College of Materials Science and Engineering, Fuzhou University, Fuzhou 350108, China.
College of Materials Science and Engineering, Fuzhou University, Fuzhou 350108, China.
Int J Biol Macromol. 2021 Nov 1;190:72-85. doi: 10.1016/j.ijbiomac.2021.08.188. Epub 2021 Sep 1.
Lignin is the only renewable aromatic material in nature and contains a large number of oxygen-containing functional groups. High-value and green utilization of "lignin-to-chemicals" can be realized via using lignin to produce fine chemicals such as phenols and carboxylic acids, which can not only reduce the waste of lignin in the process of lignocellulosic biomass treatment, but gradually make the substitution of traditional fossil fuels come true. The hydrogenolysis process under catalysis of metal catalyst has high product selectivity and less impurity, which is suitable for the production of same type or single fine chemicals. Hydrogenolysis of lignin via metal catalysts to produce lignin oil, and further modification of functional groups (e.g. methoxyl, alkyl and hydroxyl group) of depolymerized monomers in the bio-oil to yeild phenols and terephthalic acid are reviewed, and catalytic mechanisms are briefly summarized in this paper. Finally, the problems of lignin catalytic conversion existing currently are investigated, and the future development of this field is also prospected.
木质素是自然界中唯一可再生的芳香族材料，含有大量含氧官能团。通过利用木质素生产酚类和羧酸类等精细化学品，可以实现“木质素转化为化学品”的高值化和绿色利用，不仅可以减少木质素在木质纤维素生物质处理过程中的浪费，而且可以逐步实现对传统化石燃料的替代。金属催化剂催化下的氢解过程具有较高的产物选择性和较少的杂质，适用于同类型或单一精细化学品的生产。本文综述了金属催化剂作用下木质素的氢解生成木质素油，以及进一步对解聚单体的功能基团（如甲氧基、烷基和羟基）进行修饰生成酚类和对苯二甲酸，简要总结了其催化机制。最后，探讨了木质素催化转化目前存在的问题，并对该领域的未来发展进行了展望。
