Wu Zhen, Zhang Jun, Pan Qingqing, Li Xun, Zhang Yu, Wang Fei
College of Chemical Engineering, Nanjing Forestry University, Jiangsu Provincial Key Lab for Chemistry and Utilization of Agro-forest Biomass, Jiangsu Key Lab of Biomass-Based Green Fuels and Chemicals, Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources Nanjing 210037 China
Jiangsu Key Laboratory for Biomass-based Energy and Enzyme Technology, School of Chemistry and Chemical Engineering, Huaiyin Normal University Huaian 223300 China.
RSC Adv. 2018 Apr 3;8(22):12344-12353. doi: 10.1039/c8ra00815a. eCollection 2018 Mar 26.
An efficient process for the depolymerization of alkaline extracted lignin (AEL) using attapulgite (ATP)-supported solid catalysts in ethanol was developed in this work. Different ATP-supported catalysts were prepared and used to catalyze the depolymerization of the lignin AEL. The results demonstrated that the addition of ATP-supported catalysts was favorable for controlling the distribution of valuable depolymerization products. The optimal solid catalyst SO /ZrO-ATP (Cat 2) exhibited high catalytic activity and selectivity, which showed a 78.6% conversion of AEL and a 29.4% selectivity to ethyl ferulate (ethyl 4-hydroxy-3-methoxycinnamate) with a catalyst/AEL ratio of 1 : 1 at 200 °C for 120 min. The catalyst could be reused and its catalytic activity did not obviously decreased after 6 successive runs. Particularly, a plausible mechanism involving esterification, hydrogenation, and dehydration for the production of aromatic esters from AEL depolymerization over SO /ZrO-ATP in ethanol was also proposed.
本工作开发了一种在乙醇中使用凹凸棒石（ATP）负载的固体催化剂使碱提取木质素（AEL）解聚的高效工艺。制备了不同的ATP负载催化剂，并用于催化木质素AEL的解聚。结果表明，添加ATP负载催化剂有利于控制有价值的解聚产物的分布。最佳固体催化剂SO /ZrO-ATP（催化剂2）表现出高催化活性和选择性，在200℃下120分钟，催化剂与AEL比例为1∶1时，AEL转化率为78.6%，对阿魏酸乙酯（4-羟基-3-甲氧基肉桂酸乙酯）的选择性为29.4%。该催化剂可重复使用，连续6次运行后其催化活性没有明显降低。特别是，还提出了一种在乙醇中通过SO /ZrO-ATP使AEL解聚生成芳香酯的涉及酯化、氢化和脱水的合理机理。
