Based on the concentrated photo-thermal thermogravimetry analyzer (PT-TGA) reactor, the pyrolysis of the cellulose, hemicellulose and lignin with different ratios at 100 °C/min and 550–850 °C was performed. The interaction among the three components significantly reduced the reaction temperatures and increased the maximum weight loss rate. The cellulose/lignin interactions were the main reason for the increase of gas production, especially for the H production which reached 128.13 mL/g biomass, much higher than the calculated value of 75.35 mL/g biomass without considering the interactions. What occurred during the co-pyrolysis of cellulose/lignin was the combination of free radicals without consuming the hydrogen radicals, while the formation of chemicals in others’ interactions integrated with the hydrogen radicals inhibited the production of H at high temperatures. For full-component pyrolysis, the yield of C-containing gas can be calculated by adding a coefficient of interaction between two components, indicating that the effect of the three-component interaction was much lower than that of the two-component. This study established the interaction mechanism for the three components of biomass during photo-thermal pyrolysis based on free radicals.

中文翻译：

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纤维素、半纤维素和木质素光热解过程中的颗粒内反应机理：自由基的演化特征

基于浓缩光热热重分析仪（PT-TGA）反应器，以100 ℃/min、550~850 ℃的速度对不同比例的纤维素、半纤维素和木质素进行热解。三种组分之间的相互作用显着降低了反应温度并提高了最大失重率。纤维素/木质素相互作用是产气量增加的主要原因，特别是产氢量达到128.13 mL/g生物质，远高于不考虑相互作用的计算值75.35 mL/g生物质。纤维素/木质素共热解过程中发生的是自由基的结合，但不消耗氢自由基，而与氢自由基结合的其他相互作用中形成的化学物质抑制了高温下H的产生。对于全组分热解，含C气体的产率可以通过添加两个组分之间的相互作用系数来计算，表明三组分相互作用的影响远低于二组分的影响。该研究建立了基于自由基的光热解过程中生物质三种组分的相互作用机制。