基于PT-TGA动力学机理分析的木质纤维素生物质中三种组分的快速测定方法,Fuel

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基于PT-TGA动力学机理分析的木质纤维素生物质中三种组分的快速测定方法
Fuel ( IF 6.7 ) Pub Date : 2024-03-19 , DOI: 10.1016/j.fuel.2024.131521
Gongxiang Song , Dexin Huang , Aishu Li , Ruochen Li , Song Hu , Kai Xu , Qiangqiang Ren , Hengda Han , Yi Wang , Sheng Su , Jun Xiang

纤维素、半纤维素和木质素是木质纤维素生物质的主要成分，快速、准确地测量三种成分的含量有利于生物质的高效利用。然而，目前的化学溶解和滴定方法繁琐且耗时。本研究开发了一种基于光热热重分析仪（PT-TGA）快速测定生物质中三种成分含量的方法。纤维素使用单个 F1 模型进行建模，而半纤维素和木质素根据其热解特性使用 F2 和 F1 模型进行两个连续过程的拟合。利用PT-TGA上纤维素、半纤维素和木质素快速热解获得的动力学参数，通过拟合不同峰的DTG曲线计算生物质样品中三种组分的含量。在300℃/min的升温速率下，测定时间在3min以内，稻草三种成分的相对含量偏差小于2.00%。并以椰壳和松木为例进行验证，动力学拟合法与化学法测定的最大差异仅为3.32%，表明该方法能够可靠、快速地测定木质纤维素生物质中三种成分的含量。本研究为测定生物质组分相对含量提供了一种快速有效的方法。

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Quick measurement method of three components in lignocellulosic biomass based on kinetic mechanism analysis of PT-TGA

Cellulose, hemicellulose, and lignin are the major components of lignocellulosic biomass, and fast and accurate measurement of the three components’ content is beneficial for the efficient application of biomass. However, the current chemical dissolution and titration method was tedious and time-consuming. In this study, a quick determination method of three components in biomass was developed for determining their contents based on a photo-thermal thermo-gravimetric analyzer (PT-TGA). Cellulose was modeled using a single F1 model, while hemicellulose and lignin were fitted with two consecutive processes according to their pyrolysis characteristic with F2 and F1 models. Using the kinetic parameters obtained from the fast pyrolysis of cellulose, hemicellulose and lignin on the PT-TGA, the contents of the three components in biomass samples were calculated by fitting the DTG curves with different peaks. Under the heating rate of 300 °C /min, the relative content deviation of the three components of rice straw was less than 2.00 % with the measurement time within 3 min. Furthermore, coconut shell and pine were used to verify that the maximum difference determined by the kinetic fitting method and the chemical method was only 3.32 %, demonstrating that the method could reliably and rapidly measure the contents of the three components in lignocellulosic biomass. This study provided a fast and effective method for determining the relative content of biomass components.

更新日期：2024-03-19

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