Abstract
The activation of a series of catalysts with the general formula Ni0.9M0.1O (M = Co, Ce, Mn, and Zr) synthesized by coprecipitation and the effect of modifying additives on the phase composition and structure of these catalysts were studied. The effect of additives on the initial state of the samples was studied by X-ray diffraction (XRD) analysis, and their role in the process of NiO reduction was studied using in situ XRD analysis and temperature-programmed reduction with hydrogen (TPR-H2). It was found that the modifiers changed the structure and microstructure of the initial samples to increase the specific surface area and decrease the average coherent scattering region (CSR) sizes of NiO. The introduction of Mn and Co led to the formation of substitutional solid solutions with the oxide NiO. For Ce and Zr, the release of the oxide CeO2 and X-ray amorphous ZrOx was observed. The use of these additives led to an increase in the temperature of NiO reduction to a metallic state compared to that of the massive oxide. In addition, the effect of modifying additives on the particle size of the final metal was revealed. The use of Ce and Mn decreased the average CSR size of Ni by a factor of 2–5 compared to that of massive NiO.
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ACKNOWLEDGMENTS
The X-ray diffraction studies were performed using the equipment of the Center for Collective Use “National Center for the Study of Catalysts.” The equipment of the Shared Research Center “Siberian Synchrotron and Terahertz Radiation Center” on the basis of the VEPP-4–VEPP-2000 Electron–Positron Collider Complex at the Budker Institute of Nuclear Physics, Siberian Branch, Russian Academy of Sciences was used in this work. The authors are grateful to Z.S. Vinokurov for performing in situ XRD analysis.
Funding
This work was carried out within the framework of a state contract of the Boreskov Institute of Catalysis, Siberian Branch, Russian Academy of Sciences (project no. AAAA-A21-121011390011-4).
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Translated by V. Makhlyarchuk
Abbreviations and notation: XRD, X-ray diffraction; TPR-H2, temperature-programmed reduction with hydrogen; CSR, coherent scattering region; a, lattice parameter; Ssp, specific surface area.
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Mikhnenko, M.D., Afonasenko, T.N., Rogov, V.A. et al. Activation of Nickel Oxide Catalysts Modified with Cobalt, Cerium, Manganese, and Zirconium. Kinet Catal 64, 484–493 (2023). https://doi.org/10.1134/S0023158423040079
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DOI: https://doi.org/10.1134/S0023158423040079