Abstract: The work presents a study and comparison of the catalytic properties of hopcalite catalysts composed of copper–manganese and copper–cobalt–manganese spinel particles in the low-temperature CO oxidation reaction. The cubic spinel structure was formed immediately under reaction conditions through the transformation of hydrothermally prepared crednerite CuMn(Co)O2 particles. Both the initial crednerite-type and the resultant spinel-type particles (Cu, Mn, Co)3O4 exhibited a lamellar morphology and a uniform distribution of elements throughout their bulk and surface. It was found that the modification of the copper–manganese oxide with cobalt resulted in increased particle dispersion and a significant distortion of the crednerite crystal lattice. As a result, this modification reduced the temperature required for the crednerite-to-spinel transformation to 250 °C, whereas the unmodified catalyst is transformed after heating to 350–400 °C only. Furthermore, it was demonstrated that during the CO oxidation at room temperature, the modified spinel particles (Cu, Mn, Co)3O4 exhibited a specific catalytic activity ∼3.5 times greater than that of the copper–manganese system. This enhancement is associated with the stabilization of a more oxidized surface state for the modified spinel particles, which may involve an increased contribution of Co3+ and Mn4+ surface species, as well as an enhancement in the overall lattice oxygen mobility.

Cite: Svintsitskiy D.A. , Kvasova E.S. , Kardash T.Y. , Sokovikov N.A. , Stonkus O.A. , Boronin A.I.
Highly Efficient Cobalt-Modified Hopcalite Catalyst Prepared through the Crednerite-Spinel Transformation
Reaction Chemistry & Engineering. 2025. V.10. N5. P.1021-1037. DOI: 10.1039/d4re00552j WOS Scopus OpenAlex

Dates:

Submitted:	Nov 14, 2024
Accepted:	Jan 17, 2025
Published online:	Jan 17, 2025
Published print:	May 1, 2025

Identifiers:

Web of science:	WOS:001409094000001
Scopus:	2-s2.0-85216762747
OpenAlex:	W4406557526

Citing: Пока нет цитирований

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