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

In order to obtain CO2-absorbents to eliminate CO2 concentration locally, Bi2O3–La2O3 mixed powders were prepared by mechanical alloying (MA) method using a planetary ball-milling machine. CO2-absorption and desorption properties were checked by TG-DTA for the obtained powder samples. As a result, the sample shown by (Bi2O3)1−x(La2O3)x [x≤0.50] was found to form α-Bi2O3-solid solution with repeated CO2-adsorption and desorption around 400– 500 °C. Absorbed and desorbed CO2 contents varied with MA time: the 72 h MA’ed sample had a larger CO2 content than the 24 h MA’ed sample. The performance depended on the sample composition, and (Bi2O3)0.70(La2O3)0.30 was found to have the highest performance in the present system.