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Citation: Li Xin-Gang, Meng Ming, Lin Pei-Yan, Huang Zhi-Jian, Fu Yi-Lu, Xie Ya-Ning, Hu Tian-Dou. The Study of XAFS for the NOx Storage Catalyst Pt/BaAl₂O₄-Al₂O₃[J]. Acta Physico-Chimica Sinica doi: 10.3866/PKU.WHXB20011204 shu

The Study of XAFS for the NOx Storage Catalyst Pt/BaAl₂O₄-Al₂O₃

1.
Department of Chemical Physics, University of Science and Technology of China, Hefei　230026;Synchrotron Radiation Laboratory, Institute of High Energy Physics, Beijing　100039

Received Date: 16 April 2001
Available Online: 15 December 2001

A series of Pt/BaAl2O4-Al2O3 NOx trap samples were prepared by coprecipitation-impregnation method. The supports BaAl2O4-Al2O3 were calcined at 800 ℃ and 1000 ℃, 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.
- NO_x;Pt/BaAl₂O₄-Al₂O₃;Storage;XAFS
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沈阳化工大学材料科学与工程学院沈阳 110142

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The Study of XAFS for the NOx Storage Catalyst Pt/BaAl2O4-Al2O3

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通讯作者: 陈斌, bchen63@163.com

The Study of XAFS for the NOx Storage Catalyst Pt/BaAl₂O₄-Al₂O₃