Preparation of microfibrous supported silicalite-1 zeolite membrane by secondary growth method

Stainless steel microfibrous supported silicalite-1 zeolite membrane (silicalite-1 membrane/SMF) was prepared by secondary growth method from TEOS as Si source. The effects of different operation parameters such as support pretreatment methods, crystallization temperature and crystallization time on the silicalite-1 membrane/SMF were studied. The morphology and microstructure of silicalite-1 membrane/SMF were characterized by XRD, SEM and ASAP-2020 automatic adsorption instrument, respectively. The results show that the silicalite-1 zeolite membrane prepared by treating support with anodic oxidation method is more continuous and denser than that with calcinations. The surface of zeolite membrane is much denser and the size of crystal grains increases with increasing the crystallization temperature from 100℃ to 160℃ or prolonging the crystallization time from 12h to 96h. The specific surface areas, total pore volume and micropore volume of the silicalite-1 membrane/SMF are 93.24 m2·g-1, 0.0654 cm3·g-1 and 0.0382 cm3·g-1, respectively. The percentage of micropore volume is 58% of total pore volume. The silicalite-1 membrane content determined for silicalite-1/SMF composite is 23.3 %(wt). ©, 2015, Zhejiang University. All right reserved.