文献类型：期刊文献

英文题名：Kinetics of propane dehydrogenation over Pt-Sn/Al2O3 catalyst

作者：Li, Qing[1]; Sui, Zhijun[1]; Zhou, Xinggui[1]; Chen, De[2]

机构：[1] State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China; [2] Department of Chemical Engineering, Norwegian University of Science and Technology [NTNU], Sem SLlandsvei 4, N-7491 Trondheim, Norway

年份：2011

卷号：398

期号：1-2

起止页码：18

外文期刊名：Applied Catalysis A: General

收录：EI(收录号：20111813949109)

语种：英文

外文关键词：Dehydrogenation - Reaction kinetics - Coke - Kinetic parameters - Catalyst activity - Propane - Kinetic theory

摘要：Langmuir-Hinshelwood kinetic models for catalytic propane dehydrogenation on Pt -Sn/Al2O3 are proposed based on the reaction mechanisms that take into account the one step or two-step dehydrogenation and are evaluated by fitting the experiments. When taking into consideration the fitting accuracy, the number of fitting parameters and the rigorousness of the reaction mechanism, the kinetics of propane dehydrogenation based on the assumptions of step-wise dehydrogenation, the first step dehydrogenation as the rate-determining step, and low surface coverage of C3H7 outperforms other kinetic models. The change of catalyst activity with time-on-stream is related to the rate of coke formation that depends on the partial pressures of propene and hydrogen. Finally a complete kinetic model, which includes propane dehydrogenation and cracking and catalyst deactivation because of coking, is developed, which is found to agree well with the changes of propane conversions with time-on-stream under different operating conditions. Direct measurement of coke formation is avoided by the approach employed in this study for the prediction of catalyst deactivation by coke deposition. ? 2011 Elsevier B.V.