• Low temperature oxidation of CO using alkali- and alkaline-earth metal-modified ceria-supported metal catalysts: a review

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    • Keywords

       

      CO oxidation; CeO$_2$ modification; noble metal; non-noble metal; alkali metal; alkaline-earth metal.

    • Abstract

       

      The present review devoted to the complete oxidation of CO using alkali- and alkaline-earth metal (AM/AEM)-modified ceria supported/mixed with noble metal and non-noble metal (NM). The AM/AEM-modified Ce supported/mixed with noble metal showed comparable CO oxidation with unmodified catalyst. However, AM/AEM modified NM showed higher CO oxidation at lower temperature compared to the unmodified catalyst. The AM and AEM modifications were responsible for the formation of oxygen vacancies in Ce, which leads to the decrease in the CO and O$_2$ activation barrier. The dissociative oxygen adsorption on AM/AEM-modified Ce-supported/mixed with NM favours the CO oxidation at a lower temperature. However, AM/AEM-modified Ce-supported/mixed with noble metal showed CO adsorption with formation of superoxy and peroxy species, which leads to the comparable oxidation activity. The plausible mechanism for CO oxidation is explained in detail with correlation to the characterizations.

    • Author Affiliations

       

      JYOTI WAIKAR PAVAN MORE1

      1. Department of Chemistry, Institute of Chemical Technology, Mumbai 400019, India
    • Dates

       
  • Bulletin of Materials Science | News

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