Performance of Zn-Al co-doped La<sub>2</sub>O<sub>3</sub> catalysts in  the oxidative coupling of methane

LI Ying-tao; NIU Peng-yu; WANG Qiang; JIA Li-tao; LIN Ming-gui; LI De-bao

doi:10.1016/S1872-5813(21)60100-7

Volume 49 Issue 10

Oct. 2021

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Article Navigation > Journal of Fuel Chemistry and Technology > 2021 > 49(10): 1458-1467

LI Ying-tao, NIU Peng-yu, WANG Qiang, JIA Li-tao, LIN Ming-gui, LI De-bao. Performance of Zn-Al co-doped La2O3 catalysts in the oxidative coupling of methane[J]. Journal of Fuel Chemistry and Technology, 2021, 49(10): 1458-1467. doi: 10.1016/S1872-5813(21)60100-7

Citation:

LI Ying-tao, NIU Peng-yu, WANG Qiang, JIA Li-tao, LIN Ming-gui, LI De-bao. Performance of Zn-Al co-doped La₂O₃ catalysts in the oxidative coupling of methane[J]. Journal of Fuel Chemistry and Technology, 2021, 49(10): 1458-1467. doi: 10.1016/S1872-5813(21)60100-7

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Performance of Zn-Al co-doped La₂O₃ catalysts in the oxidative coupling of methane

doi: 10.1016/S1872-5813(21)60100-7

LI Ying-tao^{1, 2
,},
NIU Peng-yu^{1
,
,},
WANG Qiang¹,
JIA Li-tao¹,
LIN Ming-gui^{1
,
,},
LI De-bao^{1, 3}

1.
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
Dalian National Laboratory for Clean Energy, Dalian 116023, China

Funds: The project was supported by Shanxi Science and Technology Department Bidding Project (20191101012) and the Autonomous Research Project of SKLCC (2020BWZ003)

Received Date: 2021-04-12
Rev Recd Date: 2021-04-21

Available Online: 2021-05-28

Publish Date: 2021-10-30

Abstract

Abstract

Zn-doped and Zn-Al co-doped La₂O₃ catalysts were prepared by citric acid sol-gel method and characterized by a series of in situ technologies, to investigate the structure-activity relationship of La₂O₃-based catalysts in the oxidative coupling of methane (OCM). The in situ XRD results reveal a thermal expansion of the La₂O₃ crystal along the c-axis at high temperature. The H₂-TPR results show two types of oxygen species on the La₂O₃-based catalysts, viz., the strong-binding oxygen species and weak-binding oxygen species; in addition, the XPS results indicate that the strong-binding oxygen species is probably attributed to anion radical O⁻. The doping with Zn can significantly increase the number of oxygen vacancies in the Zn-doped La₂O₃ catalysts, which can promote the activation of oxygen and generate more strong-binding oxygen species; as a result, the Zn-doped La₂O₃ catalyst shows better performance in OCM in comparison with the unmodified La₂O₃ catalyst. Moreover, the co-doping with Al can promote the dispersion of Zn in La₂O₃ and further raise the number of strong-binding oxygen species in the Zn-Al co-doped La₂O₃ catalysts, which is beneficial to enhance the selectivity to C₂₊ hydrocarbons in the OCM reaction
- Zn-Al co-doping,
- La₂O₃,
- oxygen vacancies,
- crystal structure,
- oxidative coupling of methane (OCM)

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References(30)

References

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