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Abstract <p>Catalysts based on copper ferrite and copper aluminate are highly active in the reaction of CO oxidation. We report a detailed <i>in situ</i> X-ray absorption spectroscopy study of CuFe<sub>2</sub>O<sub>4</sub> and CuAl<sub>2</sub>O<sub>4</sub> reduction in a CO flow in the temperature range from 30&#xa0;°C to 600&#xa0;°C. It is shown that the reduction of copper ferrite and copper aluminate in a CO flow leads to the formation of metallic copper. The reduction of copper from Cu<sup>2+</sup> to Cu<sup>1+</sup> and Cu<sup>0</sup> in copper ferrite occurs at lower temperatures (250-300&#xa0;°C) than in copper aluminate (above 400&#xa0;°C). The reduction of copper ferrite also leads to the formation of metallic iron as a result of the following stages: CuFe<sub>2</sub>O<sub>4</sub>&#xa0;→&#xa0;Fe<sub>3</sub>O<sub>4</sub>&#xa0;→&#xa0;FeO&#xa0;→&#xa0;Fe.</p>

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In Situ X-Ray Absorption Spectroscopy Study of Copper Ferrite and Copper Aluminate Reduction

  • 期刊论文

  • 发表日期：

    2025年4月1日

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  • A. M. Kremneva,
  • A. A. Saraev,
  • D. D. Mishenko,
  • E. V. Khramov,
  • A. L. Trigub,
  • V. V. Kaichev

摘要

Abstract

Catalysts based on copper ferrite and copper aluminate are highly active in the reaction of CO oxidation. We report a detailed in situ X-ray absorption spectroscopy study of CuFe2O4 and CuAl2O4 reduction in a CO flow in the temperature range from 30 °C to 600 °C. It is shown that the reduction of copper ferrite and copper aluminate in a CO flow leads to the formation of metallic copper. The reduction of copper from Cu2+ to Cu1+ and Cu0 in copper ferrite occurs at lower temperatures (250-300 °C) than in copper aluminate (above 400 °C). The reduction of copper ferrite also leads to the formation of metallic iron as a result of the following stages: CuFe2O4 → Fe3O4 → FeO → Fe.