Kinetics and Thermodynamic Analysis of Recent and Ancient Buried Phoebe zhennan Wood

Hui Xiao; Ke Jiang; Yuzhu Chen; Zhenghui Lei; Kexin Chen; Xue Cheng; Jinqiu Qi; Jiulong Xie; Xingyan Huang; Yongze Jiang

doi:10.1021/acsomega.0c02395

Kinetics and Thermodynamic Analysis of Recent and Ancient Buried Phoebe zhennan Wood

ACS Omega. 2020 Aug 13;5(33):20943-20952. doi: 10.1021/acsomega.0c02395. eCollection 2020 Aug 25.

Authors

Hui Xiao^{1

2}, Ke Jiang^{1

2}, Yuzhu Chen^{1

2}, Zhenghui Lei^{1

2}, Kexin Chen^{1

2}, Xue Cheng^{1

2}, Jinqiu Qi^{1

2}, Jiulong Xie^{1

2}, Xingyan Huang^{1

2}, Yongze Jiang^{1

2}

Affiliations

¹ College of Forestry, Sichuan Agricultural University, Chengdu 611130, Sichuan, China.
² Wood Industry and Furniture Engineering Key Laboratory of Sichuan Provincial Department of Education, Sichuan Agricultural University, Chengdu 611130, Sichuan, China.

Abstract

Kinetics and thermogravimetric analysis of recent Phoebe zhennan wood (RZ) and ancient buried P. zhennan wood (ABZ) were investigated under a nitrogen atmosphere at different heating rates of 5, 10, 15, and 20 K/min. The activation energy values were estimated based on the Flynn-Wall-Ozawa model-free method, and then, the Coats-Redfern model-fitting method was used to predict the reaction mechanism. The best model of RZ for regions 1 and 2 was based on the diffusional and reaction order (second-order) mechanism, respectively, while a diffusional (Jander equation) mechanism is the best model for ABZ. The change in enthalpy and activation energy of the RZ was lower than that of the ABZ at different conversion rates. When the conversion rate was less than 0.4, the RZ may require lower thermal decomposition reaction energy, but the overall energy of thermal decomposition reactions and the degree of disorder was not much different.