Abstract In present work, Fe-lignin composites were prepared by chemical coprecipitation of metal salts and kraft lignin; the thermal stability of the Fe-lignin mixture was then investigated at temperatures up to 300 °C using thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC) at a heating rate of 5 °C min−1 under nitrogen atmosphere. The structural characteristics of Fe-lignin thermal treated under different temperatures were identified by Fourier transform infrared (FTIR) spectrometry. The temperature-programmed thermal decomposition (TPD) of Fe-lignin samples was carried out in a fixed-bed reactor; the gaseous products were analyzed qualitatively and quantitatively by an on-line quantitative gas analysis system. The temperature and pressure of the reactor were monitored and recorded during the thermal decomposition process. It was observed, the thermal decomposition of Fe-lignin samples is a strong exothermic process, and a significant amount of heat is released from the reaction, which triggers a thermal runaway situation.

中文翻译：

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共沉淀法制备金属-木质素复合材料的热稳定性

摘要 目前，通过金属盐和硫酸盐木质素的化学共沉淀制备了铁-木质素复合材料；然后使用热重分析 (TGA) 和差示扫描量热法 (DSC) 在氮气氛下以 5 °C min-1 的加热速率在高达 300 °C 的温度下研究 Fe-木质素混合物的热稳定性。通过傅里叶变换红外（FTIR）光谱法确定了不同温度下热处理的铁木质素的结构特征。Fe-木质素样品的程序升温热分解（TPD）在固定床反应器中进行；通过在线定量气体分析系统对气体产物进行定性和定量分析。在热分解过程中监测和记录反应器的温度和压力。据观察，Fe-木质素样品的热分解是一个强烈的放热过程，反应释放了大量的热量，从而引发了热失控的情况。