment of Isovaleraldehyde showed an increase of removal efficiency with applied voltage and a decrease with air flow rate and inlet concentration. Moreover, introduction of a catalyst into the dielectric barrier discharge reactor did not produce a significant effect (UV light off). However, a combination of both techniques significantly increased Isovaleraldehyde removal efficiency, indicating the treatment technique sequence had an effect on system performance. In conclusion, combined treatment showed promising results for the removal of VOCs, providing a synergic improvement in the removal of Isovaleraldehyde.
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Treatment of gaseous effluents by using surface discharge plasma in continuous reactors: Process modelling and simulation
The Canadian Journal of Chemical Engineering, 2014Co-Authors: Aymen Amine Assadi, Abdelkrim Bouzaza, Dominique WolbertAbstract:In the present work, the oxidation of Isovaleraldehyde, a typical pollutant of indoor air, is investigated by using two different plasma DBD reactors: cylindrical and planar reactor. The study of the influence of the specific energy shows that its increment is accompanied by an increase of the removal efficiency. In fact, when specific energy extends three times, the removal efficiency is increased from 5 to 40 %. Moreover an increase of the specific energy induces a higher mineralization due to byproducts oxidation with reactive species production. The same behaviour is observed with ozone production. A generic mathematical model is developed to represent the experimental results obtained. This model is based on several mass transfer steps occurring in series between bulk and plasma phases. The degradation reaction mechanism is supposed to occur on two steps. Firstly, Isovaleraldehyde leads to the formation of a fictitious equivalent intermediate (EI). In a second step, EI is transformed into CO and CO2. This approach gives a good agreement between modelling and experiments with a satisfactory overall description of byproducts formation. This original approach allows for the simulation of plasma oxidation kinetics process without knowing the complete chemical pathway.
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use of dbd plasma photocatalysis and combined dbd plasma photocatalysis in a continuous annular reactor for Isovaleraldehyde elimination synergetic effect and byproducts identification
Chemical Engineering Journal, 2014Co-Authors: Aymen Amine Assadi, Abdelkrim Bouzaza, Cédric Vallet, Dominique WolbertAbstract:Removal of Isovaleraldehyde from air was investigated experimentally by three processes: dielectric barrier discharge (DBD) plasma, photocatalysis and a DBD plasma/photocatalysis combination. The latter led to a synergetic effect. Many operating parameters were investigated in this study such as the specific energy of discharge, the inlet concentration of Isovaleraldehyde and the relative humidity. The UV light generated by the DBD plasma reactor did not activate the photocatalytic medium. Thus, its contribution to the removal of Isovaleraldehyde by photocatalysis could be ignored. On the other hand, the use of external UV light significantly improved the removal efficiency. Using a photocatalytic reactor in the presence of water vapor, in small amounts, had a promoting effect on the degradation due to the formation of OHradical dot radicals. The same phenomenon has been observed in other processes for small amounts of water in air. The identified and analyzed byproducts were classified into four groups: intermediate products (propionic acid, acetic acid and acetone), carbon monoxide, carbon dioxide and ozone. The carbon balance on carbon products was achieved at about 90%.
Abdelkrim Bouzaza - One of the best experts on this subject based on the ideXlab platform.
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Pilot scale degradation of mono and multi volatile organic compounds by surface discharge plasma/TiO reactor Investigation of competition and synergism
Journal of Hazardous Materials, 2018Co-Authors: Aymen Amine Assadi, Abdelkrim Bouzaza, Sivachandiran Loganathan, Phuong Nguyen Tri, Sara Gharib-abou Ghaida, Anh Nguyen Tuan, Dominique WolbertAbstract:This paper mainly deals with the Isovaleraldehyde degradation with the help of a nonthermal plasma surface discharge (NPSD) coupled with photocatalysis. The efficiency of NPSD reactor, for gas treatment, was studied for different binary mixtures (1) mixture of aldehydes (Isovaleraldehyde and Butyraldehyde) and (2) mixture of aldehyde and amine (Isovaleraldehyde and Trimethylamine). A planar continuous reactor is used to investigate the effect of addition of another pollutant on the performance of oxidation process. A synergetic effect was observed by combining NPSD and photocatalysis for the degradation of mixture of pollutants. In addition, combined NPSD/photocatalysis has significantly enhanced the CO selectivity, as compared to NPSD alone. This is attributed to the formation of more reactive species due to the presence of TiO in the plasma discharge zone. Moreover, ozone and UV light on TiO, produced by plasma, have activated the surface leading to enhanced mineralization. In addition, the byproducts of each binary mixture were identified and evaluated.
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Isovaleraldehyde degradation using UV photocatalytic and dielectric barrier discharge reactors, and their combinations
Journal of Photochemistry and Photobiology A: Chemistry, 2015Co-Authors: Jordi Palau, Aymen Amine Assadi, Josep Penya-roja, Abdelkrim Bouzaza, Dominique Wolbert, Vicente Martínez-soriaAbstract:The abatement of Isovaleraldehyde present in air was carried out in UV photocatalytic and dielectric barrier discharge reactors (and their combinations) for concentrations up to 150 mg C m−3 and air flow rates ranging from 4 to 10 m3 h−1. A kinetic study was performed following a Langmuir–Hinshelwood model. Photocatalytic treatment of an Isovaleraldehyde and isovaleric acid mixture showed a clear inhibition of isovaleric acid abatement in presence of Isovaleraldehyde. Dielectric barrier discharge treatment of Isovaleraldehyde showed an increase of removal efficiency with applied voltage and a decrease with air flow rate and inlet concentration. Moreover, introduction of a catalyst into the dielectric barrier discharge reactor did not produce a significant effect (UV light off). However, a combination of both techniques significantly increased Isovaleraldehyde removal efficiency, indicating the treatment technique sequence had an effect on system performance. In conclusion, combined treatment showed promising results for the removal of VOCs, providing a synergic improvement in the removal of Isovaleraldehyde.
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Treatment of gaseous effluents by using surface discharge plasma in continuous reactors: Process modelling and simulation
The Canadian Journal of Chemical Engineering, 2014Co-Authors: Aymen Amine Assadi, Abdelkrim Bouzaza, Dominique WolbertAbstract:In the present work, the oxidation of Isovaleraldehyde, a typical pollutant of indoor air, is investigated by using two different plasma DBD reactors: cylindrical and planar reactor. The study of the influence of the specific energy shows that its increment is accompanied by an increase of the removal efficiency. In fact, when specific energy extends three times, the removal efficiency is increased from 5 to 40 %. Moreover an increase of the specific energy induces a higher mineralization due to byproducts oxidation with reactive species production. The same behaviour is observed with ozone production. A generic mathematical model is developed to represent the experimental results obtained. This model is based on several mass transfer steps occurring in series between bulk and plasma phases. The degradation reaction mechanism is supposed to occur on two steps. Firstly, Isovaleraldehyde leads to the formation of a fictitious equivalent intermediate (EI). In a second step, EI is transformed into CO and CO2. This approach gives a good agreement between modelling and experiments with a satisfactory overall description of byproducts formation. This original approach allows for the simulation of plasma oxidation kinetics process without knowing the complete chemical pathway.
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use of dbd plasma photocatalysis and combined dbd plasma photocatalysis in a continuous annular reactor for Isovaleraldehyde elimination synergetic effect and byproducts identification
Chemical Engineering Journal, 2014Co-Authors: Aymen Amine Assadi, Abdelkrim Bouzaza, Cédric Vallet, Dominique WolbertAbstract:Removal of Isovaleraldehyde from air was investigated experimentally by three processes: dielectric barrier discharge (DBD) plasma, photocatalysis and a DBD plasma/photocatalysis combination. The latter led to a synergetic effect. Many operating parameters were investigated in this study such as the specific energy of discharge, the inlet concentration of Isovaleraldehyde and the relative humidity. The UV light generated by the DBD plasma reactor did not activate the photocatalytic medium. Thus, its contribution to the removal of Isovaleraldehyde by photocatalysis could be ignored. On the other hand, the use of external UV light significantly improved the removal efficiency. Using a photocatalytic reactor in the presence of water vapor, in small amounts, had a promoting effect on the degradation due to the formation of OHradical dot radicals. The same phenomenon has been observed in other processes for small amounts of water in air. The identified and analyzed byproducts were classified into four groups: intermediate products (propionic acid, acetic acid and acetone), carbon monoxide, carbon dioxide and ozone. The carbon balance on carbon products was achieved at about 90%.
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Use of DBD plasma, photocatalysis, and combined DBD plasma/photocatalysis in a continuous annular reactor for Isovaleraldehyde elimination - Synergetic effect and byproducts identification
The Chemical Engineering Journal, 2014Co-Authors: Aymen Amine Assadi, Abdelkrim Bouzaza, Cédric Vallet, Dominique WolbertAbstract:Removal of Isovaleraldehyde from air was investigated experimentally by three processes: dielectric barrier discharge (DBD) plasma, photocatalysis and a DBD plasma/photocatalysis combination. The latter led to a synergetic effect. Many operating parameters were investigated in this study such as the specific energy of discharge, the inlet concentration of Isovaleraldehyde and the relative humidity. The UV light generated by the DBD plasma reactor did not activate the photocatalytic medium. Thus, its contribution to the removal of Isovaleraldehyde by photocatalysis could be ignored. On the other hand, the use of external UV light significantly improved the removal efficiency. Using a photocatalytic reactor in the presence of water vapor, in small amounts, had a promoting effect on the degradation due to the formation of OHradical dot radicals. The same phenomenon has been observed in other processes for small amounts of water in air. The identified and analyzed byproducts were classified into four groups: intermediate products (propionic acid, acetic acid and acetone), carbon monoxide, carbon dioxide and ozone. The carbon balance on carbon products was achieved at about 90%.
Wolbert Dominique - One of the best experts on this subject based on the ideXlab platform.
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Pilot scale degradation of mono and multi volatile organic compounds by surface discharge plasma/TiO reactor Investigation of competition and synergism
'Elsevier BV', 2018Co-Authors: Assadi, Aymen Amine, Bouzaza Abdelkrim, Loganathan Sivachandiran, Tri, Phuong Nguyen, Gharib-abou Ghaida Sara, Tuan, Anh Nguyen, Wolbert DominiqueAbstract:International audienceThis paper mainly deals with the Isovaleraldehyde degradation with the help of a nonthermal plasma surface discharge (NPSD) coupled with photocatalysis. The efficiency of NPSD reactor, for gas treatment, was studied for different binary mixtures (1) mixture of aldehydes (Isovaleraldehyde and Butyraldehyde) and (2) mixture of aldehyde and amine (Isovaleraldehyde and Trimethylamine). A planar continuous reactor is used to investigate the effect of addition of another pollutant on the performance of oxidation process. A synergetic effect was observed by combining NPSD and photocatalysis for the degradation of mixture of pollutants. In addition, combined NPSD/photocatalysis has significantly enhanced the CO selectivity, as compared to NPSD alone. This is attributed to the formation of more reactive species due to the presence of TiO in the plasma discharge zone. Moreover, ozone and UV light on TiO, produced by plasma, have activated the surface leading to enhanced mineralization. In addition, the byproducts of each binary mixture were identified and evaluated
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Kinetic Modeling of VOC Photocatalytic Degradation Using a Process at Different Reactor Configurations and Scales
International Journal of Chemical Reactor Engineering, 2016Co-Authors: Aymen Amine Assadi, Bouzaza Abdelkrim, Wolbert DominiqueAbstract:AbstractThis work investigated the performance of Isovaleraldehyde (3-methylbutanal) removal from gas streams in photocatalytic reactors at room temperature. The feasibility of pollutant removal using the up-scaled reactor was systematically assessed by monitoring the removal efficiency at different operational parameters, such as geometries of reactor, air flow rate and inlet concentration. A proposal modeling for scaling up the photocatalytic reactors is described and detailed in this present study. In this context, the photocatalytic degradation of Isovaleraldehyde (Isoval) in gas phase is studied. In fact, the removal rate has been compared at different continuous flow reactors: a photocatalytic tangential reactor (PTR), planar reactor and P5000 pilot. The effects of the inlet concentration, flow rate, geometries and size of reactors on the removal efficiency are also studied. A kinetic model taking into account the mass transfer step is developed. The modeling is done by introducing an equivalent intermediate (EI) formed by the photo-oxidation of Isoval. This new approach has substantially improved the agreement between modeling and experiments with a satisfactory overall description of the mineralization from lab to pilot scales.
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Kinetic Modeling of VOC Photocatalytic Degradation Using a Process at Different Reactor Configurations and Scales
'Walter de Gruyter GmbH', 2016Co-Authors: Assadi, Aymen Amine, Bouzaza Abdelkrim, Wolbert DominiqueAbstract:International audienceThis work investigated the performance of Isovaleraldehyde (3-methylbutanal) removal from gas streams in photocatalytic reactors at room temperature. The feasibility of pollutant removal using the up-scaled reactor was systematically assessed by monitoring the removal efficiency at different operational parameters, such as geometries of reactor, air flow rate and inlet concentration. A proposal modeling for scaling up the photocatalytic reactors is described and detailed in this present study. In this context, the photocatalytic degradation of Isovaleraldehyde (Isoval) in gas phase is studied. In fact, the removal rate has been compared at different continuous flow reactors: a photocatalytic tangential reactor (PTR), planar reactor and P5000 pilot. The effects of the inlet concentration, flow rate, geometries and size of reactors on the removal efficiency are also studied. A kinetic model taking into account the mass transfer step is developed. The modeling is done by introducing an equivalent intermediate (EI) formed by the photo-oxidation of Isoval. This new approach has substantially improved the agreement between modeling and experiments with a satisfactory overall description of the mineralization from lab to pilot scales
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Isovaleraldehyde degradation using UV photocatalytic and dielectric barrier discharge reactors, and their combinations
'Elsevier BV', 2015Co-Authors: Palau Jordi, Assadi, Aymen Amine, Penya-roja Josep, Bouzaza Abdelkrim, Wolbert Dominique, Martínez-soria VicenteAbstract:International audienceThe abatement of Isovaleraldehyde present in air was carried out in UV photocatalytic and dielectric barrier discharge reactors (and their combinations) for concentrations up to 150 mg C m−3 and air flow rates ranging from 4 to 10 m3 h−1. A kinetic study was performed following a Langmuir–Hinshelwood model. Photocatalytic treatment of an Isovaleraldehyde and isovaleric acid mixture showed a clear inhibition of isovaleric acid abatement in presence of Isovaleraldehyde. Dielectric barrier discharge treatment of Isovaleraldehyde showed an increase of removal efficiency with applied voltage and a decrease with air flow rate and inlet concentration. Moreover, introduction of a catalyst into the dielectric barrier discharge reactor did not produce a significant effect (UV light off). However, a combination of both techniques significantly increased Isovaleraldehyde removal efficiency, indicating the treatment technique sequence had an effect on system performance. In conclusion, combined treatment showed promising results for the removal of VOCs, providing a synergic improvement in the removal of Isovaleraldehyde
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Treatment of gaseous effluents by using surface discharge plasma in continuous reactors: Process modelling and simulation
'Wiley', 2015Co-Authors: Assadi Aymen, Bouzaza Abdelkrim, Wolbert DominiqueAbstract:International audienceIn the present work, the oxidation of Isovaleraldehyde, a typical pollutant of indoor air, is investigated by using two different plasma DBD reactors: cylindrical and planar reactor. The study of the influence of the specific energy shows that its increment is accompanied by an increase of the removal efficiency. In fact, when specific energy extends three times, the removal efficiency is increased from 5 to 40%. Moreover an increase of the specific energy induces a higher mineralization due to byproducts oxidation with reactive species production. The same behavior is observed with ozone production. A generic mathematical model is developed to represent the experimental results obtained. This model is based on several mass transfer steps occurring in series between bulk and plasma phases. The degradation reaction mechanism is supposed to occur on two steps. Firstly, Isovaleraldehyde leads to the formation of a fictitious equivalent intermediate (EI). In a second step, EI is transformed into CO and CO2. This approach gives a good agreement between modeling and experiments with a satisfactory overall description of byproducts formation. This original approach allows for the simulation of plasma oxidation kinetics process without knowing the complete chemical pathway
Bouzaza Abdelkrim - One of the best experts on this subject based on the ideXlab platform.
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Pilot scale degradation of mono and multi volatile organic compounds by surface discharge plasma/TiO reactor Investigation of competition and synergism
'Elsevier BV', 2018Co-Authors: Assadi, Aymen Amine, Bouzaza Abdelkrim, Loganathan Sivachandiran, Tri, Phuong Nguyen, Gharib-abou Ghaida Sara, Tuan, Anh Nguyen, Wolbert DominiqueAbstract:International audienceThis paper mainly deals with the Isovaleraldehyde degradation with the help of a nonthermal plasma surface discharge (NPSD) coupled with photocatalysis. The efficiency of NPSD reactor, for gas treatment, was studied for different binary mixtures (1) mixture of aldehydes (Isovaleraldehyde and Butyraldehyde) and (2) mixture of aldehyde and amine (Isovaleraldehyde and Trimethylamine). A planar continuous reactor is used to investigate the effect of addition of another pollutant on the performance of oxidation process. A synergetic effect was observed by combining NPSD and photocatalysis for the degradation of mixture of pollutants. In addition, combined NPSD/photocatalysis has significantly enhanced the CO selectivity, as compared to NPSD alone. This is attributed to the formation of more reactive species due to the presence of TiO in the plasma discharge zone. Moreover, ozone and UV light on TiO, produced by plasma, have activated the surface leading to enhanced mineralization. In addition, the byproducts of each binary mixture were identified and evaluated
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Kinetic Modeling of VOC Photocatalytic Degradation Using a Process at Different Reactor Configurations and Scales
International Journal of Chemical Reactor Engineering, 2016Co-Authors: Aymen Amine Assadi, Bouzaza Abdelkrim, Wolbert DominiqueAbstract:AbstractThis work investigated the performance of Isovaleraldehyde (3-methylbutanal) removal from gas streams in photocatalytic reactors at room temperature. The feasibility of pollutant removal using the up-scaled reactor was systematically assessed by monitoring the removal efficiency at different operational parameters, such as geometries of reactor, air flow rate and inlet concentration. A proposal modeling for scaling up the photocatalytic reactors is described and detailed in this present study. In this context, the photocatalytic degradation of Isovaleraldehyde (Isoval) in gas phase is studied. In fact, the removal rate has been compared at different continuous flow reactors: a photocatalytic tangential reactor (PTR), planar reactor and P5000 pilot. The effects of the inlet concentration, flow rate, geometries and size of reactors on the removal efficiency are also studied. A kinetic model taking into account the mass transfer step is developed. The modeling is done by introducing an equivalent intermediate (EI) formed by the photo-oxidation of Isoval. This new approach has substantially improved the agreement between modeling and experiments with a satisfactory overall description of the mineralization from lab to pilot scales.
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Kinetic Modeling of VOC Photocatalytic Degradation Using a Process at Different Reactor Configurations and Scales
'Walter de Gruyter GmbH', 2016Co-Authors: Assadi, Aymen Amine, Bouzaza Abdelkrim, Wolbert DominiqueAbstract:International audienceThis work investigated the performance of Isovaleraldehyde (3-methylbutanal) removal from gas streams in photocatalytic reactors at room temperature. The feasibility of pollutant removal using the up-scaled reactor was systematically assessed by monitoring the removal efficiency at different operational parameters, such as geometries of reactor, air flow rate and inlet concentration. A proposal modeling for scaling up the photocatalytic reactors is described and detailed in this present study. In this context, the photocatalytic degradation of Isovaleraldehyde (Isoval) in gas phase is studied. In fact, the removal rate has been compared at different continuous flow reactors: a photocatalytic tangential reactor (PTR), planar reactor and P5000 pilot. The effects of the inlet concentration, flow rate, geometries and size of reactors on the removal efficiency are also studied. A kinetic model taking into account the mass transfer step is developed. The modeling is done by introducing an equivalent intermediate (EI) formed by the photo-oxidation of Isoval. This new approach has substantially improved the agreement between modeling and experiments with a satisfactory overall description of the mineralization from lab to pilot scales
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Isovaleraldehyde degradation using UV photocatalytic and dielectric barrier discharge reactors, and their combinations
'Elsevier BV', 2015Co-Authors: Palau Jordi, Assadi, Aymen Amine, Penya-roja Josep, Bouzaza Abdelkrim, Wolbert Dominique, Martínez-soria VicenteAbstract:International audienceThe abatement of Isovaleraldehyde present in air was carried out in UV photocatalytic and dielectric barrier discharge reactors (and their combinations) for concentrations up to 150 mg C m−3 and air flow rates ranging from 4 to 10 m3 h−1. A kinetic study was performed following a Langmuir–Hinshelwood model. Photocatalytic treatment of an Isovaleraldehyde and isovaleric acid mixture showed a clear inhibition of isovaleric acid abatement in presence of Isovaleraldehyde. Dielectric barrier discharge treatment of Isovaleraldehyde showed an increase of removal efficiency with applied voltage and a decrease with air flow rate and inlet concentration. Moreover, introduction of a catalyst into the dielectric barrier discharge reactor did not produce a significant effect (UV light off). However, a combination of both techniques significantly increased Isovaleraldehyde removal efficiency, indicating the treatment technique sequence had an effect on system performance. In conclusion, combined treatment showed promising results for the removal of VOCs, providing a synergic improvement in the removal of Isovaleraldehyde
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Treatment of gaseous effluents by using surface discharge plasma in continuous reactors: Process modelling and simulation
'Wiley', 2015Co-Authors: Assadi Aymen, Bouzaza Abdelkrim, Wolbert DominiqueAbstract:International audienceIn the present work, the oxidation of Isovaleraldehyde, a typical pollutant of indoor air, is investigated by using two different plasma DBD reactors: cylindrical and planar reactor. The study of the influence of the specific energy shows that its increment is accompanied by an increase of the removal efficiency. In fact, when specific energy extends three times, the removal efficiency is increased from 5 to 40%. Moreover an increase of the specific energy induces a higher mineralization due to byproducts oxidation with reactive species production. The same behavior is observed with ozone production. A generic mathematical model is developed to represent the experimental results obtained. This model is based on several mass transfer steps occurring in series between bulk and plasma phases. The degradation reaction mechanism is supposed to occur on two steps. Firstly, Isovaleraldehyde leads to the formation of a fictitious equivalent intermediate (EI). In a second step, EI is transformed into CO and CO2. This approach gives a good agreement between modeling and experiments with a satisfactory overall description of byproducts formation. This original approach allows for the simulation of plasma oxidation kinetics process without knowing the complete chemical pathway
