CO2 absorption and desorption of Bi2O3–La2O3 powders prepared by mechanical synthesis

Abstract In order to obtain CO 2 -absorbents to eliminate CO 2 concentration locally, Bi 2 O 3 –La 2 O 3 mixed powders were prepared by mechanical alloying (MA) method using a planetary ball-milling machine. CO 2 -absorption and desorption properties were checked by TG-DTA for the obtained powder samples. As a result, the sample shown by (Bi 2 O 3 ) 1− x (La 2 O 3 ) x [ x ≤0.50] was found to form α-Bi 2 O 3 -solid solution with repeated CO 2 -adsorption and desorption around 400– 500 °C. Absorbed and desorbed CO 2 contents varied with MA time: the 72 h MA’ed sample had a larger CO 2 content than the 24 h MA’ed sample. The performance depended on the sample composition, and (Bi 2 O 3 ) 0.70 (La 2 O 3 ) 0.30 was found to have the highest performance in the present system.