NO_x storage-reduction over combined catalyst Mn/Ba/Al₂O₃–Pt/Ba/Al₂O₃

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• 作者：Jianhua Xiao ; Xuehui Li ; Sha Deng ; Furong Wang ; Lefu Wang
• 关键词：NO_x storage-reduction ; Lean burn ; Pt/Ba/Al₂O₃ ; Mn/Ba/Al₂O₃ ; Combined catalyst
• 刊名：Catalysis Communications
• 出版年：2008
• 期刊代码：12_15667367
• 类别：ce
• 出版时间：20 March 2008
• 卷：9
• 期：5
• 页码：563-567
• 文件大小：213 K

摘要

Mn/Ba/Al₂O₃, Pt/Ba/Al₂O₃ and their combined catalyst for NO_x storage-reduction by propylene were investigated. The results showed that Mn/Ba/Al₂O₃ exhibited good catalytic activity for NO oxidation-storage under lean burn condition. When Pt/Ba/Al₂O₃ was mixed with Mn/Ba/Al₂O₃ in equal weight proportion, the NO_x conversion between 250 °C and 500 °C under the dynamic lean-rich burn conditions increased, and the maximum NO_x conversion increased from 82.0%to 90.8%at 400 °C. The combined catalyst showed higher catalytic activity and better stability in the presence of 25 ppm SO₂ in comparison to Pt/Ba/Al₂O₃. XRD and XPS characterizations of Mn/Ba/Al₂O₃ indicated that MnO₂ and Mn₂O₃ disperse on the surface, while BaMnO₃ exits in bulk phase.