用于C_(3)H_(6)/C_(3)H_(8)分离的ZIF-8混合基质炭膜  

ZIF-8-based mixed matrix carbon membranes for C_(3)H_(6)/C_(3)H_(8)separation

作　　者：徐笑峰 徐瑞松 王月 王同华[1] 李琳[1] XUXiaofeng;XURuisong;WANG Yue;WANG Tonghua;LI Lin(State Key Laboratory of Fine Chemicals,Schol of Chemical Engineering,Dalian University of Technology,Dalian 116024,China)

机构地区：[1]大连理工大学化工学院,精细化工国家重点实验室,大连116024

出　　处：《膜科学与技术》2023年第4期84-89,98,共7页Membrane Science and Technology

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

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、N_(2)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C_(3)H_(6)/C_(3)H_(8)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C_(3)H_(6)/C_(3)H_(8)的分离选择性.在ZIF-8掺杂质量分数1%和炭化温度550℃下,所制备ZIF-8混合基质炭膜的C_(3)H_(6)渗透系数高达174 Barrer,C_(3)H_(6)/C_(3)H_(8)分离选择性为14.4,与未掺杂的纯炭膜相比(C_(3)H_(6)/C_(3)H_(8)选择性为5.1)提高了182%,渗透选择性超越了聚合物膜的C_(3)H_(6)/C_(3)H_(8)分离上限.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,N_(2)adsorption and other characterization methods.The effects of ZIF-8 doping amount and carbonization temperature on the C_(3)H_(6)/C_(3)H_(8)Hs 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 C_(3)H_(6)/C_(3)H_(8)selectivity of mixed matrix carbon membranes.Compared with the carbon membranes without ZIF-8 doping(the C_(3)H_(6)/C_(3)H_(8)Hg selectivity is 5.1),the C_(3)H_(6)/C_(3)H_(8)Hs selectivity of ZIF-8-based mixed carbon membrane with the doping mass fraction of 10%and prepared at carbonization temperature of 550℃is improved by 182%with the C_(3)H_(6)permeability of 174 Barrer,which exceeds the C_(3)H_(6)/C_(3)H_(8)Hg upper bounds of polymeric membranes.

关 键 词：混合基质膜 炭膜 金属有机框架 气体分离 轻烃分离 

分 类 号：TQ028.8[化学工程]