| 王攀，孙川,张博,罗鹏,雷利利.MnOx-CeO2复合氧化物催化氧化柴油机NO性能研究[J].内燃机工程,2018,39(2):53-58. |
| Research on catalytic oxidation of NO from diesel engine using MnOx-CeO2，composite oxides |
| DOI： |
| Key Words:diesel engine solgel method MnOx-CeO2 composite oxides NO oxidation oxygen vacancy |
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| Abstract:In order to research into the influence of MnOx-CeO2 composite oxides on catalytic oxidation of NO from diesel engine, a series of xMn10Ce/γ-Al2O3（x=5, 6, 7, 8) catalysts with different Mn/Ce mole ratio were prepared by the solgel method. A combination of characterization techniques, namely X-ray diffraction(XRD), X-ray Photoelectron Spectroscopy（XPS) and H2 Temperature Programmed Reduction（H2-TPR), was adopted to analysis its phase structure, element valence and reducibility, respectively. Results illustrate that the grain size of ceria gradually increases with the rise in Mn content, and the addition of appropriate amount of Mn is also beneficial to the increase of the number of Mn4+ in the catalyst, so as to promote the oxidation of NO. When x is equal to 6, the catalyst has the best redox properties. Finally, the impact of different Mn/Ce mole ratio on NO oxidation performance of xMn10Ce/γ-Al2O3 catalysts was investigated based on a simulated gas bench test. Test results show that at a temperature of 350 ℃, the time required for NO concentration to reach saturation and the reaction rate are nonlinear with the amount of Mn added when the temperature is between 250 ℃ and 450 ℃, the NO oxidation properties of 6Mn10Ce/γ-Al2O3 are the best. At this time, the timing required for NO concentration to reach stability is only 4 min, but it is extended to 6 min at 450 ℃, which is mainly the result of a combination of the thermodynamic equilibrium as well as the amount of active oxygen and the gradual saturation of oxygen vacancy during the reaction. |
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