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<p>Silver nanoparticles are highly active for low-temperature CO oxidation reactions. Herein, we report the synthesis of Ag nanoparticles dispersed over mesoporous SiO<sub>2</sub> via a green approach. The Ag nanoparticles were dispersed over mesoporous silica using bay leaf extract to prepare a 2% Ag/SiO<sub>2</sub> (G) catalyst. The formation of the catalyst was confirmed by UV-Vis spectroscopy, transmission electron microscopy and X-ray diffraction analysis. The activity of the 2% Ag/SiO<sub>2</sub> (G) catalyst was tested for CO oxidation reaction in a packed bed reactor. The catalyst showed excellent activity for low-temperature CO oxidation, and 100% conversion was achieved at 125 <sup>o</sup>C. The higher conversion and stable activity for 100&#xa0;h is ascribed to the strong metal support interaction, homogenous dispersion of nano-particles and formation of easily reducible metal oxides. The strong metal support interaction is confirmed by temperature programmed reduction analysis.</p>

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Green Synthesis of Ag/SiO2 Catalyst for its Application in CO-Oxidation

  • 期刊论文

  • 发表日期：

    2025年2月12日

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  • Subhasis Pati,
  • Ashok Jangam

摘要

Silver nanoparticles are highly active for low-temperature CO oxidation reactions. Herein, we report the synthesis of Ag nanoparticles dispersed over mesoporous SiO2 via a green approach. The Ag nanoparticles were dispersed over mesoporous silica using bay leaf extract to prepare a 2% Ag/SiO2 (G) catalyst. The formation of the catalyst was confirmed by UV-Vis spectroscopy, transmission electron microscopy and X-ray diffraction analysis. The activity of the 2% Ag/SiO2 (G) catalyst was tested for CO oxidation reaction in a packed bed reactor. The catalyst showed excellent activity for low-temperature CO oxidation, and 100% conversion was achieved at 125 oC. The higher conversion and stable activity for 100 h is ascribed to the strong metal support interaction, homogenous dispersion of nano-particles and formation of easily reducible metal oxides. The strong metal support interaction is confirmed by temperature programmed reduction analysis.