膜科学与技术

用于C3H6/C3H8分离的ZIF-8混合基质炭膜

作者：徐笑峰，徐瑞松，王月，王同华，李琳

单位：大连理工大学化工学院精细化工国家重点实验室炭膜及多孔炭材料研究室，辽宁大连 116024

关键词：混合基质膜；炭膜；金属有机框架；气体分离；轻烃分离

出版年,卷(期):页码： 2023,43(4):84-89

摘要：

以ZIF-8为掺杂剂，通过对混合基质聚合物膜高温炭化制备了混合基质炭膜。通过XRD、SEM、N2吸附等表征方法探究了ZIF-8高温热解前后微观形貌和孔结构特征对炭膜微孔结构和炭结构的影响，并考察了ZIF-8掺杂量与炭化温度对混合基质炭膜C3H6/C3H8渗透分离性能的影响。结果表明，ZIF-8经550℃热处理后仍能够部分保持其微观形貌和孔结构，同时ZIF-8热解衍生多孔炭的引入增加了炭膜具有筛分功能的极微孔含量，因而显著提高了混合基质炭膜对C3H6/C3H8的分离选择性。在10wt% ZIF-8掺杂量和550℃炭化温度下，所制备ZIF-8混合基质炭膜的C3H6渗透系数高达174 Barrer，C3H6/C3H8分离选择性为14.4，与未掺杂的纯炭膜相比（C3H6/C3H8选择性为5.1）提高了182%，渗透选择性超越了聚合物膜的C3H6/C3H8分离Upper Bound线。

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.

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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