Reduction of nitrogen oxides over Ir/YSZ electrochemical catalysts
| Autor: | Philippe Vernoux, François Gaillard, Alain Billard, R. Karoum |
|---|---|
| Přispěvatelé: | Institut de recherches sur la catalyse et l'environnement de Lyon (IRCELYON), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC) |
| Jazyk: | angličtina |
| Rok vydání: | 2007 |
| Předmět: |
Inorganic chemistry chemistry.chemical_element 02 engineering and technology 010402 general chemistry Heterogeneous catalysis 01 natural sciences 7. Clean energy Propene Catalysis NO chemistry.chemical_compound Sputtering Ir NEMCA effect Iridium General Environmental Science Selective catalytic reduction Process Chemistry and Technology [CHIM.CATA]Chemical Sciences/Catalysis Sputter deposition 021001 nanoscience & nanotechnology Electrochemical promotion of catalysis [SDE.ES]Environmental Sciences/Environmental and Society 0104 chemical sciences YSZ chemistry Electrochemical catalyst EPOC 0210 nano-technology Stoichiometry Magnetron sputtering |
| Zdroj: | Applied Catalysis B: Environmental Applied Catalysis B: Environmental, Elsevier, 2007, 73, pp.73-83. ⟨10.1016/j.apcatb.2006.06.009⟩ |
| ISSN: | 0926-3373 |
| DOI: | 10.1016/j.apcatb.2006.06.009⟩ |
| Popis: | International audience; This study has shown that Ir/YSZ electrochemical catalysts can reach high catalytic activity for the SCR of NO by propene in the presence of oxygen. Under stoichiometric conditions, porous and thin (about 40 nm) Ir film achieves N2 yield higher than 80% between 350 and 500 °C. However, iridium films require on-stream treatment at 500 °C in order to develop their catalytic efficiency by increasing Ir particles size and establishing an ideal Ir0/IrO2 ratio. Under lean-burn conditions, the same sample presents high and durable NO conversion at 500 °C. These results confirm that magnetron sputtering is a suitable technique for synthesis of effective thin catalytic films. Furthermore, it was found that NO reduction by propene can be electrochemically promoted on Ir/YSZ electrochemical catalysts. This promotion exhibits an electrophobic NEMCA effect, the reaction rate increasing when a positive polarisation is applied. The electropromotion efficiency was found to be structure sensitive. |
| Databáze: | OpenAIRE |
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