采用复合晶种法在大孔载体上制备高性能ZSM-5沸石膜  

Preparation of High Performance ZSM-5 Zeolite Membrane on Macroporous Support by Composite Seeding Method

作　　者：杨丽君[1] 殷德宏[1] 王金渠[1] 杨建华[1] 鲁金明[1] 张艳[1] 

机构地区：[1]大连理工大学精细化工国家重点实验室吸附与无机膜研究所,大连116012

出　　处：《硅酸盐通报》2012年第5期1212-1217,共6页Bulletin of the Chinese Ceramic Society

摘　　要：采用复合晶种法在α-Al2O3载体上制备ZSM-5沸石膜。首先采用热浸渍-擦涂法在大孔α-Al2O3载体上预涂一层由纳米ZSM-5分子筛团聚而成的大晶种颗粒,对载体表面的大孔进行初步修饰;然后在此基础上利用提拉法涂覆小晶种,从而形成一层薄而连续的晶种层;最后在175℃下利用二次生长法制备ZSM-5沸石膜。采用SEM和XRD等方法,对制备的ZSM-5沸石膜进行表征,并对其进行渗透汽化性能测试。结果表明:制备的ZSM-5膜连续、致密且厚度为8μm;在温度353 K下,分离质量分数为90%的乙酸/水体系,其渗透通量可达0.89 kg/(m2.h),分离系数接近于无穷大。Composite seeding technology was developed to prepare ZSM-5 zeolite membrane on the macroporous α-A1203 support. In this method, the support was first modified by hot dip coating-wipping with large nanocrystal-assembled ZSM-5 seed crystals, and then small seeds were coated on the pre- treated support to obtain a thin and continuous seeds layer. At last, the ZSM-5 zeolite membrane was fabricated by the seeded secondary growth at 175 ℃. The as-synthesized ZSM-5 zeolite membrane was characterized by SEM, XRD and pervaporation measurement. The results show that well-intergrown continuous ZSM-5 membrane with about thickness of 8 μm was formed. Pervaporation experiences which were carried out under 353 K displayed that the total flux of the membrane reached 0.89 kg/（m2 · h）, and the separation factor was w when dehydration of the 90wt% acetic acid.

关 键 词：复合晶种法 ZSM-5沸石膜 渗透蒸发 乙酸/水体系 

分 类 号：TQ383[化学工程]