Carbon dioxide removal using calcium aluminate carbonates on titanic oxide under warm-gas conditions

Ching-tsung Yu, Huan-ting Kuo and Yi-ming Chen

Applied Energy, 2016, vol. 162, issue C, 1122-1130

Abstract: This study presents a scale-up production method for Ti including Ca/Al sorbents and their CO2 sorption test under warm gas conditions by thermogravimetric (TG) analysis and fixed-bed reactor experiments. The Ca/Al/Tix sorbents are made by the precipitation-and-deposition method where Ca2+ and Al3+ ions are deposited via an alkaline solution of OH−/CO32− on TiO2 powder. The titanium dioxide binder facilitates CO2 capture and enhances the CO2 capacity and multicycle stability by adjusting the Ti/Ca ratio. The results showed that these sorbents exhibited excellent CO2 capture stability of 96–98% after ten cycles at 750°C by TG analysis. Characterization by XRD indicated that the reduction in the deterioration of the sorbent during the cycle test could possibly result from the formation of an anti-sintering compound such as CaTiO3 along with calcium aluminate hydroxides related to katoite. Using a reactor as test rig, the amount of sorbent and total capture weight was significantly increased. This TiO2-coated sample of Ca/Al/O–TiO2 provides a feasible route for the manufacture of cheap CO2 sorbents.

Keywords: CaO; TiO2; CO2 capture (search for similar items in EconPapers)
Date: 2016
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Citations: View citations in EconPapers (4)

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DOI: 10.1016/j.apenergy.2014.12.046

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