Performance of oxidative coupling of methane on LiMn2O4/TiO2 catalysts

LIU Yu-lan; ZHANG Ze-kai; NI Guang; LIU Hua-yan; CHEN Yin-fei

Volume 44 Issue 6

Jun. 2016

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LIU Yu-lan, ZHANG Ze-kai, NI Guang, LIU Hua-yan, CHEN Yin-fei. Performance of oxidative coupling of methane on LiMn2O4/TiO2 catalysts[J]. Journal of Fuel Chemistry and Technology, 2016, 44(6): 703-709.

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LIU Yu-lan, ZHANG Ze-kai, NI Guang, LIU Hua-yan, CHEN Yin-fei. Performance of oxidative coupling of methane on LiMn₂O₄/TiO₂ catalysts[J]. Journal of Fuel Chemistry and Technology, 2016, 44(6): 703-709.

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Performance of oxidative coupling of methane on LiMn₂O₄/TiO₂ catalysts

Department of Energy Reaction Engineerig, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, China

Received Date: 2015-12-21
Rev Recd Date: 2016-03-23

Available Online: 2021-01-23

Publish Date: 2016-06-10

Abstract

Abstract

A series of LiMn₂O₄/TiO₂ catalysts with spinel crystal structure were prepared by solid state reaction method, and the catalytic performance of oxidative coupling of methane on the different catalysts, such as TiO₂, Li/TiO₂, Mn/TiO₂, LiMn₂O₄ as well as LiMn₂O₄/TiO₂, was evaluated. The catalysts were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, CO₂ temperature programmed desorption and H₂ temperature programmed reduction. It is found that LiMn₂O₄ with spinel structure has high catalytic activity in oxidative coupling of methane reaction. 25.8% of CH₄ conversion, 43.2% of C₂ selectivity was obtained under the reaction conditions of 775℃, 0.1MPa, 7200mL·h^-1·g^-1, CH₄:O₂(volume ratio)=2.5. The introduction of TiO₂ support can not only improve CH₄ conversion and C₂ selectivity, but also restrain the deep oxidation of methane to CO₂. The LiMn₂O₄/TiO₂ with 8% loading amount showed the best activity, on which 31.6% of CH₄ conversion, 52.4% of C₂ selectivity were obtained and CO₂ selectivity was decreased to 26.3%. The effect of calcination temperature on the activity of LiMn₂O₄/TiO₂ catalysts was investigated. 850℃ is the optimal calcination temperature.
- oxidative coupling of methane,
- spinel,
- LiMn₂O₄,
- TiO₂,
- synergistic effect

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References(32)

References

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