Preparation methods and thermal stability of Ba-Mn-Ce oxide catalyst for
NOx-assisted soot oxidation |
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Authors: | Xiaodong Wu Fan Lin Lei Wang Duan Weng and Zhou Zhou |
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Institution: | Laboratory of Advanced Materials, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China. E-mail: wuxiaodong@tsinghua.edu.cn |
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Abstract: | Manganese oxide-loaded and -doped ceria as well as the corresponding barium-modified oxide catalysts were prepared for soot
oxidation in the presence of NOx, and were characterized by using X-ray diffraction, Brunauer-Emmett-Teller and NO temperatureprogrammed
oxidation measurements. The activity of catalyst depended strongly on the NO2 production capacity, and the importance
of surface nitrates was weakened without heat transfer limitations. The formation of perovskite-type oxides after the high-temperature
calcination caused the loss of NOx storage capacity for the Ba-modified catalysts, but did not seem to affect the NO oxidation activity
obviously. The addition of barium did not prevent the phase separation of MnOx-CeO2 solid solutions, whereas it inhibited the sintering
of oxide crystallites effectively. This, as well as the relatively high surface area, resulted in a small increase in soot oxidation temperature
for the thermally aged Ba/Mn-Ce catalyst. |
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Keywords: | manganese oxide ceria barium soot oxidation NO2 ageing |
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