An Nihong, Dai Yunsheng, Tang Chun, Yuan Xiaoling, Dong Jilong, Shen Yafeng, Zhou Wei
State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals, Sino-Platinum Metals Co. Ltd., Kunming Institute of Precious Metals, Kunming 650106, China.
State Key Laboratory of Advanced Technologies for Comprehensive Utilization of Platinum Metals, Sino-Platinum Metals Co. Ltd., Kunming Institute of Precious Metals, Kunming 650106, China.
J Colloid Interface Sci. 2016 May 15;470:56-61. doi: 10.1016/j.jcis.2016.01.066. Epub 2016 Feb 3.
A series of well-dispersed carbon supported Pd catalysts were prepared by a simple and effective method under mild conditions. The functionalized carbon supported Pd catalyst (Pd/AC-H) demonstrated a enhanced performance to original carbon supported Pd catalyst (Pd/AC) in the probe reaction hydrogenation of 3,4-(1',3'-Dibenzyl-2'-oxoimidazolido)-2-(4-carboxybutylidene)thiophane to dibenzylbiotinmethylester. The results of various characterization techniques revealed that the improvement of Pd dispersion on Pd/AC-H catalyst surface could be associated to the presence of abundant oxygen-containing groups available for anchorage. Furthermore, the role of the surface groups of carbon supports was indispensable since they could provide an efficient pathway for the reaction. The oxygen-containing groups located at the Pd-supports interface were able to adjust the strength of reactant adsorption/activation on the Pd active sites, which was responsible for the high yield of dibenzylbiotinmethylester.
通过一种简单有效的方法在温和条件下制备了一系列分散良好的碳载钯催化剂。在3,4-(1',3'-二苄基-2'-氧代咪唑啉基)-2-(4-羧基亚丁基)噻吩加氢生成二苄基生物素甲酯的探针反应中，功能化碳载钯催化剂（Pd/AC-H）相对于原始碳载钯催化剂（Pd/AC）表现出增强的性能。各种表征技术的结果表明，Pd/AC-H催化剂表面上钯分散性的提高可能与存在大量可用于锚固的含氧基团有关。此外，碳载体表面基团的作用不可或缺，因为它们可以为反应提供一条有效的途径。位于钯-载体界面处的含氧基团能够调节反应物在钯活性位点上的吸附/活化强度，这是二苄基生物素甲酯高产率的原因。
