Performance of NOx Storage and Reduction over Au/Al2O3/Mn2O3 Catalyst at Low Temperatures

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Abstract

A series of the Au/Al₂O₃/Mn₂O₃ catalysts with different Au loadings were prepared by the mechanical mixing method, and their catalytic activities on the NO_x storage-reduction (NSR) were studied. Results showed that the Au loading had the significant influence on the NSR activity. The catalyst showed very poor NSR activity when the Au loading was less than 1.0%. The reason might be that the low Au loading with a high gold dispersion would lead to a strong metal-support interaction over the Au/Al₂O₃/Mn₂O₃ catalyst. As a result, the gold oxides were difficultly reduced to Au⁰ at 150℃. Contrarily, the catalyst showed the much better NSR activity when the Au loading was above 1.0%. It is because the size of the Au particles increased with the increase of Au loading, which consequently induced the weaker metal-support interaction as compared with the low Au loading catalysts. Thus, the gold oxides could be readily reduced to Au⁰ at 150℃. Herein, the Au/Al₂O₃/Mn₂O₃ catalyst with the 2.0% Au loading presented the best NSR performance: the NO_x conversion and the N₂ selectivity could reach 49.6% and 71.9%, respectively.

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	Articles by authors
	Dong Hongwen
	Guo Li
	Li Xingang

Keywords： gold catalysts； Mn₂O₃； low temperature； NO_x storage and reduction； lean-burn technology； metal-support interaction

Received 2014-04-10;

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Dong Hongwen, Guo Li, Li Xingang.Performance of NO_x Storage and Reduction over Au/Al₂O₃/Mn₂O₃ Catalyst at Low Temperatures[J] Chemcial Industry and Engineering, 2016,V33(3): 8-12,44

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