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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
Source PublicationTOPICS IN CATALYSIS
Volume22Issue:1-2Pages:#REF!
Corresponding AuthorMeng, M (reprint author), Univ Sci & Technol China, Dept Chem Phys, Hefei 230026, Peoples R China.
SubtypeArticle; Proceedings Paper
AbstractThe 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.
KeywordPt/BaAl2O4-Al2O3 NOx storage EXAFS TPD mechanism
Subject AreaChemistry
DOI10.1023/A:1021480115825
Indexed BySCI
WOS SubjectChemistry, Applied ; Chemistry, Physical
WOS IDWOS:000179659600017
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Document Type期刊论文
Identifierhttp://ir.ihep.ac.cn/handle/311005/226228
Collection多学科研究中心
Recommended Citation
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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