文献类型：期刊文献

英文题名：A highly-efficient La-MnOx catalyst for propane combustion: the promotional role of La and the effect of the preparation method

作者：Xie, Yujie;Guo, Yun;Guo, Yanglong;Wang, Li;Zhan, Wangcheng;Wang, Yunsong;Gong, Xue-qing;Lu, Guanzhong[1]

机构：[1]East China Univ Sci & Technol, Sch Chem & Mol Engn, Key Lab Adv Mat, Shanghai 200237, Peoples R China; East China Univ Sci & Technol, Sch Chem & Mol Engn, Res Inst Ind Catalysis, Shanghai 200237, Peoples R China

年份：2016

卷号：6

期号：23

起止页码：8222

外文期刊名：Catalysis Science & Technology

收录：;EI(收录号：20164903077503);WOS:【SCI-EXPANDED(收录号:WOS:000389224400004)】；

基金：This work was supported financially by the National Key Research and Development Program of China (2016YFC0204300), the National High Technology Research and Development Program of China (2015AA034603 and 2012AA111717), the Commission of Science and Technology of Shanghai Municipality (15DZ1205305) and Fundamental Research Funds for the Central Universities (WJ1514020).

语种：英文

外文关键词：Catalysts - Surface defects - Catalytic oxidation - Manganese - Catalysis - Precipitation (chemical) - Oxygen - Lanthanum

摘要：A La-modified MnOx catalyst was developed for the total oxidation of C3H8. The promotional role of La and the effect of the preparation method on the structural, physicochemical and catalytic properties of the La-MnOx catalyst were investigated. The results show that the presence of La in MnOx can remarkably improve the oxygen reactivity of MnOx and promotes the reduction properties of Mn species with the aid of a strong interaction between Mn and La. The preparation method obviously affected the crystal structure, lattice defects, surface phase composition, reduction properties and apparent morphology of the La-0.4-MnOx catalyst. When the La-0.4-MnOx (C-0.4) catalyst was prepared by using the co-precipitation method, it exhibited excellent catalytic performance, good thermal stability and enhanced H2O resistance to the title reation, because the C-0.4 sample possesses a higher atomic ratio of Mn4+/Mn3+ (2.03) and contains more absorbed oxygen species and high activity and mobility of lattice oxygen. In addition, the catalytic reaction mechanism of C3H8 oxidation was not changed by La doping but promoted the C3H8 adsorption on the catalyst surface, resulting in the acceleration of its rate-determining step to a large extent.