An efficient and recyclable heterogeneous palladium catalyst utilizing naturally abundant pearl shell waste

作者：Zeng Minfeng^*; Du Yijun; Qi Chenze; Zuo Shufeng; Li Xiudong; Shao Linjun; Zhang Xian Man

来源：Green Chemistry, 2011, 13(2): 350-356.

DOI：10.1039/c0gc00780c

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.

• 出版日期2011
• 单位中国科学院长春应用化学研究所; 绍兴文理学院