Quantity of Reduced Metal on the Surface of a Catalyst for Liquid-Phase Hydrogenation of Unsaturated Hydrocarbons

Key Points

• This research aims to determine how the surface metal quantity of catalysts affects their performance in hydrogenation reactions.
• Synthesis of catalysts based on nickel, cobalt, and platinum supported on carbon and silica gel
• Utilization of energy-dispersive X-ray analysis (EDX) for evaluating metal distribution
• Employment of X-ray photoelectron spectroscopy (XPS) to assess atomic ratios in the near-surface layer
• Construction of metal distribution profiles from surface to interior of catalyst granules
• Comparison of metal atom count with reactive hydrogen adsorption on active sites.
• Significant differences were found between metal concentration on the surface and in the bulk phase.
• Metal distribution profiles were successfully constructed, illustrating variation from surface to depth.
• The proposed method for determining active sites was validated based on EDX and XPS data.
• Evaluation of synthesis methods showed a direct influence on the number of active sites present on catalyst surfaces.

Abstract