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

• Published in: Fuel (Guildford) Vol. 367; p. 131521
• Main Authors: Song, Gongxiang, Huang, Dexin, Li, Aishu, Li, Ruochen, Hu, Song, Xu, Kai, Ren, Qiangqiang, Han, Hengda, Wang, Yi, Su, Sheng, Xiang, Jun
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.07.2024
• Subjects: Biomass; Measurement method; PT-TGA; Pyrolysis; Three-components; Pyrolysis; Biomass; Measurement method; PT-TGA; Three-components
• ISSN: 0016-2361; 1873-7153
• DOI: 10.1016/j.fuel.2024.131521

[Display omitted] •Quick measurement method of three components was established based on PT-TGA.•The method can be applicated with high heating rates up to 300 °C/min.•The time for three-component content measuring test can be as short as 3 min.•Maximum deviation of relative contents of three components was less than 3.32%. 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.