文献类型：期刊文献

中文题名：Hydrogenation of Commercial Polystyrene over Pd/BaSO_4 Catalysts: Effect of Carrier Structure

英文题名：Hydrogenation of commercial polystyrene over Pd/BaSO4 catalysts: Effect of carrier structure

作者：Han, Kaiyue[1]; Meng, Chen[1]; Zhu, Zhenwei[1]; Cao, Guiping[1]

机构：[1] UNILAB, School of Chemical Engineering, East China University of Science and Technology, Shanghai 200237, China

年份：2014

卷号：20

期号：4

起止页码：282

中文期刊名：Transactions of Tianjin University

外文期刊名：Transactions of Tianjin University

收录：EI(收录号：20143418090800);Scopus

基金：Supported by the Non-governmental International Science and Technology Cooperation Program from the Science and Technology Commission of Shanghai Municipality(No.10520706000);Specialized Research Fund for the Doctoral Program of Higher Education of China(No.20110074110012);State Key Laboratory of Chemical Engineering Open Fund(No.SKL-ChE09C07)

语种：英文

中文关键词：polystyrene hydrogenation; carrier structure; supported catalyst

外文关键词：Activation energy - Ethylene - Ethylene glycol - Polystyrenes - Sulfur compounds - Catalyst activity - Barium sulfate - High resolution transmission electron microscopy - Dispersions - Palladium - Solutions - Hydrogenation - X ray diffraction

摘要：A variety of barium sulfate(BaSO4) carriers with or without mesopore structure were synthesized via precipitation reaction in aqueous solution of barium hydroxide and sulfuric acid with ethylene glycol as a modifying agent, and then calcined at various temperatures. The obtained BaSO4 was used as catalyst carriers for polystyrene(PS) hydrogenation, and BaSO4 supported palladium(Pd) catalysts with Pd content of 5wt% were prepared by using impregnation method. N2 physisorption, transmission electron microscopy, X-ray diffraction and kinetics studies were used to investigate the effect of carrier structure on the dispersion and geometric location of active metal and their catalytic activities in PS hydrogenation. It was found that the pore structure of carrier played an important role in the dispersion and location of Pd grains. The activation energy values for all the Pd/BaSO4 catalysts were around 49.1kJ/mol, while the pre-exponential factor for Pd/BSC-6H was much higher than others. The Pd/BSC-6H without mesopores had Pd grains deposited on the external surface of the carrier, and exhibited better activity than the mesoporous catalysts. It is indicated that the utilization of Pd/BSC-6H can reduce the pore diffusion of PS coils and enabled more active sites to participate in the PS hydrogenation.
A variety of barium sulfate (BaSO4) carriers with or without mesopore structure were synthesized via precipitation reaction in aqueous solution of barium hydroxide and sulfuric acid with ethylene glycol as a modifying agent, and then calcined at various temperatures. The obtained BaSO4 was used as catalyst carriers for polystyrene (PS) hydrogenation, and BaSO4 supported palladium (Pd) catalysts with Pd content of 5wt% were prepared by using impregnation method. N2 physisorption, transmission electron microscopy, X-ray diffraction and kinetics studies were used to investigate the effect of carrier structure on the dispersion and geometric location of active metal and their catalytic activities in PS hydrogenation. It was found that the pore structure of carrier played an important role in the dispersion and location of Pd grains. The activation energy values for all the Pd/BaSO4 catalysts were around 49.1 kJ/mol, while the pre-exponential factor for Pd/BSC-6H was much higher than others. The Pd/BSC-6H without mesopores had Pd grains deposited on the external surface of the carrier, and exhibited better activity than the mesoporous catalysts. It is indicated that the utilization of Pd/BSC-6H can reduce the pore diffusion of PS coils and enabled more active sites to participate in the PS hydrogenation. ? 2014 Tianjin University and Springer-Verlag Berlin Heidelberg.