Analysis of pyrolysis mechanism of 5-hydroxymethyl furfural by using PY-GC-MS and in-situ FT-IR

作者：Liao, Yan-Fen; Guo, Zhen-Ge; Cao, Ya-Wen; Ma, Xiao-Qian; Lin, Yan

来源：Journal of South China University of Technology(Natural Science Edition), 2015, 43(6): 15-21.

DOI：10.3969/j.issn.1000-565X.2015.06.003

• In-situ FT-IR
• Product composition
• Py-GC-MS
• Pyrolysis experiments
• Pyrolysis mechanism
• Pyrolysis products
• Side chain degradation
• Temperature range

Pyrolysis experiments of 5-hydroxymethyl furfural (5-HMF) were conducted and the product composition was detected by using a PY-GC-MS analyzer. The results show that nearly 86% of the pyrolysis product is furan ring-contained substance, and that a certain amount of small molecules exist in the product, which means that the pyrolysis process of 5-HMF is mainly a side-chain degradation process concomitantly with the fracture of furan rings. Moreover, the converting law of the product in the pyrolysis process was supervised in real time via in-situ FT-IR. The results show that furfural and 5-methyl furfural mainly form when the temperature ranges from 130 to 230 ℃, furfuryl alcohol and 5-formyl-2-furfurylacetate mainly form after 250 ℃and the formation continues to the middle and later periods of the whole process, while the dominant pyrolysis product of 5-HMF, namely furan-2, 5-dicarbaldehyde, forms throughout the whole pyrolysis process. According to the results obtained from fast pyrolysis experiment and in-situ FT-IR, the pyrolysis mechanism is speculated as follows: as the most primary reaction, furan-2, 5-dicarbaldehyde forms from two consecutive dehydrogenations and then converts into 5-methyl furfural after the dehydroxylation and hydrogenation of hydroxymethyl;the whole fracture of hydroxymethyl side chain and aldehyde group side chain leads to the formation of furfural and furfuryl alcohol;and 2-methylfuran may be produced via the secondary pyrolysis of furfural and furfuryl alcohol.

• 出版日期2015-6-1
• 单位华南理工大学