Pyrolysis Mechanism of Hemicellulose Monosaccharides in Different Catalytic Processes

doi:10.1007/s40242-014-4019-9

高等学校化学研究 ›› 2014, Vol. 30 ›› Issue (5): 848-854.doi: 10.1007/s40242-014-4019-9

Pyrolysis Mechanism of Hemicellulose Monosaccharides in Different Catalytic Processes

WANG Shurong, RU Bin, LIN Haizhou, SUN Wuxing, YU Chunjiang, LUO Zhongyang

State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, P. R. China

收稿日期:2014-01-15 修回日期:2014-02-27 出版日期:2014-10-01 发布日期:2014-03-24
通讯作者: YU Chunjiang E-mail:chunjiang@zju.edu.cn
基金资助:
Supported by the National Natural Science Foundation of China(No.51276166), the National Basic Research Program of China(No.2013CB228101), the Program for New Century Excellent Talents in University, China(No.NCET-10-0741) and the Zhejiang Provincial Natural Science Foundation of China(No.R1110089).

Pyrolysis Mechanism of Hemicellulose Monosaccharides in Different Catalytic Processes

WANG Shurong, RU Bin, LIN Haizhou, SUN Wuxing, YU Chunjiang, LUO Zhongyang

State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, P. R. China

Received:2014-01-15 Revised:2014-02-27 Online:2014-10-01 Published:2014-03-24
Contact: YU Chunjiang E-mail:chunjiang@zju.edu.cn
Supported by:
Supported by the National Natural Science Foundation of China(No.51276166), the National Basic Research Program of China(No.2013CB228101), the Program for New Century Excellent Talents in University, China(No.NCET-10-0741) and the Zhejiang Provincial Natural Science Foundation of China(No.R1110089).

摘要/Abstract

摘要：

The pyrolysis behaviors of four different hemicellulose monosaccharides, namely, two pentoses(xylose and arabinose) and two hexoses(mannose and galactose) catalyzed by HZSM-5 were investigated. The effects of two different processes by which the catalyst comes into contact with the substrate, namely, mixed with monosaccharide(in-bed) or layered above monosaccharide(in situ), were compared. Evolution characteristics of typical pyrolytic products(H₂O, CO₂, acids, furans and aromatics) were achieved by thermogravimetry-Fourier transform infrared spectroscopy. The in-bed catalytic process significantly lowered the pyrolytic temperature and increased the production of furans and acids at a low temperature by enhancing dehydration, retro-aldol fragmentation and Grob fragmentation. During the in situ catalytic process, volatiles generated from monosaccharides passed through a catalyst bed and underwent further dehydration, decarboxylation, and decarbonylation, significantly lowering the yields of acids and furans. The yield of aromatics was enhanced, and the corresponding volatilization temperature was lowered, especially under the in-bed catalytic conditions. Pentoses entered into the zeolite pores more easily than hexoses did because of their smaller molecular size; thus, the in-bed catalytic process drastically affected pentose pyrolysis.

关键词: Hemicellulose, Monosaccharide, TG-FTIR, HZSM-5, Pyrolysis

Abstract:

Key words: Hemicellulose, Monosaccharide, TG-FTIR, HZSM-5, Pyrolysis

WANG Shurong, RU Bin, LIN Haizhou, SUN Wuxing, YU Chunjiang, LUO Zhongyang. Pyrolysis Mechanism of Hemicellulose Monosaccharides in Different Catalytic Processes[J]. 高等学校化学研究, 2014, 30(5): 848-854.

WANG Shurong, RU Bin, LIN Haizhou, SUN Wuxing, YU Chunjiang, LUO Zhongyang. Pyrolysis Mechanism of Hemicellulose Monosaccharides in Different Catalytic Processes[J]. Chemical Research in Chinese Universities, 2014, 30(5): 848-854.

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Pyrolysis Mechanism of Hemicellulose Monosaccharides in Different Catalytic Processes

Pyrolysis Mechanism of Hemicellulose Monosaccharides in Different Catalytic Processes

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