期刊
RSC ADVANCES
卷 5, 期 111, 页码 91734-91741出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c5ra17328k
关键词
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资金
- Natural Science Foundation of China [21107096, 21506194]
- Zhejiang Provincial Natural Science Foundation of China [Y14E080008, Y16B070011]
- Commission of Science and Technology of Zhejiang province [2013C03021]
- Specialized Research Fund for the Doctoral Program of Higher Education [20133317110004]
MnOx-CeO2 (Mn/Ce = 0.15/0.85) mixed oxide materials supported on ZrO2, Al2O3, and TiO2 were prepared by citrate sol-gel method to prevent the CeO2-based oxide catalyst from sintering during soot combustion reaction. The materials were characterized using XRD, BET method, HRTEM, H-2-TPR, and XPS. Results indicate that the MnOx-CeO2/TiO2 catalyst is rapidly sintered at 800 degrees C because of the TiO2 phase change from anatase to rutile. By contrast, MnOx-CeO2 catalysts supported on Al2O3 and ZrO2 show high thermal stability. After aging at 800 degrees C for 10 h, the MnOx-CeO2 crystalline structure remained highly dispersed on the carrier. Particularly with the ZrO2 carrier, the amount of surface oxygen species and redox properties of MnOx-CeO2 can be well-maintained for the synergistic effect of CeO2 and ZrO2 in high temperature environments. Good agreement is found between the low-temperature redox property (200 degrees C to 400 degrees C) and the soot combustion activity of the catalysts.
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