Kinetic analysis of the pyrolysis of wood/inorganic composites under non-isothermal conditions
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ORIGINAL
Kinetic analysis of the pyrolysis of wood/inorganic composites under non‑isothermal conditions Tao Yang1 · Guangming Yuan1,2 · Mingchu Xia1 · Mingming Mu1 · Shiyao Chen1 Received: 10 March 2020 / Accepted: 3 October 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract The pyrolysis kinetics of wood/inorganic composites was measured using one or two kinds of inorganic modifiers (CaCO3, SiO2–TiO2, and Mg–Al compounds) to study the pyrolysis behavior. Thermogravimetric experiments were carried out under nitrogen conditions and operated at different heating rates, ranging from 10 to 40 K/min. Model-free methods (Starink, Flynne-Wall-Ozawa, and modified Coats-Redfern) were used to evaluate the kinetic parameters, including apparent activation energy (Ea) and reaction order. For the range of conversion fractions investigated (20%-80%), the results yielded E a values of 114–117 kJ/mol, 151–158 kJ/mol, 174–175 kJ/mol, and 153–156 kJ/mol for the unmodified poplar wood and modified poplar wood composites with CaCO3, SiO2–TiO2, and Mg–Al inorganic compounds, respectively. The corresponding reaction order values were 0.4485–0.8677, 0.0150–0.3694, 0.2021–0.5579, and 0.4336–0.8293, respectively. Wood impregnated with inorganic substances had good chemical modification effect. In addition, the kinetic mechanism function of the wood pyrolysis reaction was also studied. Results show that the heating diffusion mechanism model better describes the entire pyrolysis process of the modified wood compared with the control wood, which could be attributed to difficulty in the heat transfer process because of the thermal barrier effect of the inorganic layer and the resistance of gaseous products during pyrolysis. The stability of the wood/inorganic composites is therefore effectively improved.
1 Introduction Wood from fast-growing poplar trees is highly valuable with a wide range of uses. However, because of its poor thermal stability, dimensional stability, and flame-retardant performance, poplar wood must be chemically or physically modified to improve its use value. Sol–gel and impregnation methods (e.g., acetylation, alkylation, in-situ synthesis of macromolecules, heat treatment, inorganic modification) have been commonly used to improve the thermal stability and flame-retardant performance of wood (Trey et al. 2012; Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00107-020-01606-w) contains supplementary material, which is available to authorized users. * Guangming Yuan [email protected] 1
School of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, Hunan, China
Collaborative Innovation Center for Effective Utilizing of Wood and Bamboo Resource of China, Changsha 410004, Hunan, China
2
Chen et al. 2016; Hung et al. 2017; Yu et al. 2018; Keplinger et al. 2014; Moghaddam et al. 2016). Recent studies have focused on the potential to modify wood using non-toxic, mild nano-inorganic mod
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