Acta Phys. -Chim. Sin. ›› 2005, Vol. 21 ›› Issue (08): 840-845.doi: 10.3866/PKU.WHXB20050804

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Catalytic Performance of K-Ce0.5Zr0.5O2 Catalysts for Soot Combustion

ZHU Ling; WANG Xue-zhong; YU Jun-jie; HAO Zheng-ping   

  1. Research Center of Eco-environmental Sciences, Chinese Academic Sciences, Beijing 100085; Chinese Research Academy of Environmental Sciences, Beijing 100012
  • Received:2004-12-06 Revised:2005-01-19 Published:2005-08-15
  • Contact: HAO Zheng-ping

Abstract: xKNO3-Ce0.5Zr0.5O2 catalysts were prepared by incipient-wetness impregnation method, and the catalytic activities for the soot combustion were studied using TPO. XRD, BET, FT-IR and XPS were used to investigate the influences of KNO3 concentration on the catalytic activities for soot combustion. It was found that the KNO3 had great effect on the surface area and the chemical environment. Compare with Ce0.5Zr0.5O2, the catalytic activities of xKNO3-Ce0.5Zr0.5O2 for soot combustion were improved significantly; the catalyst with x=0.5 had the best catalytic performance, on which Ti and Tp were 290 ℃ and 360 ℃, respectively. The results suggested that the formation of K2CO3 and molten KNO3 phase during the reaction course promoted the catalytic activities obviously.

Key words: Ce0.5Zr0.5O2, KNO3, Soot, Catalytic combustion