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The asymmetric microporous silica xerogel membrane was prepared by sol-gel method. A multi-layer (asymmetric) structure was obtained by silica xerogel layer on top of mesoporous silica layer (mean pore diameter of 4 nm), supported by porous alumina tube (mean pore diameter of 0.1 μm). The ratio of the permeances, CO2/N2 for this membrane attained more than 60 at 298 K. This value is considerably higher...
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