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Using density-functional theory (DFT), we investigate the selectivity ofadsorption of CO2 over N2 and CH4 on planar-type B clusters, based on ourprevious finding of strong chemisorption of CO2 on the B10-13 planar andquasiplanar clusters. We consider the prototype B8 and B12 planar-type clustersand perform a comparative study of the adsorption of the three molecules onthese clusters. We find that, at room temperature, CO2 can be separated from N2by selective binding to the B12 cluster and not to the B8 cluster. Selectiveadsorption of CO2 over CH4 at room temperature is possible for both clusters.Based on our DFT-adsorption data (including also a semi-infinite Boron sheet)and the available literature-adsorption value for N2 on the planar-type B36cluster, we discuss the selectivity trend of CO2 adsorption over N2 and CH4with planar-cluster size, showing that it extends over sizes including B10-13clusters and significantly larger.

Selective capture of CO2 over N2 and CH4: B clusters and their size effects