Journal
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
Volume 137, Issue 3, Pages 811-823Publisher
SPRINGER
DOI: 10.1007/s10973-019-08010-4
Keywords
Tobacco stem; Chemical pretreatment; Thermal conversion; TG-MS; Gaseous product distributions; Kinetics of pyrolysis
Funding
- National Key Technology Support Program of China [2015BAL04B02]
- National Natural Science Foundation of China [21376274]
- Collaborative Innovation Center of Building Energy Conservation and Environmental Control
- Graduate Self-Exploration and Innovation Program of Central South University [2017zzts168]
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The pyrolysis of tobacco stem (TS), a potential source of lignocellulosic biomass, is investigated, focusing on gas formation via thermogravimetric analysis-mass spectrometry to obtain accurate gaseous product distributions under various conditions. The results revealed that the majority of the gaseous products were formed under 900K with a shoulder pyrolysis region (600-800K) as the main source of gas formation, where the formation curve of CO2 was used to track the pyrolysis of hemicellulose, cellulose, and lignin. The formation of four aromatics from lignin occurred over the range of 500-900K, roughly in the sequence of phenol, toluene, xylene, and benzene. Furthermore, the demineralization of TS with HCl did not lead to optimal results, with increased phenol and decreased syngas production, whereas pretreatment with NaOH for hydrolysis was found to significantly increase methane production and decrease the amount of aromatics formed, suggesting that this method should lead to superior results and a simpler reaction mechanism.
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