The Experts below are selected from a list of 597 Experts worldwide ranked by ideXlab platform
Daiviet N Vo - One of the best experts on this subject based on the ideXlab platform.
-
Evaluation of Co-promoted Ni/Al2O3 Catalyst for CO2 Reforming of Ethanol
2020Co-Authors: Bahari Mahadi, Fahim Fayaz, Nguyen Huu Huy Phuc, Fiona-ling W. Ming, Ainirazali Nurul, Daiviet N VoAbstract:The performance of Co-promoted Ni/Al2O3 catalyst prepared by co-impregnation method has been investigated for Syngas Generation through ethanol dry reforming in a tubular fixed-bed reactor at 973 K and various partial pressures of reactants. Both γ-Al2O3 support and 3%Co-10%Ni/Al2O3 catalyst exhibited high surface area of 174.13 and 89.15 m2 g-1, respectively. Temperature-programmed calcination and XRD measurements detected the formation of NiO, Co3O4, NiAl2O4 and CoAl2O4 phases on catalyst surface. In addition, the activation energy for the formation of these phases varied from 148.5 to 296.5 kJ mol-1. The conversion of both C2H5OH and CO2 was stable with time-on-stream at beyond 6 h. An increase in CO2 partial pressure enhanced the selectivity of H2 and CO but decreased CH4 selectivity due to the dry reforming reaction of CH4 intermediate product. The optimal C2H5OH partial pressure was obtained at 30 kPa in terms of H2 and CO yield.
-
stability evaluation of ethanol dry reforming on lanthania doped cobalt based catalysts for hydrogen rich Syngas Generation
International Journal of Energy Research, 2019Co-Authors: Fahim Fayaz, Mahadi B Bahari, Chanatip Samart, Long Giang Bach, Trinh Duy Nguyen, Khanh B Vu, Ramesh Kanthasamy, Chinh Nguyenhuy, Daiviet N VoAbstract:Catalytic stability with time‐on‐stream is an important aspect in ethanol dry reforming (EDR) since catalysts could encounter undesirable deterioration arising from deposited carbon. This work examined the promotional effect of La on 10%Co/Al2O3 in terms of activity, stability, and characteristics. Catalysts were characterized by X‐ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), Raman, and X‐ray photoelectron spectroscopy (XPS) measurements whilst catalytic EDR performance of La‐promoted and unpromoted 10%Co/Al2O3 prepared via wet impregnation technique was investigated at 973 K for 72 h using a stoichiometric feed ratio (C2H5OH/CO2 = 1/1). La promoter substantially enhanced both metal dispersion and metal surface area from 0.11% to 0.64% and 0.08 to 0.43 m2 g−1, respectively. Ethanol and CO2 conversions appeared to be stable within 50 to 72 h after experiencing an initial activity drop. The conversion of C2H5OH and CO2 for La‐promoted catalyst was about 1.65 and 1.34 times greater than unpromoted counterpart in this order. The carbonaceous deposition was considerably decreased from 55.6% to 36.8% with La promotion due to La2O2CO3 intermediate formation. Additionally, 3%La‐10%Co/Al2O3 possessed greater oxygen vacancies acting as active sites for CO2adsorption and hence increasing carbon gasification. Even though graphitic and filamentous carbons were formed on used catalyst surface, La‐addition diminished graphite formation and increased the reactiveness of amorphous carbon.
-
ethylene glycol dry reforming on ni al2o3 catalyst for Syngas Generation
IOP Conference Series: Materials Science and Engineering, 2018Co-Authors: Mahadi B Bahari, Mohd Nasir Nor Shafiqah, Fahim Fayaz, Daiviet N VoAbstract:It is the first time ethylene glycol dry reforming (EGDR) reaction was carried out for Syngas production on 10%Ni/Al2O3 catalyst in a tubular fixed-bed reactor at atmospheric condition. Wet-impregnation method was employed for the synthesis of 10%Ni/Al2O3 catalyst. The results of X-ray diffraction measurement revealed the presence of γ-Al2O3, NiO, NiAl2O4, Ni0 and graphitic carbon phases on the surface of spent 10%Ni/Al2O3 catalyst. H2 temperature-programmed reduction indicates that NiO and NiAl2O4 phases were totally reduced to metallic nickel phase at reduction temperature above 970 K. EGDR activity appeared to be steady with time-on-stream beyond 5-7 h. Catalytic activity was considerably improved with increasing feed ratio of CO2:C2H6O2 from 1:1 to 2.5:1.
-
ethylene glycol dry reforming for Syngas Generation on ce promoted co al2o3 catalysts
Applied Petrochemical Research, 2018Co-Authors: Mahadi B Bahari, Bawadi Abdullah, Pham T. T. Phuong, Nguyen Huu Huy Phuc, Chanatip Samart, H. D. Setiabudi, Daiviet N VoAbstract:Ethylene glycol dry reforming (EGDR) was investigated for the first time on 10% Co/Al2O3 and 3% Ce–10% Co/Al2O3 catalysts at stoichiometric feed composition under atmospheric pressure and 923–998 K for Syngas production. Catalysts were characterized using BET, H2-TPR, XRD and Raman spectroscopy measurements. The addition of Ce promoter eased the reduction of Co3O4 with lower reduction temperature and enhanced metal dispersion. Ce promotion also improved EGDR performance by increasing reactant conversions, Syngas yields and reducing undesirable methane formation. The conversion of ethylene glycol and H2 yield reached up to 71.7% and 69.3%, respectively.
-
Ethylene glycol dry reforming for Syngas Generation on Ce-promoted Co/Al_2O_3 catalysts
Applied Petrochemical Research, 2018Co-Authors: Mahadi B Bahari, Bawadi Abdullah, Pham T. T. Phuong, Nguyen Huu Huy Phuc, Chanatip Samart, H. D. Setiabudi, Daiviet N VoAbstract:Ethylene glycol dry reforming (EGDR) was investigated for the first time on 10% Co/Al_2O_3 and 3% Ce–10% Co/Al_2O_3 catalysts at stoichiometric feed composition under atmospheric pressure and 923–998 K for Syngas production. Catalysts were characterized using BET, H_2-TPR, XRD and Raman spectroscopy measurements. The addition of Ce promoter eased the reduction of Co_3O_4 with lower reduction temperature and enhanced metal dispersion. Ce promotion also improved EGDR performance by increasing reactant conversions, Syngas yields and reducing undesirable methane formation. The conversion of ethylene glycol and H_2 yield reached up to 71.7% and 69.3%, respectively.
Mahadi B Bahari - One of the best experts on this subject based on the ideXlab platform.
-
stability evaluation of ethanol dry reforming on lanthania doped cobalt based catalysts for hydrogen rich Syngas Generation
International Journal of Energy Research, 2019Co-Authors: Fahim Fayaz, Mahadi B Bahari, Chanatip Samart, Long Giang Bach, Trinh Duy Nguyen, Khanh B Vu, Ramesh Kanthasamy, Chinh Nguyenhuy, Daiviet N VoAbstract:Catalytic stability with time‐on‐stream is an important aspect in ethanol dry reforming (EDR) since catalysts could encounter undesirable deterioration arising from deposited carbon. This work examined the promotional effect of La on 10%Co/Al2O3 in terms of activity, stability, and characteristics. Catalysts were characterized by X‐ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), Raman, and X‐ray photoelectron spectroscopy (XPS) measurements whilst catalytic EDR performance of La‐promoted and unpromoted 10%Co/Al2O3 prepared via wet impregnation technique was investigated at 973 K for 72 h using a stoichiometric feed ratio (C2H5OH/CO2 = 1/1). La promoter substantially enhanced both metal dispersion and metal surface area from 0.11% to 0.64% and 0.08 to 0.43 m2 g−1, respectively. Ethanol and CO2 conversions appeared to be stable within 50 to 72 h after experiencing an initial activity drop. The conversion of C2H5OH and CO2 for La‐promoted catalyst was about 1.65 and 1.34 times greater than unpromoted counterpart in this order. The carbonaceous deposition was considerably decreased from 55.6% to 36.8% with La promotion due to La2O2CO3 intermediate formation. Additionally, 3%La‐10%Co/Al2O3 possessed greater oxygen vacancies acting as active sites for CO2adsorption and hence increasing carbon gasification. Even though graphitic and filamentous carbons were formed on used catalyst surface, La‐addition diminished graphite formation and increased the reactiveness of amorphous carbon.
-
ethylene glycol dry reforming on ni al2o3 catalyst for Syngas Generation
IOP Conference Series: Materials Science and Engineering, 2018Co-Authors: Mahadi B Bahari, Mohd Nasir Nor Shafiqah, Fahim Fayaz, Daiviet N VoAbstract:It is the first time ethylene glycol dry reforming (EGDR) reaction was carried out for Syngas production on 10%Ni/Al2O3 catalyst in a tubular fixed-bed reactor at atmospheric condition. Wet-impregnation method was employed for the synthesis of 10%Ni/Al2O3 catalyst. The results of X-ray diffraction measurement revealed the presence of γ-Al2O3, NiO, NiAl2O4, Ni0 and graphitic carbon phases on the surface of spent 10%Ni/Al2O3 catalyst. H2 temperature-programmed reduction indicates that NiO and NiAl2O4 phases were totally reduced to metallic nickel phase at reduction temperature above 970 K. EGDR activity appeared to be steady with time-on-stream beyond 5-7 h. Catalytic activity was considerably improved with increasing feed ratio of CO2:C2H6O2 from 1:1 to 2.5:1.
-
ethylene glycol dry reforming for Syngas Generation on ce promoted co al2o3 catalysts
Applied Petrochemical Research, 2018Co-Authors: Mahadi B Bahari, Bawadi Abdullah, Pham T. T. Phuong, Nguyen Huu Huy Phuc, Chanatip Samart, H. D. Setiabudi, Daiviet N VoAbstract:Ethylene glycol dry reforming (EGDR) was investigated for the first time on 10% Co/Al2O3 and 3% Ce–10% Co/Al2O3 catalysts at stoichiometric feed composition under atmospheric pressure and 923–998 K for Syngas production. Catalysts were characterized using BET, H2-TPR, XRD and Raman spectroscopy measurements. The addition of Ce promoter eased the reduction of Co3O4 with lower reduction temperature and enhanced metal dispersion. Ce promotion also improved EGDR performance by increasing reactant conversions, Syngas yields and reducing undesirable methane formation. The conversion of ethylene glycol and H2 yield reached up to 71.7% and 69.3%, respectively.
-
Ethylene glycol dry reforming for Syngas Generation on Ce-promoted Co/Al_2O_3 catalysts
Applied Petrochemical Research, 2018Co-Authors: Mahadi B Bahari, Bawadi Abdullah, Pham T. T. Phuong, Nguyen Huu Huy Phuc, Chanatip Samart, H. D. Setiabudi, Daiviet N VoAbstract:Ethylene glycol dry reforming (EGDR) was investigated for the first time on 10% Co/Al_2O_3 and 3% Ce–10% Co/Al_2O_3 catalysts at stoichiometric feed composition under atmospheric pressure and 923–998 K for Syngas production. Catalysts were characterized using BET, H_2-TPR, XRD and Raman spectroscopy measurements. The addition of Ce promoter eased the reduction of Co_3O_4 with lower reduction temperature and enhanced metal dispersion. Ce promotion also improved EGDR performance by increasing reactant conversions, Syngas yields and reducing undesirable methane formation. The conversion of ethylene glycol and H_2 yield reached up to 71.7% and 69.3%, respectively.
-
Stability evaluation of ethanol dry reforming on Lanthania‐doped cobalt‐based catalysts for hydrogen‐rich Syngas Generation
International Journal of Energy Research, 2018Co-Authors: Fahim Fayaz, Mahadi B Bahari, Chanatip Samart, Long Giang Bach, Trinh Duy Nguyen, Khanh B Vu, Ramesh Kanthasamy, Chinh Nguyen-huy, Daiviet N VoAbstract:Catalytic stability with time‐on‐stream is an important aspect in ethanol dry reforming (EDR) since catalysts could encounter undesirable deterioration arising from deposited carbon. This work examined the promotional effect of La on 10%Co/Al2O3 in terms of activity, stability, and characteristics. Catalysts were characterized by X‐ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), Raman, and X‐ray photoelectron spectroscopy (XPS) measurements whilst catalytic EDR performance of La‐promoted and unpromoted 10%Co/Al2O3 prepared via wet impregnation technique was investigated at 973 K for 72 h using a stoichiometric feed ratio (C2H5OH/CO2 = 1/1). La promoter substantially enhanced both metal dispersion and metal surface area from 0.11% to 0.64% and 0.08 to 0.43 m2 g−1, respectively. Ethanol and CO2 conversions appeared to be stable within 50 to 72 h after experiencing an initial activity drop. The conversion of C2H5OH and CO2 for La‐promoted catalyst was about 1.65 and 1.34 times greater than unpromoted counterpart in this order. The carbonaceous deposition was considerably decreased from 55.6% to 36.8% with La promotion due to La2O2CO3 intermediate formation. Additionally, 3%La‐10%Co/Al2O3 possessed greater oxygen vacancies acting as active sites for CO2adsorption and hence increasing carbon gasification. Even though graphitic and filamentous carbons were formed on used catalyst surface, La‐addition diminished graphite formation and increased the reactiveness of amorphous carbon.
Satyanarayana Chilukuri - One of the best experts on this subject based on the ideXlab platform.
-
tuning the dimensionality of layered srn 1tin xnixo3n 1 perovskite structures for improved activity in Syngas Generation
Journal of Catalysis, 2018Co-Authors: Srikanth Dama, Seema R Ghodke, Richa Bobade, Hanmant R Gurav, Satyanarayana ChilukuriAbstract:Abstract Interest in perovskite type oxides is growing due to their versatile catalytic applications. A series of Ruddlesden-Popper (RP) type layered perovskite oxides Srn+1Tin−xNixO3n+1 were prepared and evaluated for their catalytic activity in steam reforming, CO2 reforming and bi-reforming of methane. These materials, prepared through citrate gel method were characterized to understand their structure and Ni reducibility. Substitution of Ni in RP phases was established through refinement of XRD powder pattern. During methane reforming, the catalytic activity increased with the order of RP phase of SrTi1−xNixO3−δ (n = ∞). TPR results show variation in Ni reducibility with the order of RP phase, while TPD-O2 study helped to estimate oxygen vacancies. These vacancies seem to influence catalytic activity during methane reforming. Transient pulse experiments show that CO2 dissociates over oxygen vacancies to give CO and oxygen, with later replenishing lattice oxygen in SrTi0.8Ni0.2O3−δ (n = ∞) phases. Highly labile oxygen vacancies generated in the bulk of SrTi0.8Ni0.2O3−δ must be migrating to the surface, helping in the removal of coke formed. Characterization of catalysts after reaction helped in better understanding of coke precursors.
-
Tuning the dimensionality of layered Srn+1Tin−xNixO3n+1 perovskite structures for improved activity in Syngas Generation
Journal of Catalysis, 2018Co-Authors: Srikanth Dama, Seema R Ghodke, Richa Bobade, Hanmant R Gurav, Satyanarayana ChilukuriAbstract:Abstract Interest in perovskite type oxides is growing due to their versatile catalytic applications. A series of Ruddlesden-Popper (RP) type layered perovskite oxides Srn+1Tin−xNixO3n+1 were prepared and evaluated for their catalytic activity in steam reforming, CO2 reforming and bi-reforming of methane. These materials, prepared through citrate gel method were characterized to understand their structure and Ni reducibility. Substitution of Ni in RP phases was established through refinement of XRD powder pattern. During methane reforming, the catalytic activity increased with the order of RP phase of SrTi1−xNixO3−δ (n = ∞). TPR results show variation in Ni reducibility with the order of RP phase, while TPD-O2 study helped to estimate oxygen vacancies. These vacancies seem to influence catalytic activity during methane reforming. Transient pulse experiments show that CO2 dissociates over oxygen vacancies to give CO and oxygen, with later replenishing lattice oxygen in SrTi0.8Ni0.2O3−δ (n = ∞) phases. Highly labile oxygen vacancies generated in the bulk of SrTi0.8Ni0.2O3−δ must be migrating to the surface, helping in the removal of coke formed. Characterization of catalysts after reaction helped in better understanding of coke precursors.
Fanhe Kong - One of the best experts on this subject based on the ideXlab platform.
-
high pressure chemical looping reforming processes system analysis for Syngas Generation from natural gas and reducing tail gases
Energy & Fuels, 2018Co-Authors: Peter Sandvik, Mandar Kathe, William K Wang, Fanhe KongAbstract:Reforming technologies produce Syngas that serves as an important intermediate in the production of fuels and chemicals in the chemical and petrochemical industry. Only recently has reforming technology based on the chemical looping concept been attempted. Most chemical looping studies have been performed under ambient pressure conditions, but most processes that use Syngas operate at an elevated pressure. Understanding the effect that pressure has on Syngas Generation in a chemical looping reactor is essential to the design of the overall system. This study characterizes and compares the effect of pressures on Syngas yields under various chemical looping reforming operating conditions. Specifically, in this study, an iron-based oxygen carrier is used for the chemical looping partial oxidation reaction of methane to form Syngas. The equilibrium simulation is of direct relevance to process applications, as demonstrated by the methane and metal oxide co-current reactor system, where in previous studies, exp...
-
High-Pressure Chemical Looping Reforming Processes: System Analysis for Syngas Generation from Natural Gas and Reducing Tail Gases
Energy and Fuels, 2018Co-Authors: Peter Sandvik, Mandar Kathe, Fanhe Kong, William Yi Wang, Liang-shih. FanAbstract:© 2018 American Chemical Society. Reforming technologies produce Syngas that serves as an important intermediate in the production of fuels and chemicals in the chemical and petrochemical industry. Only recently has reforming technology based on the chemical looping concept been attempted. Most chemical looping studies have been performed under ambient pressure conditions, but most processes that use Syngas operate at an elevated pressure. Understanding the effect that pressure has on Syngas Generation in a chemical looping reactor is essential to the design of the overall system. This study characterizes and compares the effect of pressures on Syngas yields under various chemical looping reforming operating conditions. Specifically, in this study, an iron-based oxygen carrier is used for the chemical looping partial oxidation reaction of methane to form Syngas. The equilibrium simulation is of direct relevance to process applications, as demonstrated by the methane and metal oxide co-current reactor system, where in previous studies, experimental product yields were shown to be appropriately represented by equilibrium conditions. The results of Syngas Generation at 1 atm are used in this study as the basis for comparison to those obtained under pressurized conditions. The isothermal Syngas Generation is first examined qualitatively and quantitatively for pressures ranging from 1 to 30 atm. The adiabatic Syngas Generation is then examined under autothermal operating conditions. The sensitivity studies are performed to describe the changes in product yields as the temperature and pressure along with steam and CO2 inputs are varied. The results of the analysis illustrate the various competing factors that dictate the high-pressure Syngas yield and purity. The study also provides insight into choice of operating conditions that enable thermodynamic Syngas yields at higher pressure to be comparable to those at atmospheric pressures.
-
modularization strategy for Syngas Generation in chemical looping methane reforming systems with co2 as feedstock
Aiche Journal, 2017Co-Authors: Mandar Kathe, Peter Sandvik, Fanhe Kong, Charles Fryer, Yitao Zhang, Abbey EmpfieldAbstract:This study considers a CO2 feedstock in conventional methane reforming processes and metal oxide lattice oxygen based chemical looping reforming. Lattice oxygen from iron-titanium composite metal oxide provides the most efficient co-utilization of CO2 with CH4. A modularization chemical looping strategy is developed to further improve process efficiencies using a thermodynamic rationale. Modularization leverages the ability of two or more reactors operating in parallel to produce a higher quality Syngas than a single reactor operating alone while offering a direct solution to scale up of multiple parallel reactor processes. Experiments conducted validate the thermodynamic simulation results. Simulation and experimental results ascertain that a cocurrent moving bed in a modularization system can operate under CO2 neutral or negative conditions. The results for a modularization process system for 7950 m3 per day (50,000 barrels per day) of liquid fuel indicate a ∼23% reduction of natural gas usage over baseline-case. © 2017 American Institute of Chemical Engineers AIChE J, 63: 3343–3360, 2017
Peter Sandvik - One of the best experts on this subject based on the ideXlab platform.
-
high pressure chemical looping reforming processes system analysis for Syngas Generation from natural gas and reducing tail gases
Energy & Fuels, 2018Co-Authors: Peter Sandvik, Mandar Kathe, William K Wang, Fanhe KongAbstract:Reforming technologies produce Syngas that serves as an important intermediate in the production of fuels and chemicals in the chemical and petrochemical industry. Only recently has reforming technology based on the chemical looping concept been attempted. Most chemical looping studies have been performed under ambient pressure conditions, but most processes that use Syngas operate at an elevated pressure. Understanding the effect that pressure has on Syngas Generation in a chemical looping reactor is essential to the design of the overall system. This study characterizes and compares the effect of pressures on Syngas yields under various chemical looping reforming operating conditions. Specifically, in this study, an iron-based oxygen carrier is used for the chemical looping partial oxidation reaction of methane to form Syngas. The equilibrium simulation is of direct relevance to process applications, as demonstrated by the methane and metal oxide co-current reactor system, where in previous studies, exp...
-
High-Pressure Chemical Looping Reforming Processes: System Analysis for Syngas Generation from Natural Gas and Reducing Tail Gases
Energy and Fuels, 2018Co-Authors: Peter Sandvik, Mandar Kathe, Fanhe Kong, William Yi Wang, Liang-shih. FanAbstract:© 2018 American Chemical Society. Reforming technologies produce Syngas that serves as an important intermediate in the production of fuels and chemicals in the chemical and petrochemical industry. Only recently has reforming technology based on the chemical looping concept been attempted. Most chemical looping studies have been performed under ambient pressure conditions, but most processes that use Syngas operate at an elevated pressure. Understanding the effect that pressure has on Syngas Generation in a chemical looping reactor is essential to the design of the overall system. This study characterizes and compares the effect of pressures on Syngas yields under various chemical looping reforming operating conditions. Specifically, in this study, an iron-based oxygen carrier is used for the chemical looping partial oxidation reaction of methane to form Syngas. The equilibrium simulation is of direct relevance to process applications, as demonstrated by the methane and metal oxide co-current reactor system, where in previous studies, experimental product yields were shown to be appropriately represented by equilibrium conditions. The results of Syngas Generation at 1 atm are used in this study as the basis for comparison to those obtained under pressurized conditions. The isothermal Syngas Generation is first examined qualitatively and quantitatively for pressures ranging from 1 to 30 atm. The adiabatic Syngas Generation is then examined under autothermal operating conditions. The sensitivity studies are performed to describe the changes in product yields as the temperature and pressure along with steam and CO2 inputs are varied. The results of the analysis illustrate the various competing factors that dictate the high-pressure Syngas yield and purity. The study also provides insight into choice of operating conditions that enable thermodynamic Syngas yields at higher pressure to be comparable to those at atmospheric pressures.
-
modularization strategy for Syngas Generation in chemical looping methane reforming systems with co2 as feedstock
Aiche Journal, 2017Co-Authors: Mandar Kathe, Peter Sandvik, Fanhe Kong, Charles Fryer, Yitao Zhang, Abbey EmpfieldAbstract:This study considers a CO2 feedstock in conventional methane reforming processes and metal oxide lattice oxygen based chemical looping reforming. Lattice oxygen from iron-titanium composite metal oxide provides the most efficient co-utilization of CO2 with CH4. A modularization chemical looping strategy is developed to further improve process efficiencies using a thermodynamic rationale. Modularization leverages the ability of two or more reactors operating in parallel to produce a higher quality Syngas than a single reactor operating alone while offering a direct solution to scale up of multiple parallel reactor processes. Experiments conducted validate the thermodynamic simulation results. Simulation and experimental results ascertain that a cocurrent moving bed in a modularization system can operate under CO2 neutral or negative conditions. The results for a modularization process system for 7950 m3 per day (50,000 barrels per day) of liquid fuel indicate a ∼23% reduction of natural gas usage over baseline-case. © 2017 American Institute of Chemical Engineers AIChE J, 63: 3343–3360, 2017
