Wang Yanyan, Liao Jiaping, Xie Zunyuan, Zhang Kan, Wu Ya, Zuo Ping, Zhang Weiqiang, Li Jiyang, Gao Ziwei
Key Laboratory of Applied Surface and Colloid Chemistry MOE, School of Chemistry and Chemical Engineering, Shaanxi Normal University, Xi'an 710119, P. R. China.
College of Chemistry & Chemical Engineering, Xi'an Shiyou University, Xi'an 710065, P. R. China.
ACS Appl Mater Interfaces. 2020 Mar 11;12(10):11419-11427. doi: 10.1021/acsami.9b18110. Epub 2020 Feb 25.
Supported palladium catalysts have attracted significant attention for use in cross-coupling reactions due to their recyclability. However, the inevitable progressive loss of Pd that occurs in the catalytic process deactivates the catalysts, which hinders their sustainable application. Herein, we report a zeolite-enhanced sustainable Pd catalyst for C-C cross-coupling reactions. Zeolite does a good job of acting as a sink for Pd ions. This catalyst exhibits an excellent homogeneous catalytic performance by releasing Pd species from zeolite. In addition, the Pd ions were successfully recaptured in a controlled catalytic system by combining the uniform microporous structure and good adsorption features of zeolite. The release/capture mechanism of the Pd species guaranteed the high loading and high dispersion of Pd on the recycled catalyst. The 0.84%Pd@USY catalysts were reused at least 10 times in water without an appreciable reduction in activity. This study presents a new perspective toward the design of a highly efficient and sustainable supported metal catalyst.
负载型钯催化剂因其可回收性而在交叉偶联反应中的应用备受关注。然而，催化过程中不可避免地会出现钯的逐渐损失，这会使催化剂失活，从而阻碍其可持续应用。在此，我们报道了一种用于碳 - 碳交叉偶联反应的沸石增强型可持续钯催化剂。沸石能够很好地作为钯离子的捕获剂。该催化剂通过从沸石中释放钯物种表现出优异的均相催化性能。此外，通过结合沸石均匀的微孔结构和良好的吸附特性，钯离子在可控催化体系中被成功重新捕获。钯物种的释放/捕获机制保证了钯在回收催化剂上的高负载量和高分散性。0.84%Pd@USY催化剂在水中至少可重复使用10次，活性没有明显降低。这项研究为高效且可持续的负载型金属催化剂的设计提供了新的视角。
