Journal
RSC ADVANCES
Volume 5, Issue 61, Pages 49780-49790Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra07078c
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Funding
- NSFC [21177160, 21303263, 21477164]
- Beijing Nova Program [Z141109001814072]
- Specialized Research Fund for the Doctoral Program of High Education of China [20130007120011]
- Science Foundation of China University of Petroleum-Beijing [2462013YJRC13, 2462013BJRC003]
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Three-dimensionally ordered macroporous (3DOM) SiO2 was synthesized by a colloidal crystal template (CCT) method, and 3DOM SiO2-supported transition metal oxides catalysts were prepared by a facile incipient-wetness impregnation method. The as-prepared catalysts show well-defined three-dimensionally ordered macroporous structures. The transition metal oxides formed different sizes of nanoparticles and loaded onto 3DOM SiO2. The as-prepared catalysts show high catalytic activities for soot combustion. Among the studied catalysts, the 3DOM MnOx/SiO2 catalyst (molar ratio of Mn to Si is 1 : 4) shows the highest catalytic activity among the studied catalysts, e.g. T-10, T-50 and T-90 are 297, 355 and 393 degrees C, respectively, and (SCO2)-C-m is 95.5%. The catalytic performances of 3DOM SiO2-supported transition metal oxide catalysts are mainly controlled by three factors: the macroporous effects of the 3DOM structure, the redox properties of transition metal oxides and the sizes of transition metal oxide NPs. 3DOM SiO2-supported transition metal oxide catalysts are promising for practical applications in soot combustion owing to high activity and low cost.
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