Preparation of ZSM-5 zeolite membranes by combined hyclrothermal synthesis and eiectrophoretic deposition

摘要

The preparation of a ZSM-5 zeolite membrane on porous stainless steel disk by hydrothermal synthesis with eiectrophoretic deposition (EPD) as a seeding method was investigated. Micron size ZSM-5 crystal powder was seeded by EPD on the support disk by using ZSM-5 powder dispersed in ethanol. The seeded amounts were easily controlled by the deposition time during EPD. The membrane after secondary growth had a low amount of zeolite in comparison with the in situ seeding method and the permeance of single gas such as He, N_2 and CO_2 was also low in comparison with that of the in situ seeding method.