硅钨酸催化碱木质素降解机制的研究  

The study on degradation mechanism of Lignin catalyzed by Silicotungstic acid

作　　者：郭元茹[1] 余方丹[1] 

机构地区：[1]东北林业大学材料科学与工程学院,哈尔滨150040

出　　处：《黑龙江大学自然科学学报》2010年第6期710-712,717,共4页Journal of Natural Science of Heilongjiang University

基　　金：国家自然科学基金青年科学基金资助项目(30901136);黑龙江省青年基金资助项目(QC08C15);东北林业大学新教师基金资助项目(200802251002)

摘　　要：以Keggin结构硅钨酸作催化剂,在醇-水体系中降解活化碱木质素。根据官能团定量分析和XPS仪器分析方法,结合Gaussian98中B3LYP/LANL2DZ方法解析了降解过程中的反应机制。计算和实验结果揭示硅钨酸中钨（VI）可以接受1-2个电子还原为钨（V）;而木质素失去电子,形成醌基环己二稀基自由基,经结构重排于α位形成醇羟基,导致产物中羟基含量增加。Degradation experiments of basic lignin were carried out and Silicotungstic acid was used as catalyst.The functional group analysis,the XPS and B3LYP/LANL2DZ method of Gaussian 98 were used to analyze the mechanism of degradation.The results reveal that tungsten（VI） could change into W（V） by receiving one or two electrons.After losing electrons,lignin could form aliphatic hydroxyl groups at α location by structure rearrangement and cause aliphatic hydroxyl group content increase.

关 键 词：硅钨酸 木质素 催化 降解 B3LYP 

分 类 号：X793[环境科学与工程—环境工程]