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Hydrogen production through glycerol steam reforming over beehive-biomimetic graphene-encapsulated nickel catalysts

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  • Chen, Dong
  • Wang, Wenju
  • Liu, Chenlong

Abstract

Graphene-encapsulated nickel catalysts were synthesized and attached to SiO2 skeleton, vividly described as “beehive-biomimetic catalysts”. Rice husk char (RHC) served as the carbonaceous source in the synthesis. Different catalysts with nickel embedded inside graphene were tested in glycerol steam reforming (GSR) at 550, 600 and 650 °C. Catalysts were characterized by X-ray powder diffraction (XRD), Raman spectroscopy (Raman), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), and thermogravimetric analysis (TGA). The effects of pretreating RHC or reaction temperature on yield of H2, selectivity of gaseous products, and molar ratios of H2/CO and CO/CO2 were investigated. The catalyst with acid-treated RHC as the carbon precursor exhibited better catalytic activity and durability in GSR. It delivered a higher H2 yield of 5.09 mol H2/mol glycerol and a higher H2/CO ratio of 6.79 at 600 °C. The multilayered graphene prevented the oxidation, sintering, or acid corrosion of inner nickel without sacrificing its activity. The SiO2 skeleton also enhanced thermal stability of the catalyst.

Suggested Citation

  • Chen, Dong & Wang, Wenju & Liu, Chenlong, 2020. "Hydrogen production through glycerol steam reforming over beehive-biomimetic graphene-encapsulated nickel catalysts," Renewable Energy, Elsevier, vol. 145(C), pages 2647-2657.
    • Handle: RePEc:eee:renene:v:145:y:2020:i:c:p:2647-2657
    DOI: 10.1016/j.renene.2019.08.022
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    Cited by:

    1. Lin, Qunqing & Zhang, Shuping & Wang, Jiaxing & Yin, Haoxin, 2021. "Synthesis of modified char-supported Ni–Fe catalyst with hierarchical structure for catalytic cracking of biomass tar," Renewable Energy, Elsevier, vol. 174(C), pages 188-198.
    2. Muhammad Harussani Moklis & Shou Cheng & Jeffrey S. Cross, 2023. "Current and Future Trends for Crude Glycerol Upgrading to High Value-Added Products," Sustainability, MDPI, vol. 15(4), pages 1-30, February.
    3. Zhang, Shuping & Yin, Haoxin & Wang, Jiaxing & Zhu, Shuguang & Xiong, Yuanquan, 2021. "Catalytic cracking of biomass tar using Ni nanoparticles embedded carbon nanofiber/porous carbon catalysts," Energy, Elsevier, vol. 216(C).
    4. Ruocco, Concetta & Palma, Vincenzo & Cortese, Marta & Martino, Marco, 2022. "Stability of bimetallic Ni/CeO2–SiO2 catalysts during fuel grade bioethanol reforming in a fluidized bed reactor," Renewable Energy, Elsevier, vol. 182(C), pages 913-922.

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