催化作用
膜
化学工程
纳米颗粒
膜反应器
微滤
离子交换
化学
材料科学
纳米-
传质
离子
纳米技术
色谱法
有机化学
工程类
生物化学
作者
Boya Qiu,Yilin Wang,Jiaojiao Chen,Yu Chen,Shanhui Fan,Zenghui Mai,Jingyun Liu,Ke Bai,Lei Deng,Zeyi Xiao
标识
DOI:10.1016/j.memsci.2021.120183
摘要
A catalytic membrane micro-reactor (CMMR) is fabricated, with nano Cu/ZIF-8 particles immobilized in the pores of the microfiltration membrane for flow-through catalysis. Nano ZIF-8 is firstly assembled in polyethersulfone (PES) membrane pores by flowing synthesis and then Cu nanoparticles (NPs) are synthesized in-situ in ZIF-8 by the partial ion-exchange reaction. Cu/ZIF-8 nanoparticles are distributed evenly throughout the whole direction of membrane thickness while Cu NPs are dispersed well in ZIF-8. The 4-nitrophenol (4-NP) reduction is used to test the performance of the CMMR. The 4-NP reduction rate being 99.3% is achieved when the membrane flux is 2293 L m−2 h−1. The CMMR has good stability for over 210 min and presents a surprisingly high apparent reaction rate constant (Kapp, 837.43 min−1) at room temperature with the loading of ZIF-8 being 85 mg g−1 (PES) and Cu loading cycle number being 1. Compared with batch catalysis by powder catalysts, the Kapp is increased by 4 orders of magnitude via flow-through catalysis mode using CMMR. The nanoscale configuration of ZIF-8 and Cu NPs assembled inside pores of the membrane enhances remarkably the catalytic activity owing to the enhanced contact and mass transfer in the confined space of membrane pores.
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