Enhancement of La2O3 to Li-Mn/WO3/TiO2 for oxidative coupling of methane

被引：29
作者：
Cheng, Fei [1 ,2 ]
Yang, Jian [1 ]
Yan, Liang [1 ]
Zhao, Jun [1 ]
Zhao, Huahua [1 ]
Song, Huanling [1 ]
Chou, Ling Jun [1 ,3 ]
机构：
[1] Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Oxo Synth & Select Oxidat, Lanzhou 730000, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
[3] Chinese Acad Sci, Suzhou Res Inst LICP, Suzhou 215123, Peoples R China
来源：
JOURNAL OF RARE EARTHS | 2020年 / 38卷 / 02期
关键词：
OCM; La2O3; Oxygen species; CH4-TPSR; Rare earths; OXIDE CATALYSTS; MN2O3-NA2WO4/SIO2; CATALYST; SURFACE; PERFORMANCE; ETHYLENE; OXYGEN; ACTIVATION; CONVERSION; SUPPORT; OCM;
D O I：
10.1016/j.jre.2019.03.023
中图分类号：
O69 [应用化学];
学科分类号：
081704 ;
摘要：
A series of La2O3-promoted Li-Mn/WO3/TiO2 catalysts were prepared by varying the concentration of La2O3 promoter. The effect of La2O3 promoter on its properties and catalytic performance for OCM was characterized with XRD, FT-IR, O-2-TPD, Raman, CO2-TPD, H-2-TPR, XPS and CH4-TPSR. The results show that all the La2O3-promoted Li-Mn/WO3/TiO2 catalysts possess a larger amount of strong basic sites and more abundant chemisorbed oxygen species in comparison with Li-Mn/WO3/TiO2, which is beneficial to OCM reaction. Furthermore, La2O3 promoter can enhance the mobility of the oxygen species and the Mn species redox ability, which can also be favorable for the improvement of the catalytic performance for OCM. Due to the optimal synergistic interaction of these factors, 5 wt%La2O3-Li-Mn/WO3/TiO2 exhibits the best performance among all the catalysts, on which the highest C-2 yield of 19.2% is achieved at 750 degrees C. (C) 2020 Chinese Society of Rare Earths. Published by Elsevier B.V. All rights reserved.
引用
收藏
页码：167 / 174
页数：8
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