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<p>To improve the efficiency and product quality of biomass pyrolysis, elm wood samples were subjected to Mg(OH)₂-assisted torrefaction at 220, 250, and 280&#xa0;°C with different mass ratios of Mg(OH)₂, and their subsequent pyrolysis characteristics were systematically investigated. The results showed that, compared with conventional torrefaction, Mg(OH)₂-assisted torrefaction significantly increased CO₂ yield (55.48% at 220&#xa0;°C compared with approximately 43% for the raw biomass sample), while suppressing the formation of CO, CH₄, and H₂. In terms of liquid products, Mg(OH)₂-assisted torrefaction promoted the formation of aromatic hydrocarbons and reduced the acid fraction to as low as 0.97%, whereas phenolic compounds remained dominant in the conventional samples under the same conditions. Thermogravimetric analysis revealed that the main pyrolysis peak of Mg(OH)₂-assisted samples became narrower (38%–52%) and higher (15%–28%), with an overall decrease in activation energy and a higher residual char yield above 600&#xa0;°C. These results indicate that Mg(OH)₂ facilitated the decomposition of cellulose and lignin while enhancing char structural stability.</p>

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Experimental Study on Pyrolysis Characteristics of Elm Wood Strengthened by Mg(OH)₂-Assisted Torrefaction

  • 期刊论文

  • 发表日期：

    2026年4月24日

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  • Yanyang Mei,
  • Baojun Wang,
  • Jiapeng Gong,
  • Shuo Yang,
  • Weiwei Zhang

摘要

To improve the efficiency and product quality of biomass pyrolysis, elm wood samples were subjected to Mg(OH)₂-assisted torrefaction at 220, 250, and 280 °C with different mass ratios of Mg(OH)₂, and their subsequent pyrolysis characteristics were systematically investigated. The results showed that, compared with conventional torrefaction, Mg(OH)₂-assisted torrefaction significantly increased CO₂ yield (55.48% at 220 °C compared with approximately 43% for the raw biomass sample), while suppressing the formation of CO, CH₄, and H₂. In terms of liquid products, Mg(OH)₂-assisted torrefaction promoted the formation of aromatic hydrocarbons and reduced the acid fraction to as low as 0.97%, whereas phenolic compounds remained dominant in the conventional samples under the same conditions. Thermogravimetric analysis revealed that the main pyrolysis peak of Mg(OH)₂-assisted samples became narrower (38%–52%) and higher (15%–28%), with an overall decrease in activation energy and a higher residual char yield above 600 °C. These results indicate that Mg(OH)₂ facilitated the decomposition of cellulose and lignin while enhancing char structural stability.