Patent ID: 8197576

Claim:
A CO 2 -facilitated transport membrane, comprising: a hydrophilic porous membrane having a heat resistance of 100° C. or higher; and a gel layer formed from a polyvinyl alcohol-polyacrylic acid copolymer gel membrane containing moisture, which contains at least one of cesium carbonate and cesium bicarbonate and cesium hydroxide therein as an additive, the gel layer being supported on the hydrophilic porous membrane; wherein the gel membrane has CO 2 /H 2 selectivity under a temperature condition of 100° C. or higher, and wherein the gel layer is formed such that a weight ratio of cesium carbonate relative to a total weight of the polyvinyl alcohol-polyacrylic acid copolymer gel membrane and cesium carbonate is 65% by weight or more and 85% by weight or less.