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  • Title: Modification of CeO2-ZrO2 catalyst by potassium for NOx-assisted soot oxidation.
    Author: Weng D, Li J, Wu X, Si Z.
    Journal: J Environ Sci (China); 2011; 23(1):145-50. PubMed ID: 21476354.
    Abstract:
    Potassium-modified ceria-zirconia catalyst was synthesized by wetness impregnation method. The ageing treatment was performed in static air at 800degrees C 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, NO(x)-temperature programmed desorption and soot-temperature programmed oxidation measurements. By introduction of potassium, the maximum soot oxidation rate temperature (T(m)) of the ceria-zirconia based catalyst decreased from 525 to 428 degrees C in the presence of NO under a loose contact mode. The shift of T(m) of the K-modified catalyst after ageing is only 15 degrees C. The enhanced activity of the aged catalyst mainly lies in the promotional effect of potassium on the NO(x)/oxygen storage capacity as well as the soot-catalyst contact.
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