在多孔α-Al_2O_3陶瓷管上合成ZSM-35型沸石膜

Preparations of zeolite ZSM-35 zembranes on porous α-Al_2O_3 tubes

分别以吡咯烷和正丁胺为模板剂,在多孔αAl2O3陶瓷管(3～5μm)外表面上原位直接合成出ZSM35型沸石膜,XRD、SEM对沸石膜进行表征和单组分气体H2、N2和C3H8的渗透性能测试表明:所合成出的沸石膜表面连续完整,晶粒之间互锁生长,沸石膜的厚度约为12～18μm,具有典型的ZSM35沸石结构,不同的模板剂对沸石膜的表面形态影响较大;经不同焙烧温度处理的沸石膜,随着处理温度增高,沸石膜表面晶粒的排列沿(h00)取向性明显增强;所合成的沸石膜在室温下单组分气体H2、N2和C3H8渗透率达到10-6数量级,H2/N2和H2/C3H8理想分离因数均超过Knudsen扩散.

Respectively in the systems of pyrrodine and 1-Butylamine as templates, ZSM-35 type zeolite membranes were hydrothermally synthesized originally in situ on the outer surface of porous a-Al2O3 tubes with pore size of 3-5μm. Characterization of the as-prepared membranes with XRD and SEM showed that the prepared membranes were typical zeolite ZSM-35 membranes, on which the zeolite crystals grew interlockedly and compactly and covered completely the outer surface of the ceramic tubes with thickness of about 12-18 μm, and that templates with different structures influenced apparently the morphology of the as-prepared membranes; calcinations of as-synthesized membranes at different temperatures indicated the orientation of crystals on the as-prepared membranes tended to be along （h 0 0） direction with increasing calcination temperatures; and at ambient temperature, H2, N2 and C3H8 single component permeance tests of the membranes reached the order of magitude 10^-6 with H2/N2 and H2/C3H8 selectivity factors respectively above their corresponding ideal Knudsen diffusion factors.