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Study on the properties and mechanisms for NOx storage over Pt/BaAl2O4-Al2O3 catalyst
Li, XG; Meng, M; Lin, PY; Fu, YL; Hu, TD; Xie, YN; Zhang, J; Hu TD(胡天斗); Xie YN(谢亚宁); Zhang J(张静)
2003
发表期刊TOPICS IN CATALYSIS
卷号22期号:1-2页码:#REF!
通讯作者Meng, M (reprint author), Univ Sci & Technol China, Dept Chem Phys, Hefei 230026, Peoples R China.
摘要The NOx storage catalyst Pt/BaAl2O4-Al2O3 was prepared by a coprecipitation-impregnation method. For fresh sample, the barium mainly exists as the BaAl2O4 phase except for some BaCO3 phase. The BaAl2O4 phase is the primary NOx storage phase of the sample. EXAFS and TPD were used for investigating the mechanism of NOx storage. It is found that two kinds of Pt sites are likely to operate. Site 1 is responsible for NO chemisorption and site 2 for oxidizing NO to nitrates and nitrites. When NO adsorbs on the sample below 200degreesC, it mainly chemisorbs in the form of molecular states. Such adsorption results in an increase of the coordination magnitude of Pt-O, and a decrease of that of Pt-Pt and Pt-Cl. The coordination distance of Pt-Pt, Pt-Cl and Pt-O also increases. When the adsorption occurs above 200degreesC, NO can be easily oxidized by O-2, and stored as nitrites or nitrates at the basic BaAl2O4. Site 2 is regenerated quickly. A high adsorption temperature is favorable for nitrate formation.
文章类型Article; Proceedings Paper
关键词Pt/BaAl2O4-Al2O3 NOx storage EXAFS TPD mechanism
学科领域Chemistry
DOI10.1023/A:1021480115825
收录类别SCI
WOS类目Chemistry, Applied ; Chemistry, Physical
WOS记录号WOS:000179659600017
引用统计
被引频次:61[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/226228
专题多学科研究中心
推荐引用方式
GB/T 7714
Li, XG,Meng, M,Lin, PY,et al. Study on the properties and mechanisms for NOx storage over Pt/BaAl2O4-Al2O3 catalyst[J]. TOPICS IN CATALYSIS,2003,22(1-2):#REF!.
APA Li, XG.,Meng, M.,Lin, PY.,Fu, YL.,Hu, TD.,...&张静.(2003).Study on the properties and mechanisms for NOx storage over Pt/BaAl2O4-Al2O3 catalyst.TOPICS IN CATALYSIS,22(1-2),#REF!.
MLA Li, XG,et al."Study on the properties and mechanisms for NOx storage over Pt/BaAl2O4-Al2O3 catalyst".TOPICS IN CATALYSIS 22.1-2(2003):#REF!.
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