硅烷聚合物修饰对SAPO-34分子筛膜的分离性能的影响  

The Influence of the Modification Using a Siloxane Polymer on Permeation Performance of SAPO-34 Membranes

作　　者：王华梅[1] 布娜[1] 吴婷[1] 周荣飞[1] 陈祥树[1] 

机构地区：[1]江西师范大学化学化工学院,江西省无机膜材料工程技术研究中心,江西南昌330022

出　　处：《江西师范大学学报（自然科学版）》2015年第5期469-473,共5页Journal of Jiangxi Normal University(Natural Science Edition)

基　　金：科技部“863”计划(2012AA03A609);国家自然科学基金(20906042,20966003);江西省自然科学基金(2015ZACB20018)资助项目

摘　　要：采用化学液相沉积(CLD)技术将含有咪唑官能团的硅烷聚合物沉积在SAPO-34分子筛膜表面,修饰膜的缺陷以提高其气体渗透选择性.通过傅里叶红外(FT-IR)、X-射线衍射(XRD)和场发射扫描电子显微镜(FE-SEM)等表征手段证明了硅烷聚合物以Si—O—Si共价键形式成功地接枝在膜表面.在298 K、0.1 MPa压力差的测试条件下,修饰后SAPO-34分子筛膜的CO2/CH4理想分离选择性由12提高到76,提高了5倍,CO2的渗透速率由7.22×10-7mol/(m2·s·Pa)降低至4.13×10-7mol/(m2·s·Pa),降低了42.8%.考察了温度和压力差对SAPO-34分子筛膜的CO2和CH4渗透速率的影响.A siloxane polymer coating with the imidazole group was grafted on the surface of SAPO-34 membranes to patch the defects by chemical liquid deposition method. Characterizations including field emission scanning electron microscopy（ FE-SEM）,X-ray diffraction（ XRD） and Fourier transform infrared spectroscopy（ FT-IR）,showed that siloxane polymers were coated on the surfaces of crystals and membrane by Si—O—Si covalent bond. The patched SAPO-34 membrane（ S-M-2） showed an increased CO2/ CH4 ideal selectivity by a factor of 5（ from 12 to76）,and a decreased CO2 permeance by 42. 8% [from 7. 22 × 10-7mol /（ m2·s·Pa） to 4. 13 × 10-7mol /（ m2·s·Pa） ] at 298 K and a pressure drop of 0. 1 MPa. Theinfluences of temperature and pressure drop on single CO2 and CH4permeances through SAPO-34 membranes werealsostudied.

关 键 词：SAPO-34分子筛膜 缺陷 修饰 CO2/CH4分离 

分 类 号：TQ028.8[化学工程]