Fabrication of ceramic membrane supported palladium catalyst and its catalytic performance in liquid-phase hydrogenation reaction
Fabrication of ceramic membrane supported palladium catalyst and its catalytic performance in liquid-phase hydrogenation reaction
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陶瓷膜负载钯催化剂的制备及其液相加氢反应性能
DOI：
10.1016/j.cej.2016.11.037
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发表时间：
2017-04
影响因子：
15.1
通讯作者：
Rizhi Chen
中科院分区：
文献类型：
--
作者：
Yefei Liu;Minghua Peng;Hong Jiang;Weihong Xing;Yong Wang;Rizhi Chen
将金属纳米粒子固定在膜上制备膜催化剂是一种很有前途的方法。膜的表面性质对负载MNP起着关键作用。本研究采用多巴胺对陶瓷膜进行功能化处理，然后将钯纳米粒子负载到改性后的陶瓷膜上，制备膜催化剂。考察了膜催化剂的微观结构，并考察了其在硼氢化钠还原对硝基苯酚反应中的催化性能。此外，还研究了对硝基苯酚在膜催化剂上还原的反应动力学。更高的催化活性和稳定性，观察到的Pd纳米粒子沉积在聚多巴胺功能化的膜相比，没有修改的膜。提出的较高催化活性的原因是较高负载量的Pd NPs。通过聚多巴胺的架桥作用，将Pd纳米粒子以化学键的形式负载到功能化陶瓷膜上，使Pd纳米粒子不易从膜上脱落，具有上级催化稳定性。发现合成的膜催化剂的活化能较低，这应该与小的Pd颗粒尺寸和流通操作模式有关。这些发现为合成具有优异催化性能的膜催化剂提供了新的思路。
Immobilization of metal nanoparticles (MNPs) on membranes to fabricate membrane catalysts is a promising approach for the catalysis. The membrane surface property plays a key role for the loading of MNPs. In this study, dopamine was adopted to functionalize the ceramic membrane and then Pd NPs were loaded on the modified membrane to fabricate a membrane catalyst. The microstructure of as-synthesized membrane catalyst was investigated and its catalytic properties were tested in thep-nitrophenol reduction top-aminophenol with sodium borohydride. Furthermore, the reaction kinetics ofp-nitrophenol reduction over the membrane catalyst was studied. Higher catalytic activity and stability were observed for the Pd NPs deposited on the polydopamine-functionalized membrane as compared to the membrane without modification. The reason proposed for the higher catalytic activity was the higher loading amount of Pd NPs. The Pd NPs were loaded onto the functionalized ceramic membrane by chemical bonds through the bridging function of polydopamine; thus, it was not easy for the Pd NPs to detach from the membrane, and a superior catalytic stability could be obtained. A lower activation energy was found for the as-synthesized membrane catalyst, which should be related to the small Pd particle size and the flow-through operation model. These findings would provide novel ideas for the synthesis of membrane catalysts with outstanding catalytic properties.
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