Effect of oxygen vacancies in Ni/Sm2O3-CeO2/Al2O3 catalyst on CO2 methanation at low temperature

被引：0

作者：

Guo X. ^{[1
,2
]}

Mao Y. ^{[1
,2
]}

Liu X. ^{[1
,2
]}

Qiu L. ^{[1
,2
]}

Yu F. ^{[1
,2
]}

Yan X. ^{[1
,2
]}

机构：

[1] College of Chemical Engineering and Technology, Taiyuan University of Technology, Shanxi, Taiyuan

[2] State Key Laboratory of Clean and Efficient Coal Utilization, Taiyuan University of Technology, Shanxi, Taiyuan

来源：

Huagong Jinzhan/Chemical Industry and Engineering Progress | 2024年 / 43卷 / 04期

关键词：

carbon dioxide; catalysis; catalyst; hydrogenation; methane;

D O I：

10.16085/j.issn.1000-6613.2023-0571

中图分类号：

学科分类号：

摘要：

Ni/Sm2O3-CeO2/Al2O3 and Ni/MnOx-Sm2O3-CeO2/Al2O3 catalysts were obtained by using Mn, Sm and Ce sources in the form of LDHs precursor by hydrothermal synthesis after a standard calcination and reduction treatment. Subsequently, the catalytic performance of the two catalysts were investigated at low temperature in CO2 methanation. Compared to Ni/Sm2O3-CeO2/Al2O3, Ni/MnOx-Sm2O3-CeO2/Al2O3 with the introduction of MnOx showed an excellent performance below 225℃, with 68% of CO2 conversion and 100% of CH4 selectivity, and 0.087s−1 of TOF, which was higher than that of Ni/Sm2O3-CeO2/Al2O3 (0.013s−1). Meanwhile, Ni/MnOx-Sm2O3-CeO2/Al2O3 maintained stable CO2 conversion and CH4 selectivity in long-term test for 100h. This was mainly due to the fact that the introduction of MnOx increased the oxygen vacancies on Ni/MnOx-Sm2O3-CeO2/Al2O3 with a high degree of Ni particle dispersion. Meanwhile, MnOx could also increase the basic sites of the resultant catalyst, which promoted CO2adsorption and activation. In situ DRIFTS analysis further revealed that oxygen vacancies on Ni/MnOx-Sm2O3-CeO2/Al2O3 promoted the formation of formate and methoxy intermediates at low temperatures, leading to an enhanced catalytic properties in CO2 methanation. © 2024 Chemical Industry Press Co., Ltd.. All rights reserved.

引用

页码：1840 / 1850

页数：10

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