AVILA adolfo Maria
congresos y reuniones científicas
Characterization of natural zeolite membranes for H2/CO2 separations by single gas permeation
S.A.H. HEJAZI, A.M. AVILA, T.M. KUZNICKI, A. WEIZHU, S.M. KUZNICKI
Congreso; International Congress on Membranes ICOM 2011; 2011
University of Twente
Natural zeolite membranes are economical, thermally stable and have high tolerance to sulfur. Sensible screening methods are required in order to optimize the permselectivity properties of these molecular sieve materials. In this work, natural clinoptilolite-rich materials from mountain Kobau, BC, Canada were sectioned into disk-shaped solid membranes. H2/CO2 permeation measurements were performed at temperatures ranging from 25 C to 300 C and pressure differences across the membranes M1 and M2 from 101.3 kPa to 202.7 kPa. Permeation mechanisms were studied based on various mass transport contributions such as zeolitic, Knudsen and viscous flux. The intracrystalline and intercrystalline fluxes were modeled based on Maxwell-Stefan formulation and dusty gas model respectively. Comparative parameters were introduced to characterize the membranes based on the relative average defect size, the cross sectional area of non-zeolite pores and diffusion coefficients. The results from these analyses were consistent with adsorption isotherms and experimental ideal permeance selectivities.