CO2 Absorption Studies on Mixed Alkali Orthosilicates Containing Rare-Earth Second-Phase Additives

Lithium silicate containing eutectic orthosilicate mixtutes developed by a solid-state, route displayed excellent characteristics as Carbon dioxide absorbents at elevated temperature, showing absorption capacity of 2.50 mg g(-1). Incorporation of second-phase materials was investigated as a strategy to enhance the stability of the absorbent materials against agglomeration and sintering during powder processing and high-temperature cyclic absorption/desorption loading. Yttrium oxide, gadolinium oxide, and lanthanum phosphate were added as second phases to the absorbent. It was found that when the composites were rich in absotbents (10:1 and 20:1 absorbent/second phase), the absorption performance was hardly influenced by the type of the second-phase Material present. Yttrium oxide or gadolinium oxide additions in large quantities were found to enhance the absorption capacity of the otthosilicate phase. The 2:1 sample containing ytttium oxide gave absorption capacity of 315 mg g(-1) orthosilicate absorbent present in the composite sample. On the basis of the structural and morphological studies, we believe that the nonreactive second-phase components formed a virtual shell against the segregation of absorbent phase, thereby helping to improve their absorption performance. Cyclic studies have supported the superior Stability and performance of such composite absorbent materials.