Electrochemical promotion of methane oxidation on Pd catalyst-electrodes deposited on Y2O3-stabilized-ZrO2
| Autor: | M. Makri, S. Brosda, F. Matei, F.M. Sapountzi, C.G. Vayenas, C. Jiménez-Borja, José Luis Valverde, Fernando Dorado, B. Delgado, D. Ciuparu |
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| Rok vydání: | 2012 |
| Předmět: |
Materials science
Process Chemistry and Technology Inorganic chemistry Electrochemistry Catalysis Methane law.invention Metal chemistry.chemical_compound chemistry law visual_art Oxidizing agent Anaerobic oxidation of methane Electrode visual_art.visual_art_medium Calcination General Environmental Science |
| Zdroj: | Applied Catalysis B: Environmental. 128:48-54 |
| ISSN: | 0926-3373 |
| DOI: | 10.1016/j.apcatb.2012.02.011 |
| Popis: | The catalytic activity of Pd/YSZ and Pd-CeO 2 /YSZ catalysts prepared via organometallic paste calcination or via wet impregnation has been investigated under conditions of excess in oxygen and at temperatures from 250 to 450 °C. The catalyst-electrodes were characterized via XRD, SEM, in situ electrical conductivity measurements, electrochemical current–potential curves and catalytic kinetic measurements. The impregnated Pd films were found to be more active with light-off temperatures of 270 °C vs. 320 °C for metal paste catalysts. Only the impregnated catalyst could be electropromoted at temperatures above 320 °C. The Pd-CeO 2 /YSZ catalyst exhibited high catalytic activity but could not be electropromoted. Co-feeding of ethylene or pre treatment in oxidizing ethylene–oxygen gas mixtures enhances the rate of methane conversion in comparison to non-treated samples and allows electrochemical promotion of the methane oxidation at temperatures as low as 320 °C. The reason for this behavior is discussed in view of detailed pre and post surface characterization and in situ electrochemical measurements. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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