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Yann Rogaume - One of the best experts on this subject based on the ideXlab platform.
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Kinetic Study of Low Density Polyethylene Using Thermogravimetric Analysis, Part 2: Isothermal Study
Waste and Biomass Valorization, 2017Co-Authors: Melhyas Kple, Malahimi Anjorin, Benoît Fagla, Isabelle Ziegler-devin, Pierre Girods, Yann RogaumeAbstract:Thermal behavior of plastic materials can be improved by knowing thermal degradation Kinetics for the optimal design and operation of pyrolysis process. In continuity of part 1 of the present Study, Thermogravimetric analysis has been used for isothermal Kinetic Study of waste Low-Density Polyethylene (LDPE) pyrolysis under Argon atmosphere at different temperatures 420, 430, 440, 450, 460 and 470 °C. These isotherms were chosen after determining the range of thermal degradation of LDPE using Thermogravimetric analysis in non-isothermal conditions. This work aims to analyze the applicability of simples Kinetic models to the prediction of the thermal behavior of the material, taking into account the complex chain reaction mechanism. Because of this complex reaction mechanism, the reaction order of pyrolysis of LDPE was determined. Freidman method has been used to obtain the activation energy and the frequency factor from isothermal experiments and compare them with the values obtained from non-isothermal experiments obtained in part 1 and with the results obtained by other authors.
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Thermal Degradation of Household Solid Waste in the Town of Abomey-Calavi in Benin: Kinetic Study
Waste and Biomass Valorization, 2016Co-Authors: Melhyas Kple, Malahimi Anjorin, Benoît Fagla, Pierre Girods, Yann RogaumeAbstract:Thermal behavior of household waste can be improved by knowing thermal degradation Kinetics for the optimal design and operation of pyrolysis process. In the present Study, Thermogravimetric analysis has been used for dynamic Kinetic Study of pyrolysis of waste cardboard, wood, and household waste of Abomey-Calavi city in Benin under Argon atmosphere at different heating rates 5–50 °C min^−1. For facilitating the laboratory Study of household, a model waste (MW) based on wood (88 %), cardboard (7 %) and plastic (5 %) was developed. The Kinetic of model waste was studied with Friedman isoconversional method. The thermal degradation of MW is processed in two steps: the first step between 200 and 400 °C and second step between 400 and 600 °C. The difference of mass loss between experimental and theoretical ones (calculated as arithmetic sums of those from each separated component) was used as a criterion of synergetic effect. The experimental results indicated that a low synergetic effect existed between plastic and cellulosic materials during the pyrolysis of MW. Based on TG and DTG data with different heating rates, the Kinetics parameters, especially activation energy were calculated using simple step Kinetic model for reaction order n = 1. Reasonable fits of data to straight lines in Kinetic Study plot indicate that the reaction order n = 1 used for Kinetic of non-isothermal degradation of the household waste of Abomey-Calavi city in Benin is accepted.
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Thermal Degradation of Household Solid Waste in the Town of Abomey-Calavi in Benin: Kinetic Study
Waste and Biomass Valorization, 2016Co-Authors: Melhyas Kple, Malahimi Anjorin, Benoît Fagla, Pierre Girods, Yann RogaumeAbstract:Thermal behavior of household waste can be improved by knowing thermal degradation Kinetics for the optimal design and operation of pyrolysis process. In the present Study, Thermogravimetric analysis has been used for dynamic Kinetic Study of pyrolysis of waste cardboard, wood, and household waste of Abomey-Calavi city in Benin under Argon atmosphere at different heating rates 5-50 degrees C min-1. For facilitating the laboratory Study of household, a model waste (MW) based on wood (88 %), cardboard (7 %) and plastic (5 %) was developed. The Kinetic of model waste was studied with Friedman isoconversional method. The thermal degradation of MW is processed in two steps: the first step between 200 and 400 degrees C and second step between 400 and 600 degrees C. The difference of mass loss between experimental and theoretical ones (calculated as arithmetic sums of those from each separated component) was used as a criterion of synergetic effect. The experimental results indicated that a low synergetic effect existed between plastic and cellulosic materials during the pyrolysis of MW. Based on TG and DTG data with different heating rates, the Kinetics parameters, especially activation energy were calculated using simple step Kinetic model for reaction order n = 1. Reasonable fits of data to straight lines in Kinetic Study plot indicate that the reaction order n = 1 used for Kinetic of non-isothermal degradation of the household waste of Abomey-Calavi city in Benin is accepted.
Francesco Fantozzi - One of the best experts on this subject based on the ideXlab platform.
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thermogravimetric analysis and Kinetic Study of poplar wood pyrolysis
Applied Energy, 2012Co-Authors: K Slopiecka, Pietro Bartocci, Francesco FantozziAbstract:Abstract Poplar cultivated with Short Rotation Forestry (SRF) technique could be an important source of biomass. This dedicated crop could be produced to obtain solid biofuel transformed through combustion, pyrolysis or gasification into heat and power in CHP plants. In this work a Kinetic Study of the slow pyrolysis process of poplar wood (populus L.) is investigated with a thermogravimetric analyzer. A comparison of selected non-isothermal methods for analyzing solid-state Kinetics data is presented. The weight loss was measured by TGA in nitrogen atmosphere. The samples were heated over a range of temperature from 298 K to 973 K with four different heating rates of 2, 5, 10, 15 K min −1 . The results obtained from thermal decomposition process indicate that there are three main stages such as dehydration, active and passive pyrolysis. In the DTG thermograms the temperature peaks at maximum weight loss rate changed with increasing heating rate. The activation energy and pre-exponential factor obtained by Kissinger method are 153.92 kJ mol −1 and 2.14 × 10 12 min −1 , while, the same average parameters calculated from FWO and KAS methods are 158.58 and 157.27 kJ mol −1 and 7.96 × 10 13 and 1.69 × 10 13 min −1 , respectively. The results obtained from the first method represented actual values of Kinetic parameters which are the same for the whole pyrolysis process, while the KAS and FWO methods presented apparent values of Kinetic parameters, because they are the sum of the parameters of the physical processes and chemical reaction that occur simultaneously during pyrolysis. Experimental results showed that values of Kinetic parameters obtained from three different methods are in good agreement, but KAS and FWO methods are more efficient in the description of the degradation mechanism of solid-state reactions. The devolatilization process was mathematically described by first order single reaction. The results of the Kinetic Study can be used in modeling devolatilization process through computational fluid dynamics (CFDs) to simulate mass and energy balances.
Laura Vicas - One of the best experts on this subject based on the ideXlab platform.
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Thermal behaviour and Kinetic Study of amygdalin
Journal of Thermal Analysis and Calorimetry, 2018Co-Authors: Eleonora Marian, Bogdan Tita, Ioana Cristina Tita, Tunde Jurca, Laura VicasAbstract:The thermal methods of analysis are widely utilized in the Study of stability and thermal decomposition of substances used in medicine, especially drugs. Kinetic studies have become a crucial point in thermal analysis, having as main purpose to determine the Kinetic model of thermal decomposition and to calculate the parameters of the Arrhenius equation. The present work reports the Study of thermal behaviour of amygdalin, active substance, and finding of the melting point based on the thermoanalytical curves, respectively, the determination of the Kinetic parameters. The Kinetic Study regarding the amygdalin’s—active substance—thermal decomposition was performed under non-isothermal conditions and in a nitrogen atmosphere at five heating rates: 2.5; 5; 7.5; 10 and 15 °C min−1. The Kinetic parameters of thermal decomposition process were obtained from TG/DTG curves using the following differential methods: Friedman isoconversional method, respectively, integral methods: Flynn–Wall–Ozawa method, Kissinger–Akahira–Sunose method, Starink method, and Li-Tang method.
Lunbo Duan - One of the best experts on this subject based on the ideXlab platform.
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experimental and Kinetic Study of thermal decomposition behaviour of phytoremediation derived pteris vittata
Journal of Thermal Analysis and Calorimetry, 2017Co-Authors: Xiaole Li, Lunbo Duan, Ying Jiang, Jian Chen, Philip J LonghurstAbstract:Combustion and gasification for biomass to energy conversion is often suggested for the management of residual Pteris vittata from phytoremediation. In this Study, the thermal behaviour of P. vittata was studied on a thermogravimetric analyser, and the Kinetic triplet of biomass sample was further determined for different stages of the thermochemical processes using the Ozawa and KAS methods, subsequently modified by an iterative procedure. Results show that thermal decomposition under combustion condition was complete at a lower temperature of ~500 °C compared to ~700 °C for gasification, indicating the both easily complete conversion of P. vittata by combustion and gasification. Kinetic Study shows that although activation energy for each stage under combustion condition is mostly larger than that under gasification, the reaction rate of thermal decomposition of P. vittata under combustion condition is still great larger than that under gasification condition. These findings strongly suggest that thermochemical processes offer suitable methods for the volume reduction and energy production of P. vittata.
Daniela Almeida Streitwieser - One of the best experts on this subject based on the ideXlab platform.
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Kinetic Study of the Thermal and Catalytic Cracking of Waste Motor Oil to Diesel-like Fuels
Energy & Fuels, 2016Co-Authors: Diana Cristina Vargas, María Belen Alvarez, Alexis Hidrobo Portilla, Daniela Almeida StreitwieserAbstract:Considering the serious impact caused to the environment by the inappropriate disposal of waste motor oils, it is essential to find alternative mechanisms to handle and dispose these wastes in a controlled process. The reuse of waste motor oil as a resource for the synthesis of diesel-like fuels provides an alternative way for the disposal of this residue in a feasible, sustainable, and environmentally responsible way. This work addresses the Kinetic Study of the catalytic cracking of waste motor oil using mesoporous aluminum silicate materials impregnated with 1 and 2% zinc. Both the waste motor oil and liquid fuel product were characterized according to ASTM standards to ensure an adequate characterization and to guarantee the proper quality of the product. The results from the overall Kinetic approach show that the cracking reaction can be described using a first-order rate equation with respect to the concentration of the used motor oil. The activation energy for the thermal cracking reaction is 370 k...
