文献类型：期刊文献

英文题名：A Highly Efficient and Stable Palladium Catalyst Entrapped within the Cross-Linked Chitosan Membrane for Heck Reactions

作者：Zeng, Minfeng[1];Qi, Chenze[1];Yang, Jing[2];Wang, Baoyi[2];Zhang, Xian-Man[1]

机构：[1]Shaoxing Univ, Zhejiang Key Lab Alternat Technol Fine Chem Proc, Shaoxing 312000, Peoples R China;[2]Chinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China

年份：2014

卷号：53

期号：24

起止页码：10041

外文期刊名：INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH

收录：SCI-EXPANDED(收录号：WOS:000337720500011)、、EI(收录号：20142617872660)、Scopus(收录号：2-s2.0-84902821965)、WOS

基金：We acknowledge financial support from the National Natural Science Foundation of China (Grant 21203123), Key Sci-Tech Innovation Team Project of Zhejiang Province, China (Grant 2010R50014-19), and Academic Climbing Project for the youth academic leaders of Zhejiang Province, China (Grant pd2013391).

语种：英文

外文关键词：Catalyst activity - Chitosan - Dimethyl sulfoxide - Organic solvents - Palladium

外文摘要：In this study, chitosan directly cross-linked by Pd-II cation membranes (Pd-cr-CSM) with good mechanical strength and thermal stabilities have been prepared. Although the prepared Pd-cr-CSM has neither open porous structure nor high specific surface areas, it has similar good catalytic activity and much higher stability as compared with typical prepared chitosan-stabilized palladium heterogeneous catalysts for Heck reactions. It is highly active for the Heck reactions of aryl iodides and bromides with a strong electron-withdrawing group at a palladium catalyst loading of 0.15 mol %. It can be recycled 12 times in dimethyl sulfoxide (DMSO) solution or 7 times in aqueous solution. The high activity and extreme stability of the Pd-cr-CSM catalyst are mainly attributed to the well-entrapped palladium nanoparticles inside the chitosan matrix, which might catalyze the coupling reactions in the free volume holes (open spaces) of the swollen cross-linked chitosan gel networks.