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摘要
The alkaline lignin was catalytical degraded by using catalyst- nXW 12O 40 (n= 3, X= Y; n=4, X= Si) which has Keggin structure. The total hydroxyl content of the degraded lignin was determined by means of combining acetylation with potentiometry titration, while the phenolic hydroxyl content was determined by UV spectrophotometry. Factors affecting the hydroxyl content of lignin such as degradation temperature, reaction time, amount of catalyst and the solvent in the system were studied. The optimum condition of alkaline lignin degradation by the H nXW 12O 40 was identified. And the catalytical degradation mechanism of lignin by H nXW 12O 40 was also discussed.
- 出版日期2009
- 单位东北林业大学
