Modification of CeO2-ZrO2 catalyst by potassium for NOx-assisted
soot oxidation |
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| Authors: | Duan Weng Jia Li Xiaodong Wu and Zhichun Si |
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| Institution: | State Key Laboratory of New Ceramics & Fine Process, Department of Materials Science and Engineering, Tsinghua University,
Beijing 100084, China. E-mail: duanweng@tsinghua.edu.cn,State Key Laboratory of New Ceramics & Fine Process, Department of Materials Science and Engineering, Tsinghua University,
Beijing 100084, China.,State Key Laboratory of New Ceramics & Fine Process, Department of Materials Science and Engineering, Tsinghua University,
Beijing 100084, China. and State Key Laboratory of New Ceramics & 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°C for 20 hr to evaluate the thermal stability of the catalyst. The catalysts were characterized by X-ray di raction,
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°C in the presence of NO under a loose contact mode. The shift of Tm of the K-modified catalyst after ageing
is only 15°C. The enhanced activity of the aged catalyst mainly lies in the promotional e ect of potassium on the NOx/oxygen storage
capacity as well as the soot-catalyst contact. |
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| Keywords: | CeO2-ZrO2 mixed oxides potassium soot combustion NOx storage oxygen storage capacity |
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