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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 ℃,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.
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. Results of mesoporous ceria and ceria-zirconia possess highly ordered mesoporous structure, and demonstrated 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. More than, aged mesoporous materials exhibit high catalytic activity.