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Insights into the role of Mo in boosting CHx* oxidation for CO2 methane reforming

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  • Lu, Jiali
  • Shi, Yongyong
  • He, Xiong
  • Zhou, Qiao
  • Li, Ziwei
  • Liu, Fei
  • Li, Min

Abstract

CHx* oxidation is one of the most vital routes to alleviate the carbon deposition problem of CO2 reforming of methane (DRM) reaction. Whereas, little experimental evidence has been observed on NiMo catalysts where the CHx* oxidation was dominant over its dissociation reaction. Herein, to experimentally unveil the CHx* oxidation route of NiMo catalysts, we design three catalysts with different particle sizes and structures. Among them, Mo/Niphy@SiO2 core shell catalyst demonstrated the dominant CHx* oxidation route over its dissociation based on in-situ diffuse reflectance infrared Fourier transform spectroscopy experiments. This was attributed to the confinement effect of SiO2 and the formation of Ni–Mo alloy, inhibiting the CHx* dissociation reaction. It exhibited relatively stable CH4 and CO2 conversions (77 % and 75 % respectively) within 180 h. By contrast, on Mo/Niphy catalyst which has a big Ni size, CHx* was mainly dissociated to C* and oxidized to CO which further underwent a disproportion reaction to produce CO2 and C*, leading to the severe carbon deposition and unstable DRM performance. The strategy to unveil the dominant role of CHx* oxidation via design catalysts with different sizes and structures sheds light on the study of reaction mechanism of other reactions.

Suggested Citation

  • Lu, Jiali & Shi, Yongyong & He, Xiong & Zhou, Qiao & Li, Ziwei & Liu, Fei & Li, Min, 2024. "Insights into the role of Mo in boosting CHx* oxidation for CO2 methane reforming," Renewable Energy, Elsevier, vol. 231(C).
    • Handle: RePEc:eee:renene:v:231:y:2024:i:c:s0960148124009832
    DOI: 10.1016/j.renene.2024.120915
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    References listed on IDEAS

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    1. Meloni, Eugenio & Saraceno, Emilia & Martino, Marco & Corrado, Antonio & Iervolino, Giuseppina & Palma, Vincenzo, 2023. "SiC-based structured catalysts for a high-efficiency electrified dry reforming of methane," Renewable Energy, Elsevier, vol. 211(C), pages 336-346.
    2. Wang, Bingzheng & Lu, Xiaofei & Zhang, Cancan & Wang, Hongsheng, 2022. "Cascade and hybrid processes for co-generating solar-based fuels and electricity via combining spectral splitting technology and membrane reactor," Renewable Energy, Elsevier, vol. 196(C), pages 782-799.
    3. Bian, Zhoufeng & Deng, Shaobi & Sun, Zhenkun & Ge, Tianshu & Jiang, Bo & Zhong, Wenqi, 2022. "Multi-core@Shell catalyst derived from LDH@SiO2 for low- temperature dry reforming of methane," Renewable Energy, Elsevier, vol. 200(C), pages 1362-1370.
    4. Li, Ziwei & Lin, Qian & Li, Min & Cao, Jianxin & Liu, Fei & Pan, Hongyan & Wang, Zhigang & Kawi, Sibudjing, 2020. "Recent advances in process and catalyst for CO2 reforming of methane," Renewable and Sustainable Energy Reviews, Elsevier, vol. 134(C).
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