The Experts below are selected from a list of 24 Experts worldwide ranked by ideXlab platform
Kaniz Fizza Azhar - One of the best experts on this subject based on the ideXlab platform.
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kinetic Studies of Pyrolysis and combustion of thar coal by thermogravimetry and chemometric data analysis
Journal of Thermal Analysis and Calorimetry, 2012Co-Authors: Anila Sarwar, Nasiruddin M Khan, Kaniz Fizza AzharAbstract:The concept of weighted mean activation energy has been used to assess the reactivity of Thar coal in terms of pyrolytic and combustion behavior using non-isothermal thermogravimetry. The samples were characterized as low sulfur and high volatile lignite to subbituminous coal. Modified Coats–Redfern method was applied to analyze the kinetic data of both processes. Thermal degradation of the samples studied was explained by three independent first-order kinetic steps. The good correlation coefficients for the independent first-order reaction models show the complexity of the overall process. The activation energy for Pyrolysis reaction ranges from 19.20–63.55 to 23.68–54.49 kJ mol−1 for combustion profile. The samples of different rank were classified applying chemometric approach on the reactivity parameters. Principal component analysis was found as a statistical tool to organize the coal samples in accordance to ASTM classification. This study broadens the scope of thermal analysis in the field of coal utilization by assessing coal reactivity.
Anila Sarwar - One of the best experts on this subject based on the ideXlab platform.
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kinetic Studies of Pyrolysis and combustion of thar coal by thermogravimetry and chemometric data analysis
Journal of Thermal Analysis and Calorimetry, 2012Co-Authors: Anila Sarwar, Nasiruddin M Khan, Kaniz Fizza AzharAbstract:The concept of weighted mean activation energy has been used to assess the reactivity of Thar coal in terms of pyrolytic and combustion behavior using non-isothermal thermogravimetry. The samples were characterized as low sulfur and high volatile lignite to subbituminous coal. Modified Coats–Redfern method was applied to analyze the kinetic data of both processes. Thermal degradation of the samples studied was explained by three independent first-order kinetic steps. The good correlation coefficients for the independent first-order reaction models show the complexity of the overall process. The activation energy for Pyrolysis reaction ranges from 19.20–63.55 to 23.68–54.49 kJ mol−1 for combustion profile. The samples of different rank were classified applying chemometric approach on the reactivity parameters. Principal component analysis was found as a statistical tool to organize the coal samples in accordance to ASTM classification. This study broadens the scope of thermal analysis in the field of coal utilization by assessing coal reactivity.
Nasiruddin M Khan - One of the best experts on this subject based on the ideXlab platform.
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kinetic Studies of Pyrolysis and combustion of thar coal by thermogravimetry and chemometric data analysis
Journal of Thermal Analysis and Calorimetry, 2012Co-Authors: Anila Sarwar, Nasiruddin M Khan, Kaniz Fizza AzharAbstract:The concept of weighted mean activation energy has been used to assess the reactivity of Thar coal in terms of pyrolytic and combustion behavior using non-isothermal thermogravimetry. The samples were characterized as low sulfur and high volatile lignite to subbituminous coal. Modified Coats–Redfern method was applied to analyze the kinetic data of both processes. Thermal degradation of the samples studied was explained by three independent first-order kinetic steps. The good correlation coefficients for the independent first-order reaction models show the complexity of the overall process. The activation energy for Pyrolysis reaction ranges from 19.20–63.55 to 23.68–54.49 kJ mol−1 for combustion profile. The samples of different rank were classified applying chemometric approach on the reactivity parameters. Principal component analysis was found as a statistical tool to organize the coal samples in accordance to ASTM classification. This study broadens the scope of thermal analysis in the field of coal utilization by assessing coal reactivity.
M. Z. A. Badr - One of the best experts on this subject based on the ideXlab platform.
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Pyrolysis and photolysis processes of pyran and thiopyran derivatives
Monatshefte Fur Chemie, 1997Co-Authors: A. A. Atalla, A. M. Hussein, M. Z. A. BadrAbstract:Pyrolysis and photolysis of 2-amino-3,5-dicyano-6-phenyl-4H-pyran (1) afford HNCO, acrylonitrile, cinnamonitrile, and 2-hydroxy-3,5-dicyano-6-phenylpyridine. Pyrolysis of 2-carboxyimino-3,5-dicyano-6-phenyl-4H-pyran (2) gives HCN, acrylonitrile, cinnamonitrile and 2-hydroxy-3,5-dicyano-6-phenylpyridine. Furthermore, both Pyrolysis and photolysis of 2,6-diamino-3,5-dicyanothiopyran (3a) gives rise to HNCS, acrylonitrile and 6-amino-3,5-dicyano-6-mercaptopyridin. Moreover, comparative Studies of Pyrolysis and photolysis of 2,6-dicyano-4-arylthiopyran derivatives3b–d revealed similar results. The similarity of products obtained from Pyrolysis and photolysis and the mechanistic implications of these data are discussed.
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Pyrolysis and photolysis processes of pyran and thiopyran derivatives
Monatshefte für Chemie Chemical Monthly, 1997Co-Authors: A. A. Atalla, A. M. Hussein, M. Z. A. BadrAbstract:Pyrolysis and photolysis of 2-amino-3,5-dicyano-6-phenyl-4 H -pyran ( 1 ) afford HNCO, acrylonitrile, cinnamonitrile, and 2-hydroxy-3,5-dicyano-6-phenylpyridine. Pyrolysis of 2-carboxyimino-3,5-dicyano-6-phenyl-4 H -pyran ( 2 ) gives HCN, acrylonitrile, cinnamonitrile and 2-hydroxy-3,5-dicyano-6-phenylpyridine. Furthermore, both Pyrolysis and photolysis of 2,6-diamino-3,5-dicyanothiopyran ( 3a ) gives rise to HNCS, acrylonitrile and 6-amino-3,5-dicyano-6-mercaptopyridin. Moreover, comparative Studies of Pyrolysis and photolysis of 2,6-dicyano-4-arylthiopyran derivatives 3b–d revealed similar results. The similarity of products obtained from Pyrolysis and photolysis and the mechanistic implications of these data are discussed. Pyrolyse und Photolyse von 2-Amino-3,5-dicyano-6-phenyl-4 H -pyran ( 1 ) ergeben HNCO, Acrylnitril, Zimtsäurenitril und 2-Hydroxy-3,5-dicyano-6-phenyl pyridin. Durch Pyrolyse von 2-Carboximino-3,5-dicyano-6-phenyl-4 H -pyran ( 2 ) entstehen HCN, Acrylnitril, Zimtsäurenitril und 2-Hydroxy-3,5-dicyano-6-phenylpyridin. Weiters resultieren sowohl Photolyse als auch Pyrolyse von 2,6-Diamino-3,5-dicyanithiopyran ( 3a ) in der Bildung von HNCS, Acrylnitril und 6-Amino-3,5-dicyano-6-mercaptopyridin. Vergleichende Untersuchungen zur Pyrolyse und Photolyse von 2,6-Dicyano-4-arylthiopyranderivaten ( 3b–d ) lieferten vergleichbare Ergebnisse. Die Ähnlichkeit der Resultate von Pyrolyse und Photolyse sowie die sich daraus ergebenden mechanistischen Implikationen werden diskutiert.
Guy Furdin - One of the best experts on this subject based on the ideXlab platform.
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Hydrogen transfer from tetralin and decalin to high-temperature coal tars. Relation with carbon deposit formation
Fuel Processing Technology, 1996Co-Authors: Janusz Pajak, V. Krebs, J.f. Marêché, Guy FurdinAbstract:Studies of Pyrolysis of a coal charge containing various quantities of water from 0.8 to 15 wt.% in a two-stage reactor were performed. The rate of formation of solid carbon deposits was followed and some properties of high-temperature tars were investigated. These tars differ in elemental composition and hexane solubility. Hydrogen acceptor abilities were evaluated by reaction with tetralin at 320°C and with decalin at 400°C. Hydrogen transfer from decalin to several model organic compounds was also studied. The rate of carbon deposit formation and hydrogen acceptor abilities of tars are different for various quantities of water in the starting coal charge. The relation between the hydrogen transfer properties of tars expressed as the ratio of decalin hydrogen transfer (DHT) to tetralin hydrogen transfer (THT) and the rate of carbon deposit formation seems to indicate the importance of hydrogen transfer during secondary Pyrolysis.
