Title: Cyclic CO₂ capture performance of CaO-based sorbents obtained from various precursors

Authors: Deng-Feng Zhang; Li-Li Gu; Yun-Hua Huang

Addresses: Faculty of Chemical Engineering, Kunming University of Science and Technology, No. 727 Jingming South Road, Chenggong District, 650500 Kunming, China ' Faculty of Chemical Engineering, Kunming University of Science and Technology, No. 727 Jingming South Road, Chenggong District, 650500 Kunming, China ' Faculty of Chemical Engineering, Kunming University of Science and Technology, No. 727 Jingming South Road, Chenggong District, 650500 Kunming, China

Abstract: The effects of pore morphology and crystal structure of CaO-based sorbents derived from various precursors were investigated to elucidate the property dependence of CaO-based sorbent performance for cyclic CO₂ capture. The results indicate that CO₂ capture capacity of the first carbonate looping cycle is dependent on the specific surface area of CaO-based sorbents. The carbonation conversions of the initial calcined sorbent are restricted from 29% to 83% due to the limitations in the small pores with diameter range from 20 to 70 nm. The initial calcination of CaO-based sorbents obtained from the inorganic precursors leaves an 'imprint' in the following carbonation/calcination cycles, which leads to greater decay rate of carbonate conversion than the organic precursors. Increase of carbonate conversion with cycle number is found for CaO-based sorbent obtained from calcium L-lactate hydrate and this reactivation phenomenon is probably due to its special crystal structure.

Keywords: CaO based sorbents; CO2; carbon dioxide; carbon capture; pore morphology; crystal structure; calcium oxide; inorganic precursors; carbonation; calcination; organic precursors.

DOI: 10.1504/IJGW.2015.067750

International Journal of Global Warming, 2015 Vol.7 No.2, pp.226 - 241

Received: 09 Feb 2013
Accepted: 14 Jun 2013
Published online: 05 Mar 2015 *

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