1. Measurement of pyrolysis properties and kinetics for as-obtained holocellulose and as-obtained lignin
- Author
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Wang, Liangcai, Qin, Hengfei, Ma, Huanhuan, and Zhou, Jianbin
- Abstract
This work aimed to deeper insight into the interaction processes between lignin and holocellulose in lignocellulosic biomass. As a result, apricot shell lignin (ASL) and apricot shell holocellulose (ASH) were prepared. Subsequently, the thermal behaviors of apricot shell (AS), ASL, ASH, and ASL/ASH blends were determined by thermogravimetric analysis (TGA) using mass changes as a monitoring parameter. The activation energy was calculated by employing the model-free integral methodology, and the reaction models were estimated using Criado mater plots (hereinafter referred to as mater plots). Additionally, using the resulting activation energies, the changes of pre-exponential factor (A), enthalpy (ΔH), Gibbs free energy (ΔG), and entropy (ΔS) were determined. When the weight ratio of ASL to ASH was below ~ 1.1, the degradation of ASL and ASH begins to show synergistic effects. Extractives and volatiles in ASH endow a significant effect on improving the reaction dynamics in co-pyrolysis processes, which was evidenced through an increase in decomposition intensity. Samples differ in their primary reaction mechanisms upon small (α≤ 0.5) and large (α≥ 0.5) conversion rates. Furthermore, there was a linear positive correlation between the Avalue and activation energy. Thermal decomposition of AS, ASL, ASH, and ASL/ASH mixtures afforded positive ΔGand ΔH.
- Published
- 2022
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