Hu Hualing, Tan Wenbing, Xi Beidou
State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.
State Environmental Protection Key Laboratory of Simulation and Control of Groundwater Pollution, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China.
Environ Sci Ecotechnol. 2021 Oct 21;8:100131. doi: 10.1016/j.ese.2021.100131. eCollection 2021 Oct.
The effect of the interaction between lignin-phenol monomers and holocellulose in natural biomass on the distribution of pyrolysis products remains unknown. The results of this study showed that the interaction between lignin and holocellulose during the pyrolysis of natural biomass became more pronounced as the pyrolysis temperature increased. The interaction between lignin and holocellulose in the natural crosslinked structure promoted the generation of CO and inhibited the generation of CO at 750 °C. Lignin inhibited the decarboxylic reaction of hemicellulose during pyrolysis but was important for the generation of levoglucosan during cellulose pyrolysis. Holocellulose slowed the demethoxyreaction of lignin guaiacol but promoted the removal of aliphatic hydrocarbon substituents from the aromatic ring. The cinnamyl phenol monomers of lignin increased the rates of change of biomass pyrolysis products with the lignin mass fraction at 400 °C. However, when the pyrolysis temperature increased to 750 °C, all types of lignin phenol monomers increased the rates of change of the biomass pyrolysis products. Our results provide new insights that have implications for the development of pyrolysis techniques for the resource recycling of various types of biomass for the preparation of high-grade gaseous and liquid fuels.
天然生物质中木质素 - 酚类单体与全纤维素之间的相互作用对热解产物分布的影响尚不清楚。本研究结果表明，随着热解温度升高，天然生物质热解过程中木质素与全纤维素之间的相互作用愈发显著。在750℃时，天然交联结构中木质素与全纤维素之间的相互作用促进了CO的生成并抑制了CO₂的生成。木质素在热解过程中抑制了半纤维素的脱羧反应，但对纤维素热解过程中左旋葡聚糖的生成具有重要作用。全纤维素减缓了木质素愈创木酚的脱甲氧基反应，但促进了芳香环上脂肪烃取代基的去除。木质素的肉桂基酚类单体在400℃时提高了生物质热解产物随木质素质量分数的变化率。然而，当热解温度升至750℃时，所有类型的木质素酚类单体均提高了生物质热解产物的变化率。我们的研究结果提供了新的见解，对开发用于各类生物质资源回收以制备高品位气态和液态燃料的热解技术具有重要意义。
