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 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: 16 Sep 2021 11:13
URI: https://ueaeprints.uea.ac.uk/id/eprint/80688
DOI: 10.1016/j.crcon.2021.07.002

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