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The study of XAFS for the NOx storage catalyst Pt/BaAl2O4-Al2O3
Li, XG; Meng, M; Lin, PY; Huang, ZJ; Fu, YL; Xie, YN; Hu, TD; 谢亚宁,胡天斗
2001
发表期刊ACTA PHYSICO-CHIMICA SINICA
卷号17期号:12页码:1072-1076
通讯作者Univ Sci & Technol China, Dept Chem Phys, Hefei 230026, Peoples R China ; Inst High Energy Phys, Synchrotron Radiat Lab, Beijing 100039, Peoples R China
摘要A series of Pt/BaAl2O4-Al2O3 NOx trap samples were prepared by coprecipitation-impregnation method. The supports BaAl2O4-Al2O3 were calcined at 800 degreesC and 1000 degreesC, respectively. X-ray Diffraction (XRD), X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure(EXAFS) were used to characterize the microcosmic structure of barium and platinum species in the samples. It is shown that the barium exists in the forms of BaAl2O4 and BaCO3 crystallites. With the decreasing of calcination temperature and barium content, the dispersion of BaAl2O4 phase becomes higher. Platinum in the samples mainly exists as small atomic clusters, which possess very high dispersion. In comparison with the standard compound of platinum, the magnitude for Pt-Pt coordination shell is significantly decreased, and the coordination distance is also shortened about 0.01 nm. All the results suggest that the BaAl2O4 crystallites should be the centers for NOx storage, while the fine-grained platinum species with high dispersion are deduced as the centers for the capture and oxidation of NOx species.
文章类型Article
关键词NOx Pt/BaAl2O4-Al2O3 storage XAFS
学科领域Chemistry
研究领域[WOS]Chemistry
DOI10.3866/PKU.WHXB20011204
URL查看原文
语种英语
WOS类目Chemistry, Physical
WOS记录号WOS:000172839700004
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被引频次:6[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/311005/239000
专题多学科研究中心
作者单位中国科学院高能物理研究所
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GB/T 7714
Li, XG,Meng, M,Lin, PY,et al. The study of XAFS for the NOx storage catalyst Pt/BaAl2O4-Al2O3[J]. ACTA PHYSICO-CHIMICA SINICA,2001,17(12):1072-1076.
APA Li, XG.,Meng, M.,Lin, PY.,Huang, ZJ.,Fu, YL.,...&谢亚宁,胡天斗.(2001).The study of XAFS for the NOx storage catalyst Pt/BaAl2O4-Al2O3.ACTA PHYSICO-CHIMICA SINICA,17(12),1072-1076.
MLA Li, XG,et al."The study of XAFS for the NOx storage catalyst Pt/BaAl2O4-Al2O3".ACTA PHYSICO-CHIMICA SINICA 17.12(2001):1072-1076.
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