CARBON DIOXIDE ABSORBING MATERIAL, AND METHOD AND APPARATUS FOR SEPARATING CARBON DIOXIDE USING THE SAME

摘要

A carbon-dioxide-gas absorber includes a composite oxide as a main component, the composite oxide containing Ti and a constituent X that is at least one of Sr and Ba, and the composite oxide having an (X/Ti) of 1.8 to 2.2 on a molar basis. A substance having a perovskite structure and having an (X/Ti) of 0.9 to 1.1 or at least one selected from green sheets, green sheet wastes, green-sheet-laminate wastes, and precursors of green sheets containing the substance is fired in the presence of at least one of strontium carbonate and barium carbonate. An apparatus includes a carbon-dioxide-gas-absorbing mechanical unit A that allows a carbon-dioxide-gas absorber 3 of the present invention to absorb a carbon dioxide gas at 1.0 × 10 4 to 1.0 × 10 6 Pa and at 500°C to 900°C; and a carbon-dioxide-gas-desorbing mechanical unit B that desorbs the absorbed carbon dioxide gas at 1000 Pa or less and at 750°C or higher.