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《JOURNAL OF BEIJING POLYTECHNIC UNIVERSITY》 2000-02
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The Synergestic Effect of Lanthanium-Cerium Ratio on Catalytic Properties of Pd-TWC

Jin Jun; Wang Dao; Wu Shaohua; Ye Qing; Zhou Kebin (College of Environment and Energy Engineering, Beijing Polytechnic University, Beijing, 100022 )  
The relationship between the activity of La-Ce Catalysts and molar ratio of La-Ce was studied in the paper. These catalysts were prepared by impregnation method using cordierite holeycomb monoliths obtained from Yixing coated by γ-Al_2O_3 as carrier. The effect of the molar ratio of La-Ce on the property of Pd-TWC was also studied. consults showed that the catalytic astivity of Pd-TWC in Purifying CO, HC and NO varied with the ratio of La-Ce. The best catalytic activity was obtained when the ratio was l: 4. Under this circumstances, the amount of resodual oxygen on its surface was largest. XPS results showed that Ce~(4+) coexited with Ce~(3+) and the relative amount of Ce~(4+) is the biggest in all the samples and equaled 60%. La and Ce had a synergestic action on improving catalytic astivity of Pd-TWC.
【Fund】: 北京市教委资助!97051200
【CateGory Index】: O643
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