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Understanding relationship of sepiolite structure tailoring and the catalytic behaviors in glycerol steam reforming over Co/sepiolite derived Co-phyllosilicate catalyst

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  • Wang, Chunsheng
  • Wang, Yishuang
  • Chen, Mingqiang
  • Liang, Defang
  • Cheng, Wen
  • Li, Chang
  • Yang, Zhonglian
  • Wang, Jun

Abstract

Bio-glycerol Steam reforming over green and economical Co/sepiolite (SEP) catalysts was a promising strategy to hydrogen production. The activation pretreatment of SEP played a vital role for boosting catalytic behavior of Co/SEP. This work originally explored a full activation of SEP by molten NaOH for tailoring the physicochemical properties of Co-based catalysts prepared by urea precipitation method. Differing from the acid pickling/calcination and molten NaNO3 activation, the molten NaOH treatment enhanced surface area of SEP by desilicication/dealumination effect and further improved the exposure of framework Si and its surface ‘reactivity’. According to the characterization results of N2 adsorption-desorption, XRD, TEM, H2-TPR, CO/CO2-TPD and XPS, it was found that the feathered Co-phyllosilicate formed on Co/SEP-NaOH catalyst, which enhanced the metal-support interaction, surface area and basic/metallic sites. In contrast, the molten NaNO3 treatment facilitated the transformation of SEP into loughlinite and it was adverse to metal dispersion. Therefore, Co/SEP-NaOH catalyst possessed the highest conversion (92%) and H2 yield (68%) during the activity test at 600 °C and the superior resistance to amorphous coke. Additionally, DFT analysis was introduced to simulate the process of glycerol adsorption and decomposition and demonstrated the Co–CoO interface as the primary reaction sites for the catalytic process.

Suggested Citation

  • Wang, Chunsheng & Wang, Yishuang & Chen, Mingqiang & Liang, Defang & Cheng, Wen & Li, Chang & Yang, Zhonglian & Wang, Jun, 2022. "Understanding relationship of sepiolite structure tailoring and the catalytic behaviors in glycerol steam reforming over Co/sepiolite derived Co-phyllosilicate catalyst," Renewable Energy, Elsevier, vol. 183(C), pages 304-320.
    • Handle: RePEc:eee:renene:v:183:y:2022:i:c:p:304-320
    DOI: 10.1016/j.renene.2021.10.097
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    References listed on IDEAS

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    1. Ochoa, Aitor & Bilbao, Javier & Gayubo, Ana G. & Castaño, Pedro, 2020. "Coke formation and deactivation during catalytic reforming of biomass and waste pyrolysis products: A review," Renewable and Sustainable Energy Reviews, Elsevier, vol. 119(C).
    2. Charisiou, N.D. & Italiano, C. & Pino, L. & Sebastian, V. & Vita, A. & Goula, M.A., 2020. "Hydrogen production via steam reforming of glycerol over Rh/γ-Al2O3 catalysts modified with CeO2, MgO or La2O3," Renewable Energy, Elsevier, vol. 162(C), pages 908-925.
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