Lanthanum-doped Cu-Mn composite oxide catalysts for catalytic oxidation of toluene
来源期刊：Journal of Rare Earths2019年第6期
论文作者：Jing Pan Wentao Du Yongjun Liu Yan Cheng Shandong Yuan
文章页码：602 - 608
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, N2 adsorption/desorption,scanning electron microscopy, H2-temperature-programmed reduction（H2-TPR）, O2-temperature-programmed desorption（O2-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 H2-TPR and O2-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 Mn3+ratio, superficial chemisorbed oxygen,and high surface area. This study indicates La to be a promising dopant for Cu-Mn catalysts toward toluene oxidation.
Jing Pan1，Wentao Du1，Yongjun Liu1,2，Yan Cheng3，Shandong Yuan2
1. College of Architecture and Environment,Sichuan University2. National Engineering Research Center for Flue Gas Desulfurization3. Faculty of Geosciences and Environmental Engineering,Southwest Jiaotong University
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, N2 adsorption/desorption,scanning electron microscopy, H2-temperature-programmed reduction（H2-TPR）, O2-temperature-programmed desorption（O2-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 H2-TPR and O2-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 Mn3+ratio, superficial chemisorbed oxygen,and high surface area. This study indicates La to be a promising dopant for Cu-Mn catalysts toward toluene oxidation.
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