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dc.contributor.authorSubha, P.
dc.contributor.authorNair, Balagopal
dc.contributor.authorHareesh, P.
dc.contributor.authorMohamed, A.
dc.contributor.authorYamaguchi, T.
dc.contributor.authorWarrier, K.
dc.contributor.authorHareesh, U.
dc.identifier.citationSubha, P. and Nair, B. and Hareesh, P. and Mohamed, A. and Yamaguchi, T. and Warrier, K. and Hareesh, U. 2015. CO2 absorption studies on mixed alkali orthosilicates containing rare-earth second-phase additives. Journal of Physical Chemistry C. 119 (10): pp. 5319-5326.

© 2015 American Chemical Society. Lithium silicate containing eutectic orthosilicate mixtures developed by a solid-state route displayed excellent characteristics as carbon dioxide absorbents at elevated temperature, showing absorption capacity of 256 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 absorbents (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 orthosilicate phase. The 2:1 sample containing yttrium oxide gave absorption capacity of 315 mg g-1 of 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.

dc.publisherAmerican Chemical Society
dc.titleCO2 absorption studies on mixed alkali orthosilicates containing rare-earth second-phase additives
dc.typeJournal Article
dcterms.source.titleJournal of Physical Chemistry C
curtin.departmentNanochemistry Research Institute
curtin.accessStatusFulltext not available

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