Separation and Purification Technology, Vol.51, No.2, 210-218, 2006
Synthesis and characterization of Ce-ZSM-5 zeolite membranes
The effects of synthesis parameters on the property of Ce-ZSM-5 zeolite membrane grown onto porous a-alumina supports were investigated. The zeolite membranes synthesized were characterized by XRD, DTA/TG, FT-IR, SEM, EDS and single gas permeation. Orthogonal test indicate, aging at lower temperature and longer stirring time were preferred for Ce-ZSM-5 zeolite membrane. Lower alkalinity and higher Ce2O3/SiO2 favor the formation of pure Ce-ZSM-5 structure. Higher alkalinity and lower SiO2/Ce2O3, impurities such as quartz and cerium oxide, which hinder the Ce-ZSM-5 formation were easily produced. Under optimum synthesis conditions, the permeances for H-2, N-2, CH4, CO2 were 4.73 x 10(-6), 1.56 x 10(-6), 1.51 x 10(-6) and 1.36 x 10(-6) mol/m(2) s Pa, respectively; the ideal selectivity of membrane at room temperature for H-2/CO2, H-2/N-2, H-2/CH4 were 3.13, 3.03, 3.48, respectively. (C) 2006 Elsevier B.V. All rights reserved.