气候变化领域集成服务门户(CCPortal): Heterojunction-redox catalysts of Fe: XCoyMg10CaO for high-temperature CO2capture and in situ conversion in the context of green manufacturing

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DOI	10.1039/d0ee03320k
	Heterojunction-redox catalysts of Fe: XCoyMg10CaO for high-temperature CO2capture and in situ conversion in the context of green manufacturing
	Shao B.; Hu G.; Alkebsi K.A.M.; Ye G.; Lin X.; Du W.; Hu J.; Wang M.; Liu H.; Qian F.
发表日期	2021
ISSN	17545692
起始页码	2291
结束页码	2301
卷号	14 期号:4
英文摘要	The integration of carbon capture and CO2 utilization could be a promising solution to the crisis of global warming. By integrating calcium-looping (CaL) and the reverse-water-gas-shift (RWGS) reaction, a high-temperature CO2 capture and in situ conversion technology is successfully realized in one fixed-bed column at the same operating temperature of 650 °C. Inspired by the heterojunction photocatalytic mechanism, the heterojunction-redox catalysis strategy is proposed for the first time by doping the bimetallic Fe3+/Fe2+ and Co3+/Co2+ redox couples into a hierarchical porous CaO/MgO composite. The presence of different valence states of doped Fe and Co oxides not only provides extra oxygen vacancies to facilitate CO2 adsorption, and hence adsorption enhanced conversion (AEC), but also significantly lowers the electric potential difference of Fe3+/Fe2+ through the newly formed Fermi level in Fe5Co5Mg10CaO, which makes electron spillover easier to improve the catalytic activity in the RWGS reaction for CO2 conversion. More importantly, with the high-temperature refractory MgO and the highly disperse Fe and Co oxides in Fe5Co5Mg10CaO, the problem of CaO sintering is successfully solved. An excellent and stable high-temperature CO2 capture capacity of 9.0-9.2 mmol g-1, an in situ CO2 conversion effeciency near 90% and a CO selectivity close to 100% are achieved in the integrated CaL/RWGS process. In addition, experimental and simulation scale-up studies further demonstrate its pratical scalability. Economic evaluation reveals that the integrated CaL/RWGS technology is much more cost-effective than the individual CaL and RWGS processes. Therefore, the heterojunction-redox strategy provides a unique way to design bifunctional adsorbent/catalyst materials. The integrated CaL/RWGS process could be a promising technology for CO2 capture and utilization. This journal is © The Royal Society of Chemistry.
英文关键词	Calcium oxide; Carbon dioxide; Catalyst activity; Cobalt compounds; Cost effectiveness; Electric currents; Electric potential; Global warming; Green manufacturing; Heterojunctions; Iron oxides; Magnesia; Oxide minerals; Sintering; Conversion technology; Economic evaluations; Electric potential difference; Fixed bed columns; Hierarchical porous; High temperature; Operating temperature; Reverse water gas shift; Water gas shift; electrochemical method; energy efficiency; energy storage
语种	英语
来源期刊	Energy & Environmental Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/190716
作者单位	School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China; Key Laboratory of Advanced Control and Optimization for Chemical Processes, Ministry of Education, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China; State Key Laboratory of Chemical Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237, China; Department of Chemical and Biological Engineering, University of Sheffield, Sheffield, S1 3JD, United Kingdom
推荐引用方式 GB/T 7714	Shao B.,Hu G.,Alkebsi K.A.M.,et al. Heterojunction-redox catalysts of Fe: XCoyMg10CaO for high-temperature CO2capture and in situ conversion in the context of green manufacturing[J],2021,14(4).
APA	Shao B..,Hu G..,Alkebsi K.A.M..,Ye G..,Lin X..,...&Qian F..(2021).Heterojunction-redox catalysts of Fe: XCoyMg10CaO for high-temperature CO2capture and in situ conversion in the context of green manufacturing.Energy & Environmental Science,14(4).
MLA	Shao B.,et al."Heterojunction-redox catalysts of Fe: XCoyMg10CaO for high-temperature CO2capture and in situ conversion in the context of green manufacturing".Energy & Environmental Science 14.4(2021).