中文摘要：

采用PY-GC-MS（快速热裂解-色质联用）对5-羟甲基糠醛（5-HMF）进行热裂解实验，发现裂解产物中将近86％为呋喃环类物质，同时存在小分子物质，表明其热解主要为侧链降解，但也存在呋喃环的开环断裂．结合原位红外光谱分析，实时监测5-HMF热裂解产物随反应过程的转化规律，发现在130～230℃之间主要生成糠醛、5-甲基糠醛，250qC后主要生成2．糠醇及5-乙酰甲氧基．2．糠醛，这两者的生成持续至反应中后期；作为5．HMF热解最主要产物的2，5-呋喃二甲醛的生成则在整个反应过程持续进行．结合快速热解及原位红外实验结果，推测5-HMF的热解机理如下：侧链羟甲基处连续两次脱氢生成2，5-呋喃二甲醛是最主要的反应，羟甲基去羟基后加氢生成5-甲基糠醛，羟甲基侧链及醛基侧链的整体断裂分别生成糠醛及糠醇，在此基础上还会发生二次裂解反应生成2-甲基呋喃．

英文摘要：

Pyrolysis experiments of 5-hydroxymethyl furfural （5-HMF） were conducted and the product composi- tion was detected by using a PY-GC-MS analyzer. The results show that nearly 86% of the pyrolysis product is fu- ran 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 ~C, furfuryl alcohol and 5-formyl-2-furfurylacetate mainly form after 250 ~C 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 ~F-IR, the pyrolysis mechanism is speculated as follows： as the most primary reaction, fu- ran-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 alde- hyde 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.