【作者】 方桂珍； 徐凤英； 任世学； 黄占华；

【Author】 Gui-zhen Fang, Feng-ying Xu, Shi-xue Ren Zhan-Hua Huang (Northeast Forestry University, Key Laboratory of Bio-based Material Science and Technology, Ministry of Education, Harbin 150040,China)

【机构】 东北林业大学生物质材料科学与技术教育部重点实验室；

【Abstract】 Change on chemical structure of straw alkali lignin in deoxidization reaction with cyclohexene catalyzed by CuO/C catalyst preparing by equal volume impregnation was studied by FTIR、UV、1H-NMR and HPLC.FTIR showed that, after reaction, total hydroxyl (including phenolic and aliphatic hydroxyl) of alkali lignin has increased, carbonyl has reduced, and the phenyl structure is steady. 1H-NMR spectra indicated the proton number of carbonyl has a downtrend, while the proton numbers of phenolic and aliphatic hydroxyl have increased, suggesting the carbonyl was deoxidized to hydroxyl. HPLC showed number-average molecular weight of alkali lignin has increased, while weight -average molecular weight has decreased, indicating polydispersity of alkali lignin is declined after activation. CuO/C catalyst shows excellent catalytic activity on reductive reaction of alkali lignin, that chemical structure has been changed, activated function groups has increased, phenyl structure of lignin is steady, and the reactive activity of alkali lignin has improved.更多还原