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<p>The influence of the type of carbon support on the catalytic activity of Ru/graphitized carbon systems in carbon dioxide methanation was evaluated. Four partly graphitized carbons with varying surface areas (from 50 to 1417 m<sup>2</sup>/g) were used as supports. The prepared samples were characterized by N<sub>2</sub> physisorption, TG-MS studies, H<sub>2</sub>-TPR, CO<sub>2</sub>-TPD, XRD, XAS, TEM/STEM, Raman spectroscopy and CO chemisorption. Both the mode of particle size distribution and the dispersion of the active phase clearly depend on the carbon texture; dispersion changes from 27% to almost 90% with increasing carbon support surface area. The degree of support graphitization affects its resistance to undesired methanation under reaction conditions. The activity tests conducted in a model H<sub>2</sub>–rich stream with very low CO<sub>2</sub> concentration (1 vol% CO<sub>2</sub>) show that the catalysts exhibit good activity, achieving a 20% conversion of CO<sub>2</sub> at a temperature of 270&#xa0;°C. The increase of the average Ru particle size leads to about sevenfold increase in the CO<sub>2</sub> conversion and a nearly 20-fold increase in TOF values. The catalytic activity or Ru/carbon catalysts is also associated with the presence of basic sites on their surface.</p>

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Catalytic CO2 Methanation Over Modified Carbon-Supported Ruthenium: The Influence of the Support Type on the Properties and Activity of the Catalyst

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年7月10日

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  • Elżbieta Truszkiewicz,
  • Katarzyna Klimaszewska,
  • Eliza Gauze,
  • Zuzanna Gronkiewicz,
  • Andrzej Ostrowski,
  • Arkadiusz Gertych,
  • Dominik Wierzbicki,
  • Ivo Alxneit

摘要

The influence of the type of carbon support on the catalytic activity of Ru/graphitized carbon systems in carbon dioxide methanation was evaluated. Four partly graphitized carbons with varying surface areas (from 50 to 1417 m2/g) were used as supports. The prepared samples were characterized by N2 physisorption, TG-MS studies, H2-TPR, CO2-TPD, XRD, XAS, TEM/STEM, Raman spectroscopy and CO chemisorption. Both the mode of particle size distribution and the dispersion of the active phase clearly depend on the carbon texture; dispersion changes from 27% to almost 90% with increasing carbon support surface area. The degree of support graphitization affects its resistance to undesired methanation under reaction conditions. The activity tests conducted in a model H2–rich stream with very low CO2 concentration (1 vol% CO2) show that the catalysts exhibit good activity, achieving a 20% conversion of CO2 at a temperature of 270 °C. The increase of the average Ru particle size leads to about sevenfold increase in the CO2 conversion and a nearly 20-fold increase in TOF values. The catalytic activity or Ru/carbon catalysts is also associated with the presence of basic sites on their surface.