Structural evolution of chars from biomass components pyrolysis in a xenon lamp radiation reactor

• Published in: Chinese journal of chemical engineering 2017-02, Vol.25 (2), p.232-237
• Main Authors: Lin, Haizhou, Wang, Shurong, Zhang, Li, Ru, Bin, Zhou, Jinsong, Luo, Zhongyang
• Format: Article
• Language: English
• Subjects: Biomass components; Char; Pyrolysis; Structural characterization; 半纤维素; 氙灯; 热解行为; 生物反应器; 生物质组分; 组成分析; 结构演化; 辐射
• ISSN: 1004-9541; 2210-321X
• DOI: 10.1016/j.cjche.2016.08.002

The structural evolution of the chars from pyrolysis of biomass components （cellulose, hemicellulose and lignin） in a xenon lamp radiation reactor was investigated. The elemental composition analysis showed that the C content increased at the expense of H and O contents during the chars formation. The values of AH/C/ZSO/c for the formation of cellulose and hemicellulose chars were close to 2, indicating that dehydration was the dominant reaction. Meanwhile, the value was more than 3 for lignin char formation, suggesting that the occurrence of demethoxylation was prevalent. FTIR and XRD analyses further disclosed that the cellulose pyrolysis needed to break down the stable crystal structure prior to the severe depolymerization. As for hemicellulose and lignin pyrolysis, the weak branches and linkages decomposed firstly, followed by the major decomposition. After the devolatilization at the main pyrolysis stage, the three components encountered a slow carbonization process to form condensed aromatic chars. The SEM results showed that the three components underwent different devolatilization behaviors, which induced various surface mornhologies of the chars.