Mn-Ce/γ-Al_2O_3催化剂对柴油机碳烟的催化燃烧性能影响  

Effect of Mn-Ce/γ-Al_2O_3 Catalysts on Catalytic Combustion Performance of Diesel Engine Soot

作　　者：雷利利[1] 殷俊晨 宋金瓯[2] 罗鹏[1] 王攀[1] LEI Lili YIN Junchen SONG Jin＇on LUO Peng WANG Pan(School of Automotive and Traffic Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, P. R. China State Key Laboratory of Engines, Tianjin University, Tianjin 300072, P. R. China)

机构地区：[1]江苏大学汽车与交通工程学院,江苏镇江212013 [2]天津大学内燃机燃烧学国家重点实验室,天津300072

出　　处：《重庆交通大学学报（自然科学版）》2016年第6期163-167,共5页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：国家自然科学基金项目(51206068);江苏省自然科学基金项目(BK2015040369);天津大学内燃机燃烧学国家重点实验室开放基金资助项目(k15-07)

摘　　要：为了验证Mn-Ce/γ-Al2O3催化剂对碳烟的催化燃烧性能的影响,采用柠檬酸络合法和溶胶-凝胶法制备了一系列不同锰、铈摩尔比的x Mny Ce/γ-Al2O3（x=4,6,8,10,y=10）催化剂,并利用X射线衍射仪、扫描电子显微镜、能谱仪和透射电子显微镜对其性能进行表征,结果表明,MnO2和CeO2的粒径变化范围为520 nm。Mn在催化剂中主要以MnO2出现,当x≥6时,有部分Mn2O3分散在催化剂表面。当x=8时,CeO2晶粒尺寸和分散性最好。通过热重分析仪评价了催化剂对碳烟燃烧性能的影响。试验结果表明：随着x的增加,催化剂的T10温度呈现先降低后升高的趋势,8Mn10Ce/γ-Al2O3催化剂的T10温度最低,为320.9℃,可以显著降低碳烟的起燃温度,具有最好的碳烟催化燃烧性能。In order to investigate the effect of Mn-Ce / γ-Al2O3 catalysts on catalytic combustion performance of soot,a series of x Mny Ce / γ-Al2O3（ x = 4,6,8,10,y = 10） catalysts with different ratio of Mn and Ce were prepared by an acid-aided sol-gel method. The effect of metallic Mn and Ce on their microstructure and catalytic properties was investigated by X-ray diffraction（ XRD）,scanning electron microscope（ SEM）,energy dispersive spectroscopy（ EDS） and transmission electron microscope（ TEM） analysis. According to the analysis results,it is indicated that the diameter variation range of MnO2 and CeO2 is from 5 nm to 20 nm. Mn appears as MnO2 in the catalyst. Some Mn2O3 disperses on the catalyst surface,when the value of x is 6 or higher. The grain size and dispersion of CeO2 are the best,when the value of x is 8. Effect of the catalysts on combustion performance of soot is analyzed by TG（ thermal gravimetric analyzer）. Test results show that： with the increase of x,the temperature of the catalyst T10 decreases firstly and then increases; T10 temperature of 8Mn10 Ce / γ-Al2O3 catalyst is the lowest among the catalysts,that is 320. 9 ℃,which can significantly reduce the ignition temperature of soot and have the best catalytic combustion performance of soot.

关 键 词：车辆工程 柴油机 Mn CE 碳烟 催化剂 

分 类 号：U473[机械工程—车辆工程] TK421.5[交通运输工程—载运工具运用工程]