Depolymerization of lignin by catalytic oxidation with aqueous polyoxometalates

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• 作者：Yan Zhao ; Qing Xu ; Tao Pan ; Yong Zuo ; Yao Fu ; Qing-Xiang Guo
• 关键词：Lignin ; Polyoxometalates ; Oxidation ; Aromatic chemicals
• 刊名：Applied Catalysis A: General
• 出版年：2 October, 2013
• 年：2013
• 卷：467
• 期：Complete
• 页码：504-508
• 全文大小：536 K

文摘

In this work a method for the depolymerization of lignin by catalytic oxidation was studied. Using H₅PMo₁₀V₂O₄₀ as the catalyst, various lignin spices including pyrolytic lignin, hydrolytic lignin, alkali lignin, sodium lignosulfonate and calcium lignosulfonate were tested for the oxidative degradation. The influence of reaction conditions, i.e. reaction temperature, solvent, reaction time, initial O₂ pressure and catalyst concentration were investigated. Under optimized conditions, the highest yield of 65.21% of the oxidative degradation products was achieved from pyrolytic lignin, and the main products were aromatic compounds and dimethyl succinate. Moreover, the H₅PMo₁₀V₂O₄₀ catalyst was recycled for five times without significant deactivation.