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

Junyao He, Running Kang, Xiaolin Wei, Junqin Huang, Wai Y. Feng Bin, Kwun Nam Hui, Kwan San Hui, Dongyin Wu

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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.

Original languageEnglish
Pages (from-to)205-213
Number of pages9
JournalCarbon Resources Conversion
Volume4
Early online date10 Jul 2021
DOIs
Publication statusPublished - 2021

Keywords

  • CO-SCR
  • Catalytic combustion
  • Oxygen species
  • Reaction mechanism
  • Synergistic removal

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