Textural–structural properties and soot oxidation activity of MnOx-CeO2 mixed oxides
Textural–structural properties and soot oxidation activity of MnOx-CeO2 mixed oxides
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DOI：
10.1016/j.catcom.2010.10.019
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发表时间：
2011-01
影响因子：
3.7
通讯作者：
Xiaodong Wu;Shuang Liu;D. Weng;Fangjian Lin
中科院分区：
文献类型：
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作者：
Xiaodong Wu;Shuang Liu;D. Weng;Fangjian Lin
采用溶胶-凝胶法制备了一系列mnox - ceo_2混合氧化物，并在不同温度下进行煅烧。在松散接触条件下，测定了不同NO浓度下烟尘氧化活性。观察到活性与催化剂表面积明显相关的准抛物线曲线。由于比表面积低于8m2/g，混合氧化物的分离和烧结导致no2的可用性限制了烟尘的氧化。对于高表面积催化剂，速率决定步骤变为no2与煤烟的反应。
A series of MnOx-CeO2mixed oxides were prepared using a sol-gel method followed by calcinations at various temperatures. The soot oxidation activities were measured in different NO concentrations under loose contact conditions. A quasi-parabolic curve is observed for the apparent dependency of activity on the catalyst surface area. As the surface area is below 8m2/g, the soot oxidation is limited by the availability of NO2due to the separation and sintering of the mixed oxides. The rate-determining step turns to be NO2reaction with soot for the high-surface-area catalysts.