Lithium carbonate-metal oxide mixtures and its application for a CO2 absorbent

Reactivity of the mixed powder of Li2CO3 with several metal oxides (Y2O3, Al2O3, ZrO2, SiO2 and ZrSiO4) in synthetic air and 100% CO2 was examined to develop a high temperature repeatable CO2 absorbent. The mixture of Li2CO3 and Y2O3 in molar ratio of 1:1 was stable in CO2 up to 950 degrees C but decomposed to form LiYO2 at around 850 degrees C in synthetic air (N-2 79%+O-2 21%, CO2<0.5 ppm). The newly formed LiYO2 started to absorb the CO2 at 300 degrees C with the reaction of 2LiYO(2)+CO2 -> Li2CO3+Y2O3. Since the mixture was fairly stable in CO2 up to 980 degrees C, the reversed reaction directed to CO2 emission was not observed in CO2. LiYO2 is a new material for a CO2 absorbent available in a wide range of temperature.