High catalytic activity of PdOx/MnO2 for CO oxidation and importance of oxidation state of Mn

Jong Soo Park, Dong Sup Doh, Kwan Young Lee

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Catalytic oxidation is used as the most effective to remove CO in the exhaust gases from automobiles and power plants. PdOx/MnOx was examined as a catalyst for CO oxidation using a conventional flow reactor at 50°-150°C. In the reaction conditions of GHSV of 1.22 x 105/hr and CO concentration of 2000 ppm, PdOx/MnO2 showed higher catalytic activity compared with PdOx/Mn2O3, which was previously reported as an effective catalyst due to the cooperative action of palladium and Mn2O3 for this reaction. The reason for higher activity of PdOx/MnO2 than PdOx/Mn2O3 was studied using TPR and XPS studies. TPR showed that PdOx/MnO2 could be reduced by CO at much lower temperature than PdOx/Mn2O3. XPS showed that the valence of manganese in the PdOx/MnO2 was between 4+ and 3+, which was higher than that of manganese in the PdOx/Mn2O3 catalyst of which the valence was between 3+ and 2+. The readiness of MnO2 to be reduced with maintaining a higher oxidation state showed higher CO oxidation activity than Mn2O3 as support for PdOx.

Original languageEnglish
Pages (from-to)127-131
Number of pages5
JournalTopics in Catalysis
Volume10
Issue number1-2
Publication statusPublished - 2000 Mar

Keywords

  • CO oxidation
  • PdO/MnO
  • Redox properties

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)

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