铈基和镧基复合氧化物催化剂催化碳烟燃烧性能研究  

Study on the Catalytic Soot Combustion Properties of Cerium-and Lanthanum-Based Composite Oxide Catalysts

作　　者：孙丹 吴钢[1] 李宗霖 黎思杰 冯国达 SUN Dan;WU Gang;LI Zonglin;LI Sijie;FENG Guoda(School of Automotive and Mechanical Engineering,Changsha University of Science and Technology,Changsha 410000 China;School of Automobile and Transportation,Jiangsu University,Zhenjiang 212000 China)

机构地区：[1]长沙理工大学汽车与机械工程学院,湖南长沙410000 [2]江苏大学汽车与交通学院,江苏镇江212000

出　　处：《西华大学学报（自然科学版）》2022年第5期18-27,共10页Journal of Xihua University:Natural Science Edition

基　　金：国家自然科学基金(51976016);湖南省自然科学基金(2020JJ4616)。

摘　　要：文章采用浸渍法、水热合成法和共沉淀法制备了3种不同类型的碳烟催化剂:CeFeCo、La-Mn-O和BiCeO。通过对3种样品扫描电镜(SEM)、X射线衍射(XRD)、X射线电子能谱(XPS)和氢气程序升温还原(TPR)等表征结果进行比较分析,发现:La-Mn-O样品中吸附氧的占比量最大;CeFeCo样品中的金属离子含量最多,且Ce^(3+)含量大于BiCeO样品。在氢气程序升温还原中,可以观察到CeFeCo具有最低温的还原峰,在283℃左右。最后通过程序升温氧化反应系统对3个样品进行活性评估,在紧密接触情况下CeFeCo、La-Mn-O和BiCeO样品催化50%碳烟氧化所需的温度,即T_(50)分别为329、355和374℃,与碳烟燃烧的空白组相比,T_(50)分别降低了265、239和220℃。这表明3种催化剂均成功制备并且具有良好的催化碳烟燃烧性能,特别是CeFeCo催化剂表现出的低温催化燃烧性能最好。Three different types of carbon soot catalysts,CeFeCo,La-Mn-O and BiCeO,were prepared by impregnation,hydrothermal synthesis and co-precipitation methods.By comparing and analyzing the characterization results of the three samples,such as scanning electron microscopy(SEM),X-ray diffraction(XRD),X-ray photoelectron spectroscopy(XPS) and H_(2)-temperature programmed reduction(TPR),it can be found that La-Mn-O sample has the largest proportion of chemisorbed oxygen,CeFeCo sample has the largest metal ion content,and Ce^(3+) content is higher than BiCeO sample.It can be found that CeFeCo has the lowest reduction peak at about 283 ℃ in the H2-TPR.Finally,the activities of the three samples were evaluated by a temperature-programmed oxidation reaction system.The temperatures required to catalyze the oxidation of 50% soot for CeFeCo,La-Mn-O and BiCeO samples in tight contact were 329,355 and 374 ℃,respectively,which were reduced by 265,239 and 220 ℃,compared with the blank group.This indicates that all three catalysts were successfully prepared and had good catalytic soot combustion performance,and especially the CeFeCo catalyst exhibited the best low-temperature catalytic combustion performance.

关 键 词：碳烟 复合氧化物催化剂 催化燃烧 表征分析 

分 类 号：TK421.5[动力工程及工程热物理—动力机械及工程]