内燃机工程2018，Vol.39Issue(2)：53-58,6.DOI:10.13949/j.cnki.nrjgc.2018.02.009
MnOx-CeO2复合氧化物催化氧化柴油机NO性能研究
Research on Catalytic Oxidation of NO from a Diesel Engine Using MnOx-CeO2Composite Oxides
摘要
Abstract
In order to research into the influence of MnOx-CeO2composite 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 sol-gel method.A combination of characterization techniques,namely X-ray diffraction(XRD),X-ray Photoelectron Spectroscopy(XPS)and H2Temperature 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-Al2O3catalysts 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.关键词
柴油机/溶胶凝胶法/MnOx-CeO2复合氧化物/NO氧化/氧空位Key words
diesel engine/sol-gel method/MnOx-CeO2composite oxides/NO oxidation/oxygen vacancy分类
能源科技引用本文复制引用
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):53-58,6.基金项目
国家自然科学基金项目(51676090) （51676090）
江苏省自然科学基金项目(BK20150513) （BK20150513）
江苏大学高级人才项目(14JDG152)National Natural Science Foundation of China (51676090) （14JDG152）
Natural Science Foundation of Jiangsu Province (BK20150513) （BK20150513）
Senior Personnel Program of Jiangsu University (14JDG152) （14JDG152）
