文献类型：期刊文献

英文题名：Novel macroporous palladium cation crosslinked chitosan membranes for heterogeneous catalysis application

作者：Zeng, Minfeng[1];Yuan, Xia[1];Yang, Zhen[1];Qi, Chenze[1]

机构：[1]Shaoxing Univ, Zhejiang Key Lab Alternat Technol Fine Chem Proc, Shaoxing 312000, Peoples R China

年份：2014

卷号：68

起止页码：189

外文期刊名：INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES

收录：SCI-EXPANDED(收录号：WOS:000338414600031)、、Scopus(收录号：2-s2.0-84900813002)、WOS

基金：The authors acknowledge the financial support from the National Natural Science Foundation of China (grant number: 21203123), Key Sci-Tech Innovation Team Project of Zhejiang Province, China (grant number: 2010R50014-19), academic climbing project for the youth academic leader of Zhejiang Province, China (grant number: pd2013391).

语种：英文

外文关键词：Chitosan; Porous membranes; Heterogeneous catalysis

外文摘要：A novel palladium supported on chitosan porous membrane heterogeneous catalyst has been prepared by freeze-drying of Pd2+-crosslinked chitosan gel solution. The prepared membrane catalyst has three-dimensional porous structure (porosity: >70%). The crosslinking effects of Pd2+ to chitosan were good for the improvement of the mechanical properties and thermal stabilities. Pd2+ cations have been shown not only as the crosslinker, but also as the catalytic active sites. The reductive palladium species of the recycled membrane catalysts was found in the nanometer scale (20-40 nm). Excellent cross-coupling yields were achieved using as low as 0.12 mol% palladium catalyst loading for the Heck-type reaction of aromatic halides with acrylates. The catalyst could be recycled six times without obvious decreased conversion. (C) 2014 Elsevier B.V. All rights reserved.