Preparation of Rho Zeolite Membranes on Tubular Supports

摘要

Rho zeolite crystals of 0.8 μm and Rho zeolite membranes were hydrothermally synthesized without using organic structure-directing agents (OSDAs). Rho zeolite membranes with thickness of 1 ~ 2 μm were formed on the outer surface of porous a -Al2O3 tubes via secondary growth method. Membrane showed CO2/CH4 and CO2/N2 ideal selectivities of ca. 6.8 and 2.8, respectively, which are smaller than the reported adsorption selectivities. Rho zeolite membranes showed dehydration performance when water/ethanol and water/isopropanol mixtures were applied. The highest separation factor obtained for water/isopropanol was 1390 with a total flux of 0.77 kg m~(-2) h~(-1) when 95wt% isopropanol feed was applied at 348K.