膜科学与技术

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ZIF-8-based mixed matrix carbon membranes for C3H6/C3H8 separation

Authors： XU Xiaofeng, XU Ruisong, WANG Yue, WANG Tonghua, LI Lin

Units： State Key Laboratory of Fine Chemicals, Laboratory of Carbon Membranes and Porous Carbon Materials, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, Liaoning, China

KeyWords： mixed matrix membrane; carbon membrane; metal-organic frameworks; gas separation; light hydrocarbon separation

ClassificationCode：TQ 028.8

year,volume(issue):pagination： 2023,43(4):84-89

Abstract：

Mixed matrix carbon membranes were prepared from the pyrolysis of mixed matrix polymeric membranes at high temperature via using ZIF-8 as dopant. The evolution of the morphology and pore structure characteristics of ZIF-8 during pyrolysis and its effect on the micropore structure and carbon structure of carbon membranes were investigated by XRD, SEM, N2 adsorption and other characterization methods. The effects of ZIF-8 doping amount and carbonization temperature on the C3H6/C3H8 separation performance of mixed matrix carbon membranes were also investigated. The results show that ZIF-8 can still partially maintain its microstructure and pore structure after heat treatment at 550℃. Meanwhile, the introduction of the ZIF-8 derived nanoporous carbon increases the content of ultramicropores with molecular sieving function in carbon membrane, which significantly enhances the C3H6/C3H8 selectivity of mixed matrix carbon membranes. Compared to the carbon membranes without ZIF-8 doping (the C3H6/C3H8 selectivity is 5.1), the C3H6/C3H8 selectivity of ZIF-8-based mixed carbon membrane with the doping amount of 10wt% and prepared at carbonization temperature of 550℃ is improved by 182% with the C3H6 permeability of 174 Barrer, which exceeds the C3H6/C3H8 upper bounds of polymeric membranes.

Funds：

中国博士后科学基金(2021M690516)，国家自然科学基金项目(21878033，22178044)

AuthorIntro：

徐笑峰（1996—），男，内蒙古通辽市，硕士研究生，研究方向：气体分离膜技术、炭分子筛膜、混合基质膜；E-mail: 17854217558@163.com

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