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<p>Currently, the comprehensive utilization of biomass has attracted significant attention, and fast pyrolysis is increasingly regarded as one of the most promising technologies for biomass conversion. In this study, a fixed-bed reactor was employed to investigate the effects of rice husk pyrolysis under various atmospheres (H<sub>2</sub>, CH<sub>4</sub>, H<sub>2</sub>-CH<sub>4</sub>) and catalysts conditions. The results indicate that the bio-oil yield reached 37.30 wt% at 500 ℃ for 30&#xa0;min under an H<sub>2</sub>-CH<sub>4</sub> (11:5) mixed atmosphere. Among the metal-modified HZSM-5 catalysts with different zinc loadings, the variant containing 5% Zn demonstrated superior catalytic performance. This improvement was attributed to the uniform crystalline morphology and hierarchical porous structure of HZSM-5, which facilitate biomass pyrolysis. Furthermore, <sup>13</sup>CH<sub>4</sub> isotope tracer experiments combined with nuclear magnetic resonance (NMR) analysis of bio-oil confirmed that the small-molecule gases produced reactive •CHₓ and •H radicals via catalytic activation. These radicals participated in the biomass pyrolysis reaction and promoted the formation of phenolic compounds.</p>

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Upgrading of Biomass Pyrolysis Oil Quality Via the Coupled Process of Small Molecule Catalytic Activation and Biomass Pyrolysis

  • 期刊论文

  • 发表日期：

    2026年5月9日

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  • Lixia He,
  • Ruiyuan Tang,
  • Zhibing Shen,
  • Tingting Yang,
  • Juntao Zhang

摘要

Currently, the comprehensive utilization of biomass has attracted significant attention, and fast pyrolysis is increasingly regarded as one of the most promising technologies for biomass conversion. In this study, a fixed-bed reactor was employed to investigate the effects of rice husk pyrolysis under various atmospheres (H2, CH4, H2-CH4) and catalysts conditions. The results indicate that the bio-oil yield reached 37.30 wt% at 500 ℃ for 30 min under an H2-CH4 (11:5) mixed atmosphere. Among the metal-modified HZSM-5 catalysts with different zinc loadings, the variant containing 5% Zn demonstrated superior catalytic performance. This improvement was attributed to the uniform crystalline morphology and hierarchical porous structure of HZSM-5, which facilitate biomass pyrolysis. Furthermore, 13CH4 isotope tracer experiments combined with nuclear magnetic resonance (NMR) analysis of bio-oil confirmed that the small-molecule gases produced reactive •CHₓ and •H radicals via catalytic activation. These radicals participated in the biomass pyrolysis reaction and promoted the formation of phenolic compounds.