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Abstract <p>Catalysts based on nickel, cobalt, and platinum deposited on coal and silica gel are synthesized and investigated. Energy dispersive X-ray analysis (EDX) is performed to determine the distribution of metals in the bulk phase. The atomic ratio in subsurface layers is measured via X-ray photoelectron spectroscopy (XPS). It is shown that the concentration of metal on a surface can differ significantly from its content in the bulk phase. Profiles of the distribution of metal from the surface to the depth of a catalyst granule are constructed. Textural characteristics of the studied catalysts are obtained. A way of determining the number of active sites on a catalyst’s surface is proposed based on EDX, XPS, and the textural characteristics of a sample. The calculated numbers of metal atoms are compared to the amount of reactive hydrogen adsorbed on active centers. Results allow determination of the effect synthesis has on the content of active sites on the surface of a catalyst.</p>

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Amounts of Reduced Metal on the Surfaces of Catalysts for the Liquid-Phase Hydrogenation of Unsaturated Hydrocarbons

  • 期刊论文

  • 发表日期：

    2025年10月16日

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  • A. V. Afineevskii,
  • D. A. Prozorov,
  • T. Yu. Osadchaya,
  • K. A. Nikitin,
  • D. V. Smirnov

摘要

Abstract

Catalysts based on nickel, cobalt, and platinum deposited on coal and silica gel are synthesized and investigated. Energy dispersive X-ray analysis (EDX) is performed to determine the distribution of metals in the bulk phase. The atomic ratio in subsurface layers is measured via X-ray photoelectron spectroscopy (XPS). It is shown that the concentration of metal on a surface can differ significantly from its content in the bulk phase. Profiles of the distribution of metal from the surface to the depth of a catalyst granule are constructed. Textural characteristics of the studied catalysts are obtained. A way of determining the number of active sites on a catalyst’s surface is proposed based on EDX, XPS, and the textural characteristics of a sample. The calculated numbers of metal atoms are compared to the amount of reactive hydrogen adsorbed on active centers. Results allow determination of the effect synthesis has on the content of active sites on the surface of a catalyst.