Abstract
The study is presented on the influence of the composition of a ceria-zirconia support on the structure and the activity in water-gas shift reaction of platinum catalysts (Pt/Ce0.75Zr0.25O2 and Pt/Ce0.4Zr0.5Y0.05La0.05O2). The structure diagnostics of the samples were performed using high-resolution transmission electron microscopy, powder X-ray diffraction, CO chemisorption and X-ray atomic pair distribution function method. It was shown that the catalysts contain highly dispersed platinum particles not exceeding 2 nm in size. Platinum particles supported on Ce0.75Zr0.25O2 are smaller due to the higher specific surface area of the support. The catalysts Pt/Ce0.75Zr0.25O2 and Pt/Ce0.4Zr0.5Y0.05La0.05O2 proved to have similar efficiency while having the same platinum content. It was assumed that the catalysts supported on Ce0.4Zr0.5Y0.05La0.05O2 demonstrate a slightly higher turnover frequency per platinum surface atom, but it is likely compensated by the difference in the supported metal particle size.
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ACKNOWLEDGMENTS
The study of the samples by transmission electron microscopy was carried out using facilities of the shared research center “National center of investigation of catalysts” at Boreskov Institute of Catalysis. The authors also thank the shared research center VTAN NSU for providing access to the measuring equipment.
Funding
This work was supported by Russian Science Foundation under the project no. 21-73-20075 (А.М. Gorlova, V.P. Pakharukova, О.А. Stonkus, V.N. Rogozhnikov).
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Abbreviations and notation: WGS, water gas shift; WHSV, weight hourly space velocity; ICP-AES, inductively coupled plasma-atomic emission spectroscopy; XRD, X-ray diffraction; CSR, coherent scattering region; PDF, pair distribution function analysis; HR TEM, high-resolution transmission electron microscopy; TPR, temperature-programmed reduction; TPD, temperature-programmed reduction; SBET, specific surface area; Vpore, total pore volume; Vmicropore, micropore volume.
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Gorlova, A.M., Pakharukova, V.P., Stonkus, O.A. et al. Ceria–Zirconia Supported Platinum Catalysts for the Water-Gas Shift Reaction: The Influence of Support Composition. Kinet Catal 64, 449–457 (2023). https://doi.org/10.1134/S0023158423040031
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DOI: https://doi.org/10.1134/S0023158423040031