MFI-type◆ zeolitic membranes were prepared by a vapor-phase transport method on porous α-alumina flat disks. Pure or mixed gas permeation measurements of butane isomers were performed at 375 K using two methods: pressure gradient (PG) and concentration gradient (CG) methods. Pure gas permeation measurements of H2, He, CH4, N2, O2, CO2 and SF6 were also carried out using PG method. Counter-diffusion of helium as a sweep gas was evaluated by determining the gas composition at the outlet of the feed side. It was confirmed that the counter-diffusion of helium occurs only when the total pressure of the feed side was <80kPa. In the mixed gas permeation measurements, the value of separation factor depended on the method of gas permeation. The separation factors of n-butane to i-butane were ca. 10 in the PG method and 30-60 in the CG method.
|出版ステータス||Published - 2000 2 25|
|イベント||3rd International Conference on Catalysis in Membrane Reactors (ICCMR 98) - Copenhagen, Denmark|
継続期間: 1998 9 8 → 1998 9 10
ASJC Scopus subject areas
- 化学 (全般)