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Catalytic hydropyrolysis of lignin using NiMo-doped catalysts: Catalyst evaluation and mechanism analysis

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  • Li, Tan
  • Su, Jing
  • Wang, Huiyuan
  • Wang, Cong
  • Xie, Wen
  • Wang, Kaige

Abstract

NiMo-doped catalysts were investigated for the conversion of lignin to drop-in fuel through catalytic hydropyrolysis. The influence of NiMo-doped catalysts with different carriers and Ni/Mo molar ratios on the hydropyrolysis product distribution were studied using both lignin and lignin model compounds. Two coefficients were proposed to qualitatively evaluate the catalytic performance of NiMo-doped catalysts. Low yield of methane (13.04c%) and high yield of condensable hydrocarbons products (25.82c%) with low selectivity of polyaromatics (4.37%) were obtained at 1.0 MPa H2 and 400 °C catalytic temperature during lignin catalytic hydropyrolysis over Ni1Mo/ZrO2. The hydrodeoxygenation activity of NixMo/ZrO2 depends on Ni0, Mo4+, and Mo3+. The synergistic effect of Ni and Mo promotes the removal of the phenolic methoxy group. The increase in hydrogen pressure tends to make hydrogen to be consumed through hydrocracking and hydrogenation reactions. The influence of Ni1Mo/ZrO2 on evolution of lignin hydropyrolysis volatiles was revealed. Ni shows strong activity in the removal of phenolic hydroxyl groups and benzene ring hydrogenation, while Mo tends to remove phenolic methoxy groups.

Suggested Citation

  • Li, Tan & Su, Jing & Wang, Huiyuan & Wang, Cong & Xie, Wen & Wang, Kaige, 2022. "Catalytic hydropyrolysis of lignin using NiMo-doped catalysts: Catalyst evaluation and mechanism analysis," Applied Energy, Elsevier, vol. 316(C).
    • Handle: RePEc:eee:appene:v:316:y:2022:i:c:s0306261922004962
    DOI: 10.1016/j.apenergy.2022.119115
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    1. Zhong, Dian & Zeng, Kuo & Li, Jun & Qiu, Yi & Flamant, Gilles & Nzihou, Ange & Vladimirovich, Vasilevich Sergey & Yang, Haiping & Chen, Hanping, 2022. "Characteristics and evolution of heavy components in bio-oil from the pyrolysis of cellulose, hemicellulose and lignin," Renewable and Sustainable Energy Reviews, Elsevier, vol. 157(C).
    2. He, Yifeng & Zhao, Yingnan & Chai, Meiyun & Zhou, Zhongyue & Sarker, Manobendro & Li, Chong & Liu, Ronghou & Cai, Junmeng & Liu, Xinghua, 2020. "Comparative study of fast pyrolysis, hydropyrolysis and catalytic hydropyrolysis of poplar sawdust and rice husk in a modified Py-GC/MS microreactor system: Insights into product distribution, quantum," Renewable and Sustainable Energy Reviews, Elsevier, vol. 119(C).
    3. Yichen Liu & James J. Leahy & Jacek Grams & Witold Kwapinski, 2019. "Hydro-Pyrolysis and Catalytic Upgrading of Biomass and Its Hydroxy Residue Fast Pyrolysis Vapors," Energies, MDPI, vol. 12(18), pages 1-18, September.
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    1. Chen, Mingqiang & Li, Hong & Wang, Yishuang & Tang, Zhiyuan & Dai, Wei & Li, Chang & Yang, Zhonglian & Wang, Jun, 2023. "Lignin depolymerization for aromatic compounds over Ni-Ce/biochar catalyst under aqueous-phase glycerol," Applied Energy, Elsevier, vol. 332(C).

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