期刊
GREEN CHEMISTRY
卷 15, 期 1, 页码 125-136出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c2gc36332a
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资金
- Defense Advanced Research Projects Agency (DARPA)
- Army Research Lab (ARL) through the Defense Science Office Cooperative Agreement [W911NF-09-2-0010/09-005334 B 01]
The pyrolysis behavior of a beta-O-4 type oligomeric lignin model compound is studied at a temperature range from 250 degrees C to 550 degrees C. Thermogravimetric analysis (TGA) indicates the model compound has three distinct thermal decompositions peaks when a slow temperature ramp is applied while only one decomposition peak is observed when a higher temperature ramp is used. The pyrolysis behavior of this model compound is similar to that of lignin prepared by enzymatic hydrolysis of Maplewood. H-1-NMR shows that the beta-O-4 linkage thermally decomposes at a temperature between 250 degrees C and 350 degrees C with the formation of solid products at 350 degrees C. This solid product undergoes transformation to a polyaromatic from 350 degrees C to 550 degrees C. Around twenty five volatile compounds are quantified by pyroprobe-GC-MS with vanillin and 2-methoxy-4-methyl phenol being the most abundant monomeric products. A free radical reaction pathway is proposed to explain the product chemistry for pyrolysis of the lignin model compound. Char is most likely formed by random repolymerization of the radicals.
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