Lithium zirconate powder reacts immediately with ambient CO2 in the range of 450 to 550 degrees C. Moreover, the products react and return reversibly to lithium zirconate at temperatures above 650 degrees C. Utilizing this reaction, the possibility of a CO2 separation system which operates at around 550 degrees C is suggested. A CO2 separation process operable at temperatures beyond 500 degrees C may have a special benefit, because the separation can be achieved directly during the fuel reforming process, where high CO2 concentration is expected.