Preparation of ordered mesoporous nanocrystalline ceria and ceria-zirconia for soot oxidation

Abstract

Ordered mesoporous ceria and ceria-zirconia with high specific surface area were prepared by nanocasting of a mesoporous silica KIT-6 template and used for soot oxidation. The as-synthesized ordered mesoporous ceria and ceria-zirconia were characterized by XRD, TEM,Nitrogen adsorption-desorption,Raman spectroscopy, and XRF. The results indicate that mesoporous ceria and ceria-zirconia possess highly ordered mesoporous structure, and exhibited excellent catalytic performance in soot oxidation. T ₅₀ of mesoporous ceria and ceria-zirconia are 475 and 470 °C, respectively.The high catalytic activity of mesoporous materials can be attributed to the mesoporous structure and small crystallite size. Moreover, aged mesoporous materials exhibit high catalytic activity.

Keywords

mesoporous ceria / mesoporous ceria-zirconia / soot oxidation / diesel pollution control

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