文献类型：期刊文献

英文题名：An efficient and recyclable heterogeneous palladium catalyst utilizing naturally abundant pearl shell waste

作者：Zeng, Minfeng[1];Du, Yijun;Qi, Chenze;Zuo, Shufeng;Li, Xiudong;Shao, Linjun;Zhang, Xian-Man

机构：[1]Univ Shaoxing, Inst Appl Chem, Shaoxing 312000, Zhejiang, Peoples R China; Univ Shaoxing, Dept Chem, Shaoxing 312000, Zhejiang, Peoples R China

年份：2011

卷号：13

期号：2

起止页码：350

外文期刊名：GREEN CHEMISTRY

收录：SCI-EXPANDED(收录号：WOS:000287092500017)、、Scopus(收录号：2-s2.0-79751508785)、WOS

基金：We greatly appreciate the financial support from the Natural Science Foundation (Y-4080450) of Zhejiang Province, China and University of Shaoxing.

语种：英文

外文摘要：An efficient and recyclable ligand-free heterogeneous catalyst has been prepared by the immobilization of palladium onto ground pearl shell powders (Pd/shell powders, Pd/SP). The catalytic activity and recyclability of the prepared Pd/SP along with the charcoal and calcium carbonate supported palladium (Pd/C and Pd/CaCO3) catalysts have been evaluated using the reductive homocoupling of aromatic halides. Pd/SP not only has higher catalytic activity, but also exhibits much stronger stability than Pd/C and Pd/CaCO3. The remarkable Pd/SP stability has been attributed to the chelation of palladium species with the surface chitin and protein molecules of the supported pearl shell powders. The X-ray photoelectron spectroscopy (XPS) studies show that the reductive Pd-0 species can be regenerated in situ from the oxidative Pd2+ species for the Pd/SP catalyzed reductive homocoupling of aromatic halides in ethanol/DMSO solution, suggesting that the heterogeneous and homogeneous palladium catalysis proceeds through a similar Pd-0/Pd2+ cycle catalytic mechanism.