CeO2-modified CaO/Ca12Al14O33 bi-functional material for CO2 capture and H2 production in sorption-enhanced steam gasification of biomass

Xianyao Yan, Yingjie Li, Xiaotong Ma, Zhiguo Bian, Jianli Zhao and Zeyan Wang

Energy, 2020, vol. 192, issue C

Abstract: A novel CeO2-modified CaO/Ca12Al14O33 bi-functional material fabricated by wet-mixing method was used in sorption-enhanced steam gasification of biomass for H2 production. The CO2 capture performance of the bi-functional material was investigated during the multiple carbonation/calcination cycles in a dual fixed-bed reactor. H2 production from the sorption-enhanced steam gasification of bagasse char using CeO2-modified CaO/Ca12Al14O33 was studied. When the mass ratio of CaO/Ca12Al14O33/CeO2 is 75:10:15, CO2 capture capacity of CeO2-modified CaO/Ca12Al14O33 reaches 0.48 g/g after 20 cycles under the realistic calcination condition, which is 30% higher than that of CaO/Ca12Al14O33. The average H2 concentration and yield using CeO2-modified CaO/Ca12Al14O33 during 10 cycles achieve 81.1 vol% and 0.124 L/g, which are 17.4% and 47.3% higher than those using CaO/Ca12Al14O33, respectively. CeO2 in CeO2-modified CaO/Ca12Al14O33 enhances water gas shift and steam methane reforming reactions. CeO2-modified CaO/Ca12Al14O33 possesses stronger basicity, and Ce3+ in the surface creates oxygen vacancies and promotes the conductivity of lattice oxygen, which are favorable for CO2 capture. CeO2 improves the cyclic stability of CaO/Ca12Al14O33 and stabilizes pores in 10–100 nm in diameter, which facilitates CO2 capture and H2 production. Thus, CeO2-modified CaO/Ca12Al14O33 appears promising for H2 production from the sorption-enhanced steam gasification of biomass.

Keywords: Sorption-enhanced steam gasification; Bagasse char; CO2 capture; H2 production; Bi-functional material; CeO2-Modified CaO/Ca12Al14O33 (search for similar items in EconPapers)
Date: 2020
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Citations: View citations in EconPapers (10)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:192:y:2020:i:c:s036054421932359x

DOI: 10.1016/j.energy.2019.116664

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