Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin Key Laboratory of Applied Catalysis Science and Technology, State Key Laboratory of Chemical Engineering (Tianjin University), School of Chemical Engineering, Tianjin University, Tianjin 300072 (China).
Angew Chem Int Ed Engl. 2014 Jul 7;53(28):7310-5. doi: 10.1002/anie.201402752. Epub 2014 Jun 2.
We report the complete ethanolysis of Kraft lignin over an α-MoC1-x /AC catalyst in pure ethanol at 280 °C to give high-value chemicals of low molecular weight with a maximum overall yield of the 25 most abundant liquid products (LP25) of 1.64 g per gram of lignin. The LP25 products consisted of C6 -C10 esters, alcohols, arenes, phenols, and benzyl alcohols with an overall heating value of 36.5 MJ kg(-1) . C6 alcohols and C8 esters predominated and accounted for 82 wt % of the LP25 products. No oligomers or char were formed in the process. With our catalyst, ethanol is the only effective solvent for the reaction. Supercritical ethanol on its own degrades Kraft lignin into a mixture of small molecules and molecular fragments of intermediate size with molecular weights in the range 700-1400, differing in steps of 58 units, which is the weight of the branched-chain linkage C3 H6 O in lignin. Hydrogen was found to have a negative effect on the formation of the low-molecular-weight products.
我们报告了在 280°C 的纯乙醇中，通过α-MoC1-x/AC 催化剂完全醇解 Kraft 木质素，得到了低分子量的高价值化学品，25 种最丰富的液体产物（LP25）的总产率最高为每克木质素 1.64 克。LP25 产物由 C6-C10 酯、醇、芳烃、酚和苄醇组成，总热值为 36.5 MJ·kg-1。C6 醇和 C8 酯占主导地位，占 LP25 产物的 82wt%。在这个过程中没有形成低聚物或焦。使用我们的催化剂，乙醇是反应的唯一有效溶剂。单独的超临界乙醇将 Kraft 木质素降解为分子量在 700-1400 之间的小分子和中等大小的分子片段的混合物，分子量相差 58 个单位，这是木质素中支链连接 C3 H6 O 的重量。发现氢气对低分子量产物的形成有负面影响。
