Catalytic depolymerization of organosolv sugarcane bagasse lignin in cooperative ionic liquid pairs
Catalytic depolymerization of organosolv sugarcane bagasse lignin in cooperative ionic liquid pairs
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协同离子液体对中有机溶剂甘蔗渣木质素的催化解聚
DOI：
10.1016/j.cattod.2017.04.059
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发表时间：
2017
期刊：
影响因子：
5.3
通讯作者：
Li Xuehui
中科院分区：
文献类型：
--
作者：
Li Yingwen;Cai Zhenping;Liao Mochen;Long Jinxing;Zhao Weijie;Chen Yuan;Li Xuehui
木质素被认为是高附加值芳烃化工生产的一种有前途的可持续原料。在此，我们提出了一种新的和有效的方法，木质素解聚在合作的离子液体对的存在下，它提供了良好的催化活性和焦炭抑制能力。在最佳反应条件下，木质素转化率为66.7%，木质素得率为14.5wt.%酚类单体、大量挥发性产物（通过GC-MS鉴定）和可忽略的焦炭形成。通过HSQC、~ 1H NMR、FT-IR、GPC和元素分析等手段对甘蔗木质素的结构进行了比较研究。所有三种结构木质素单元在此过程中被降解，其中H-木质素被发现是最敏感的。对于协同离子液体体系，即使在第五次运行后也发现令人满意的木质素解聚性能，证明了合理的可重复使用性。
Lignin has been considered as a promising sustainable feedstock for high value-added aromatic chemical production. Here, we propose a novel and efficient process for lignin depolymerization in the presence of cooperative ionic liquid pair, which affords excellent catalytic activity and char inhibition capability. Under the optimized reaction condition, 66.7% lignin conversion is achieved, yielding 14.5 wt.% phenolic monomer, numerous volatile products (identified by GC–MS) and negligible char formation. The structural evolution of the sugarcane lignin was intensively investigatedviacomparative characterization of raw and regenerated lignin using HSQC,1H NMR, FT-IR, GPC and elemental analysis. All three structural lignin units are degraded in this process, where, H-lignin is found to be the most susceptible. Satisfactory lignin depolymerization performance was found for the cooperative ionic liquid system, even after the fifth run, demonstrating a reasonable reusability.