Comparative study of MCe0.75Zr0.25Oy (M = Cu, Mn, Fe) catalysts for selective reduction of NO by CO: Activity and reaction pathways

He, Junyao, Kang, Running, Wei, Xiaolin, Huang, Junqin, Feng Bin, Wai Y., Nam Hui, Kwun, San Hui, Kwan ORCID: https://orcid.org/0000-0001-7089-7587 and Wu, Dongyin (2021) Comparative study of MCe0.75Zr0.25Oy (M = Cu, Mn, Fe) catalysts for selective reduction of NO by CO: Activity and reaction pathways. Carbon Resources Conversion, 4. pp. 205-213. ISSN 2588-9133

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Abstract

Basic oxygen furnace steelmaking leads to the production of CO-rich off-gas. When CO and NO are combined in off-gas, selective catalytic reduction by CO (CO-SCR) effectively achieves the synergistic removal of both pollutants. In this paper, CuCe 0.75Zr 0.25O y, MnCe 0.75Zr 0.25O y, and FeCe 0.75Zr 0.25O y catalysts are prepared and evaluated for their CO-SCR activity, and the results show that the reaction system needs to be anaerobic; thus, the CO-SCR reaction can be dominant. The T 90 values of CuCe 0.75Zr 0.25O y and FeCe 0.75Zr 0.25O y are 200 °C and 223 °C, respectively. The activities of these two catalysts are higher than that of MnCe 0.75Zr 0.25O y (T 90 = 375 °C). Linear nitrate and bridged bidentate nitrate are the main intermediate species involved in NO conversion on the catalyst surface, and bidentate CO 3 2− coordination is the main intermediate species involved in CO conversion on the catalyst surface. CuCe 0.75Zr 0.25O y has high lattice oxygen mobility and is more likely to react with NO and CO. In the presence of oxygen, most CO is oxidized by O 2, which increases continuously to 100%, 100%, and 98% for CuCe 0.75Zr 0.25O y, FeCe 0.75Zr 0.25O y, and MnCe 0.75Zr 0.25O y, respectively; additionally, CO is oxidized by O 2, and the CO-SCR reaction cannot be carried out.

Item Type: Article
Uncontrolled Keywords: co-scr,catalytic combustion,oxygen species,reaction mechanism,synergistic removal,fuel technology,materials science (miscellaneous),process chemistry and technology,catalysis ,/dk/atira/pure/subjectarea/asjc/2100/2103
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Depositing User: LivePure Connector
Date Deposited: 22 Jul 2021 00:07
Last Modified: 19 Aug 2022 01:17
URI: https://ueaeprints.uea.ac.uk/id/eprint/80688
DOI: 10.1016/j.crcon.2021.07.002

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