Song Huaxing, Fang Geqian, Gao Zhaohua, Su Yang, Yan Xiaorui, Lin Jian, Wang Wenhua, Ren Wanzhong, Wei Haisheng
Department College of Chemistry and Chemical Engineering, Yantai University, Yantai 264005, Shandong China.
CAS Key Laboratory of Science and Technology on Applied Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, Liaoning China.
ACS Appl Mater Interfaces. 2022 Mar 16;14(10):12295-12303. doi: 10.1021/acsami.1c25046. Epub 2022 Mar 4.
Supported metal catalysts play a significant role in heterogeneous catalysis in liquid phase reaction systems, but they usually suffer from a stability problem. Encapsulation of active metal species without the compromise of catalytic performance has been considered as an effective strategy. Here, we report an ultrastable Ru-based catalyst with particle size of around 1.1 nm for selective hydrogenation reaction. The highly dispersed Ru species are covered by the in situ formed porous N-C-ZnO overlayer, which is induced through the transforming of ZIF-8 shell that derives from a ZnO substrate. The resulting Ru/ZnO@N-C-ZnO catalyst can exhibit good stability in the hydrogenation of -chloronitrobenzene after 20 cyclic runs with 100% selectivity toward -chloroaniline. Comparatively, the naked Ru/ZnO catalyst with larger Ru particles shows serious metal leaching issue with inferior stability and poor selectivity. It is revealed that the excellent performance of Ru/ZnO@N-C-ZnO is attributed to the porous overlayer, which strengthens the bonding of Ru nanoparticles on ZnO.
负载型金属催化剂在液相反应体系的多相催化中发挥着重要作用，但它们通常存在稳定性问题。在不影响催化性能的情况下封装活性金属物种被认为是一种有效的策略。在此，我们报道了一种用于选择性加氢反应的粒径约为1.1 nm的超稳定Ru基催化剂。高度分散的Ru物种被原位形成的多孔N-C-ZnO覆盖层所覆盖，该覆盖层是通过源自ZnO基底的ZIF-8壳层的转变而诱导形成的。所得的Ru/ZnO@N-C-ZnO催化剂在对氯硝基苯加氢反应中经过20次循环运行后仍能表现出良好的稳定性，对氯苯胺的选择性为100%。相比之下，具有较大Ru颗粒的裸Ru/ZnO催化剂则存在严重的金属浸出问题，稳定性较差且选择性不佳。结果表明，Ru/ZnO@N-C-ZnO的优异性能归因于多孔覆盖层，它增强了Ru纳米颗粒与ZnO之间的结合。
