Lanthanum-doped Cu-Mn composite oxide catalysts for catalytic oxidation of toluene

作     者：Jing Pan Wentao Du Yongjun Liu Yan Cheng Shandong Yuan 

作者机构：College of Architecture and EnvironmentSichuan University National Engineering Research Center for Flue Gas Desulfurization Faculty of Geosciences and Environmental EngineeringSouthwest Jiaotong University 

出 版 物：《Journal of Rare Earths》 (稀土学报（英文版）)

年 卷 期：2019年第37卷第6期

页      面：602-608页

核心收录：

学科分类：081704[工学-应用化学] 07[理学] 08[工学] 0817[工学-化学工程与技术] 070303[理学-有机化学] 0703[理学-化学] 

基　　金：Project supported by Sichuan Provincial Science and Technology Agency(2018GZ0414) the Chengdu Science and Technology Bureau Huimin Projects(2016-HM01-00075-SF) 

主　　题：Manganese Copper Lanthanum Catalytic combustion Toluene Rare earths 

摘      要：CuMn mixed oxides catalysts doped with La were prepared following a co-precipitation method and used for the catalytic oxidation of toluene. Catalysts properties of the catalysts were investigated by X-ray diffraction, N_2 adsorption/desorption,scanning electron microscopy, H_2-temperature-programmed reduction(H_2-TPR), O_2-temperature-programmed desorption(O_2-TPD) and X-ray photoelectron spectroscopy techniques. Characterization data reveal that the phase change and decrease in crystallinity of the La-doped catalysts increase the number of oxygen vacancies. Improvements in reducibility and an increase in the amount of chemisorbed oxygen of the La-doped catalysts were also verified by H_2-TPR and O_2-TPD. The activity of the CuMn mixed oxides catalysts is significantly improved by the addition of a nominal amount of La. The CuMn/La-4 mol% catalyst exhibits the best catalytic activity, with a 90%conversion temperature of 255 ℃,attributed to a high Mn^(3+)ratio, superficial chemisorbed oxygen,and high surface area. This study indicates La to be a promising dopant for Cu-Mn catalysts toward toluene oxidation.