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- Title
Effects of reductants and steam on the palladium-catalyzed reduction of NO.
- Authors
WU Bingxian; WANG Chengxiong; XU Ying; QIN Qinggao; GUO Lü; ZHAO Yunkun
- Abstract
Besides controlling NOx emissions, reducing the emissions of secondary pollutants including N2O and NH3 is required to meet the strict emission regulations. In order to understand the effects of exhaust gas components on catalytic NOx reduction, NO conversion as well as the formation features of N2O and NH3 were tested on a catalytic activity simulation evaluation device and the catalytic reaction was carried out by using a self-prepared three-way catalyst under different reductants and at different concentrations of CO and steam. It was found that N2O formation was significantly ascribed to the catalytic reduction of NO by CO, because of the synergistic effect of active oxygen species on the catalyst surface. And the amounts of NH3 formation were positively correlated with the reaction temperature in the range of 150-400 °C. Introducing water vapour led to an increase in N2O and NH3 contents and the adsorption of H2O molecules on the catalyst surface inhibited the consumption of reactive oxygen species. Increasing CO concentration would reduce N2O formation but promote NH3 generation.
- Subjects
REDUCING agents; WATER vapor; CATALYTIC reduction; STEAM reforming; REACTIVE oxygen species; CATALYTIC activity; WASTE gases; CLASS B metals; POLLUTANTS
- Publication
Precious Metals / Guijinshu, 2024, Vol 45, Issue 2, p52
- ISSN
1004-0676
- Publication type
Article