DEVELOPMENT OF MESOPOROUS MEMBRANE MATERIALS FOR CO2 SEPARATION; SEMIANNUAL

Mesoporous and precipitated alumina were synthesized as the base material for CO(sub 2) adsorbent. The porous alumina is doped with Ba to enhance it CO(sub 2) affinity due to the basicity of Ba. it is shown by gas chromatograph (GC) that the addition of Ba enhances the separation CO(sub 2) from N(sub 2). It was found that mesoporous alumina has larger specific surface area and better selectivity of CO(sub 2) than precipitated alumina. Ba improves the affinity of mesoporous alumina with CO(sub 2). Phase may play an important role in selective adsorption of CO(sub 2). It is speculated that mesoporous alumina is more reactive than precipitated alumina creating the xBaO(centerdot) Al(sub 2)O(sub 3) phase that may be more affinity to CO(sub 2) than N(sub 2). On the other hand, the barium aluminate phase (Ba(sub 3)Al(sub 2)O(sub 6)) in the mesoporous sample does not help the adsorption of CO(sub 2)