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Title

Enhancement of fast CO 2 capture by a nano-SiO 2/CaO composite at Ca-looping conditions

AuthorsValverde, J.M.; Perejón, Antonio ; Pérez-Maqueda, Luis A.
Issue Date2012
PublisherAmerican Chemical Society
CitationEnvironmental Science and Technology 46: 6401- 6408 (2012)
AbstractIn this paper we show the performance of a new CO 2 sorbent consisting of a dry physical mixture of a Ca-based sorbent and a SiO 2 nanostructured powder. Thermo-gravimetric analysis (TGA) performed at conditions close to the Ca-looping process demonstrate that the rate of CO 2 capture by the mixture is enhanced during the fast carbonation stage of practical interest in applications. Moreover, the residual capture capacity of the mixture is increased. SEM/EDX, physisorption, and XRD analyses indicate that there is a relevant interaction between the nanostructured SiO 2 skeleton and CaO at high temperatures, which serves to improve the efficiency of the transfer of CO 2 to small reactive pores as well as the stability of the sorbent pore structure. © 2012 American Chemical Society.
URIhttp://hdl.handle.net/10261/98795
DOI10.1021/es3002426
Identifiersdoi: 10.1021/es3002426
issn: 0013-936X
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