Modification of Ce02-ZrO2 catalyst by potassium for NOx-assisted soot oxidation |
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| Authors: | Duan Weng Jia Li Xiaodong Wu Zhichun Si |
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| Affiliation: | State Key Laboratory of New Ceramics f, Fine Process, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China |
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| Abstract: | Potassium-modified ceria-zirconia catalyst was synthesized by wetness impregnation method. The ageing treatment was performed in static air at 800℃ for 20 hr to evaluate the thermal stability of the catalyst. The catalysts were characterized by X-ray diffraction,BET surface area, oxygen storage capacity, NOx-temperature programmed desorption and soot-temperature programmed oxidation measurements. By introduction of potassium, the maximum soot oxidation rate temperature (Tm) of the ceria-zirconia based catalyst decreased from 525 to 428℃ in the presence of NO under a loose contact mode. The shift of Tm of the K-modified catalyst after ageing is only 15℃. The enhanced activity of the aged catalyst mainly lies in the promotional effect of potassium on the NOx/oxygen storage cacity as well as the soot-catalyst contact. |
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| Keywords: | CeO2-Zr02 mixed oxides potassium soot combustion NOx storage oxygen storage capacity |
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