Thermogravimetric pyrolysis kinetics study of tobacco stem via multicomponent kinetic modeling, Asym2sig deconvolution and combined kinetics

Chaowei Ma; Fengxia Zhang; Huili Liu; Hua Wang; Jianhang Hu

doi:10.1016/j.biortech.2022.127539

Thermogravimetric pyrolysis kinetics study of tobacco stem via multicomponent kinetic modeling, Asym2sig deconvolution and combined kinetics

Bioresour Technol. 2022 Sep:360:127539. doi: 10.1016/j.biortech.2022.127539. Epub 2022 Jun 28.

Authors

Chaowei Ma¹, Fengxia Zhang², Huili Liu³, Hua Wang³, Jianhang Hu⁴

Affiliations

¹ Engineering Research Center of the Ministry of Education for Metallurgical Energy Conservation and Emission Reduction, Kunming University of Science and Technology, Kunming 650093, Yunnan Province, PR China.
² Engineering Research Center of the Ministry of Education for Metallurgical Energy Conservation and Emission Reduction, Kunming University of Science and Technology, Kunming 650093, Yunnan Province, PR China; Kunming Metallurgy College, 650033 Kunming, PR China.
³ Engineering Research Center of the Ministry of Education for Metallurgical Energy Conservation and Emission Reduction, Kunming University of Science and Technology, Kunming 650093, Yunnan Province, PR China; State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, Yunnan Province, PR China.
⁴ Engineering Research Center of the Ministry of Education for Metallurgical Energy Conservation and Emission Reduction, Kunming University of Science and Technology, Kunming 650093, Yunnan Province, PR China; State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650093, Yunnan Province, PR China. Electronic address: hujh51@126.com.

PMID: 35777640
DOI: 10.1016/j.biortech.2022.127539

Abstract

Tobacco stems (TS) are tobacco residues produced, whereby the assessment of the pyrolysis kinetics of TS is critical to realize high-value utilization of agricultural residues. Firstly, a thermogravimetric analyzer was employed to perform the non-isothermal pyrolysis of TS at various heating rates. Then, the deconvolution function by Asym2sig showed that the pyrolysis of TS can be accurately modeled for three parallel decomposition fractions. Furthermore, the pyrolysis product was analyzed using fourier transform infrared spectrometer (FTIR). The results showed that the average activation energy evaluated by the isoconversion methods exhibited the highest average activation energy of 191.762 kJ·mol^-1 for lignin (LG), followed by 189.268 kJ·mol^-1 for cellulose (CL) and then 176.357 kJ·mol^-1 for hemicellulose (HC). Based on the experimental results, the pre-exponential factors and reaction models for HC, CL and LG were also calculated and developed separately. From thermodynamic standpoint, raw materials for bioenergy generation can be derived from TS.

Keywords: Kinetic triplets; Pyrolysis kinetics; TG-FTIR analysis; The independent para-reaction model; Tobacco stems.

MeSH terms

Biomass
Cellulose / chemistry
Kinetics
Lignin / chemistry
Nicotiana*
Pyrolysis*
Thermogravimetry

Substances

Cellulose
Lignin