Abstract: The paper presents an investigation into the physicochemical and catalytic properties of CuBO2 oxides with a delafossite/crednerite-type structure, exploring the dependence on the nature of the B3+ cation (Mn3+, Co3+, Cr3+, Fe3+, and Ga3+). The catalytic properties in CO oxidation were examined in conjunction with structural data, surface composition, the distribution of surface metal states, and the reactivity of oxygen. The selection of synthesis conditions was tailored to yield crystallized CuBO2 particles exhibiting either a delafossite or crednerite structure, depending on the nature of the B3+ cation nature. Thermal stability increases in the following order: CuMnO2 < CuCrO2 ≈ CuFeO2 ≈ CuCoO2 < CuGaO2. Heating of all the studied mixed oxides in the CO + O2 mixture to 250 °C did not cause changes in the phase composition and structural characteristics. The highest catalytic activity near room temperature was observed for CuMnO2 and CuCrO2. A correlation was established between the catalytic activity of CuBO2 and the reactivity of surface oxygen, presumably attributed to the pronounced lability of the redox transitions between the Cu1+/Cu2+ and Bn+/Bm+ pairs. The transformation of the delafossite/crednerite into a spinel structure can cause both deactivation (B = Fe and Co) and significant catalytic activation (B = Mn and Cr) in low-temperature CO oxidation.

Cite: Svintsitskiy D.A. , Kvasova E.S. , Sokovikov N.A. , Metalnikova V.M. , Kardash T.Y. , Cherepanova S.V. , Boronin A.I.
Influence of the B3+ Cation Nature on the Properties of CuBO2 Oxides (B=Mn, Co, Cr, Fe, and Ga) with a Delafossite/Crednerite Structure
Inorganic Chemistry. 2025. DOI: 10.1021/acs.inorgchem.5c01254 WOS Scopus PMID OpenAlex

Dates:

Submitted:	Mar 19, 2025
Accepted:	Jun 23, 2025
Published online:	Jul 30, 2025

Identifiers:

Web of science:	WOS:001520445500001
Scopus:	2-s2.0-105009424526
PMID:	40586737
OpenAlex:	W4411785967

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