Photocatalytic oxidation of CH4 to oxygenates on Fe(III)Ox/ZnO

HAO Ying-dong; LIU Shuang; SUN Nan-nan; WEI Wei

doi:10.1016/S1872-5813(22)60016-1

Volume 50 Issue 9

Oct. 2022

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Article Navigation > Journal of Fuel Chemistry and Technology > 2022 > 50(9): 1160-1166

HAO Ying-dong, LIU Shuang, SUN Nan-nan, WEI Wei. Photocatalytic oxidation of CH4 to oxygenates on Fe(III)Ox/ZnO[J]. Journal of Fuel Chemistry and Technology, 2022, 50(9): 1160-1166. doi: 10.1016/S1872-5813(22)60016-1

Citation:

HAO Ying-dong, LIU Shuang, SUN Nan-nan, WEI Wei. Photocatalytic oxidation of CH₄ to oxygenates on Fe(III)O_x/ZnO[J]. Journal of Fuel Chemistry and Technology, 2022, 50(9): 1160-1166. doi: 10.1016/S1872-5813(22)60016-1

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Photocatalytic oxidation of CH₄ to oxygenates on Fe(III)O_x/ZnO

doi: 10.1016/S1872-5813(22)60016-1

HAO Ying-dong^{1, 2
,},
LIU Shuang^{1, 2},
SUN Nan-nan^{1
,
,},
WEI Wei^{1, 3
,
,}

1.
CAS Key Laboratory of Low-carbon Conversion Science and Engineering, Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
School of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China

Funds: The project was supported by Shanghai Science and Technology Committee (19YF1452800, 19ZR1463500)

Received Date: 2022-02-09
Accepted Date: 2022-04-12
Rev Recd Date: 2022-03-15

Available Online: 2022-04-28

Publish Date: 2022-10-21

Abstract

Abstract

A series of nFe(III)O_x/ZnO photocatalysts with different Fe contents was prepared by impregnation method, and the samples were characterized by XRD, N₂ physisorption, TEM, XPS, UV-vis and PL. It was found that by changing the concentration of Fe species in the impregnation solution, the Fe content in the final sample could be properly adjusted. Within the scope of this work, the loading of Fe does not cause significant changes in the phase, morphology, and porous structure of the ZnO support. However, the electronic state of the catalyst surface was altered considerably, with more O-vacancies were introduced. Fe species enhanced the separation of photo-induced electron-hole pairs, which was responsible to improve the performance of photocatalytic CH₄ conversion. Through the optimization of solvent volume, H₂O₂ concentration and reaction time, the 0.1Fe(III)O_x/ZnO sample showed the best performance over which the yield and selectivity of liquid oxidation products (CH₃OH, CH₃OOH, HCHO) was 5443 μmol/(g_cat·h) and 99%, respectively. Based on radical quenching experiments, it was found that the ·${{\rm{O}}_2^-} $ radicals derived from H₂O₂ played a major role for the activation of CH₄ to ·CH₃.
- methane,
- photocatalysis,
- ZnO,
- oxidation,
- activation

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References(23)

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