Thermal H-2-treatment effects on CO/CO2 conversion over Pd-doped CeO2 comparison with Au and Ag-doped CeO2
- Thermal H-2-treatment effects on CO/CO2 conversion over Pd-doped CeO2 comparison with Au and Ag-doped CeO2
- 손영구; 박요한; 김석규; 프라드한[프라드한]
- CO OXIDATION REACTION; CARBON-MONOXIDE OXIDATION; LOW-TEMPERATURE; CATALYTIC-PROPERTIES; PREFERENTIAL OXIDATION; PALLADIUM CATALYSTS; ALCOHOL OXIDATION; AU/TIO2 CATALYST; OXYGEN VACANCIES; AG/CEO2 CATALYST
- Issue Date
- REACTION KINETICS MECHANISMS AND CATALYSIS, v.113, no.1, pp.85 - 100
- CO oxidation to CO2 by Pd-CeO2 catalysts was tested by temperature-programmed mass spectrometry for as-prepared and thermal H-2-treated Pd-doped CeO2 catalysts, compared with those of Ag and Au-doped CeO2. For the as-prepared samples, the oxidation rate and the T-10 % (the temperature at 10 % CO conversion) occurred in the order of Au a parts per thousand Pd > Ag a parts per thousand << undoped in the 1st CO oxidation run, while in the 2nd run, the order became Au > Pd > Ag a parts per thousand << undoped. For the thermal H-2-treated samples, the order became Pd > Au > Ag > undoped and Au > Pd > Ag > undoped in the 1st and 2nd CO oxidation runs, respectively. The T-10 % in the 2nd run commonly occurred at much lower temperatures for the metal-doped CeO2 upon achieving good metal-oxide interfacial contact during the 1st run. The T-10 % of undoped CeO2 was the most significantly affected by the thermal treatment effects while those of metal-doped CeO2 catalysts were not greatly affected by the thermal H-2-treatment. Based on these findings, the metal-support interaction/interface is more important than the surface area, Au (88 m(2)/g) > Ag (59 m(2)/g) a parts per thousand Pd a parts per thousand undoped.
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