Decay on Cyclic CO 2 Capture Performance of Calcium-Based Sorbents Derived from Wasted Precursors in Multicycles

Dehong Gong, Zhongxiao Zhang and Ting Zhao
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Dehong Gong: School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
Zhongxiao Zhang: School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
Ting Zhao: School of Electrical Engineering, Guizhou University, Guiyang 550025, China

Energies, 2022, vol. 15, issue 9, 1-15

Abstract: In order to obtain the cheap waste calcium-based sorbent, three wasted CaCO 3 precursors, namely carbide slag, chicken eggshells, and analytical reagent-grade calcium carbonate, were selected and prepared at 700 °C to form calcium-based sorbents for CO 2 capture. TGA was used to test the CO 2 uptake performance of each calcium-based sorbent in 20 cycles. To identify the decay mechanism of CO 2 uptake with an increasing number of cycles, all calcium-based sorbents were characterized by using XRF, XRD, and N 2 adsorption. The specific surface area of calcium-based sorbents was used to redefine the formula of cyclic carbonation reactivity decay. The carbonation conversion rate of three calcium-based sorbents exhibited a decreasing trend as the cycle number increased. Chicken eggshells exhibited the most significant decrease rate (over 50% compared with Cycle 1), while carbide slag and analytical reagent-grade calcium carbonate showed a flat linear decline trend. The specific surface area of the samples was used to calculate carbonation conversion for an infinite number of cycles. The carbonation conversion rates of three calcium-based sorbents were estimated to decrease to 0.2898, 0.1455, and 0.3438 mol/mol, respectively, after 100 cycles.

Keywords: carbon dioxide capture; carbonation reaction; thermogravimetric analysis; calcium looping (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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