Pt/Zeolite Catalysts for Soot Oxidation: Influence of Hydrothermal Aging
Pt/Zeolite Catalysts for Soot Oxidation: Influence of Hydrothermal Aging
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DOI：
10.1021/acs.jpcc.5b04882
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发表时间：
2015-07
影响因子：
3.7
通讯作者：
Shuang Liu;Xiaodong Wu;Hui Luo;D. Weng;Rui Ran
中科院分区：
文献类型：
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作者：
Shuang Liu;Xiaodong Wu;Hui Luo;D. Weng;Rui Ran
Developments in diesel engines and gasoline direct injection (GDI) engines have spawned the requirement of soot oxidation catalysts that work well in both NO + O2 and O2. In this study, we found that supporting Pt on zeolites such as H-ZSM5 and USY may receive better soot oxidizers than commercial Pt/Al2O3 catalyst. Durability tests indicate that, even after the hydrothermal aging at 800 °C, the aged Pt/H-ZSM5 is still a better soot oxidizer than Pt/Al2O3 in NO + O2, and the aged Pt/USY exhibits the best activity in O2. Further explorations reveal that the NO2 preferential adsorption on soot is dependent on acid sites both inside and outside micropores of zeolites, while the decomposition of surface oxygenated complexes (SOCs) can be promoted by strong acid sites on the external surface. These two factors contribute mainly to the high activity of the Pt/zeolite catalysts in NO + O2 and O2, respectively. Considering a relatively high external surface area is always essential to inhibiting the severe sinter...
