Abstract
Two types of nanosilicas with different pore structures are synthesized and decorated via impregnation with cobalt and cerium oxides. Meso–microporous spherical silica particles with thin walls of SiO2 nanochannels having specific surface area and pore volume of up to 1400 m2/g and 0.8 cm3/g, respectively, are used. Macroporous three-dimensionally ordered structures based on SiO2 (so-called synthetic opals) consisting of close-packed submicron spherical silica particles with respective porosity characteristics of 11 m2/g and 0.2 cm3/g are also used. The synthesized materials are characterized via low-temperature nitrogen adsorption, X-ray diffraction, SEM, XPS, and Fourier transform IR spectroscopy, and tested as catalysts for the selective oxidation of CO in excess H2 (CO-PROX). The effect of silica, the ratio of introduced oxides, and the order of their introduction on the structure and catalytic properties of Co–Ce/SiO2 are revealed. The catalytic behavior of the synthesized materials is determined from the specificity of interactions among the metal oxides and with the silica surface.
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Funding
Synthesis and structural analysis of the materials were financed within the framework of the state budget agreement (Grant no. 0040-2019-0012). Spectral studies and catalytic tests were performed as part of a State Task for Lomonosov Moscow State University, topic no. АААА-А21-121011590090-7, and the Semenov Federal Research Center of Chemical Physics, topic no. 122040500058-1 “Physics and Chemistry of New Nanostructured Systems and Composite Materials with Desired Properties.” SEM and XPS data were obtained using equipment purchased under the Program for the Development of Lomonosov Moscow State University.
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Rostovshchikova, T.N., Eurov, D.A., Kurdyukov, D.A. et al. Effect of the Pore Structure of Nanosilicas Decorated with Cobalt and Cerium Oxides on Catalytic Activity in the Selective Oxidation of Carbon Monoxide. Russ. J. Phys. Chem. 97, 1978–1989 (2023). https://doi.org/10.1134/S0036024423090212
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DOI: https://doi.org/10.1134/S0036024423090212