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 language | English |
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Pages (from-to) | 127-131 |
Number of pages | 5 |
Journal | Topics in Catalysis |
Volume | 10 |
Issue number | 1-2 |
DOIs | |
Publication status | Published - 2000 Mar |
Keywords
- CO oxidation
- PdO/MnO
- Redox properties
ASJC Scopus subject areas
- Catalysis
- Chemistry(all)