School of Chemistry & Chemical Engineering, Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, Guangxi University, 100 Daxuedong Road, Nanning, 530004, China; Guangxi Academy of Sciences, Nanning 530007, China.
School of Chemistry & Chemical Engineering, Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, Guangxi University, 100 Daxuedong Road, Nanning, 530004, China.
Int J Biol Macromol. 2023 Dec 31;253(Pt 1):126656. doi: 10.1016/j.ijbiomac.2023.126656. Epub 2023 Sep 1.
Constructing an advanced catalytic system for the purposeful liquefaction of lignin into chemicals has presented a significant prospect for sustainable development. In this work, the catalytic process of mesoporous homologous biochar (HBC) derived from alkali lignin supported copper catalysts (Cu/HBC) was reported for catalytic liquefaction of alkali lignin to monophenols. The characterization results revealed HBC promoted the formation of metal-support strong interaction and the generation of oxygen vacancies, enhancing the acid sites of Cu/HBC. Under the optimal conditions (0.2 g alkali lignin, 280 °C, 0.05 g Cu/HBC, 6 h, 18 mL water), the monophenol yield reached 75.01 ± 0.76 mg/g, and the bio-oil yield was 57.98 ± 1.76%. The copious mesopores, high surface area, and rich acidic sites were responsible for the high activity of Cu/HBC, which significantly outperformed the controlled catalysts, such as HBC, commercial activated carbon (AC), and reported Ni/AC, Ni/MCM-41, etc. In four consecutive runs, the catalytic performance of Cu/HBC was only reduced by 3.65% per cycle. Interestingly, catechol was selectively produced with Cu/HBC, which provided an effective strategy for the conversion of G/S-type lignin to catechyl phenolics (C-type). These findings indicate that the Cu/HBC will be a promising substitution of noble metal-supported catalysts for conversion biomass into high value-added phenolics.
构建用于将木质素有目的地液化成化学品的先进催化体系为可持续发展提供了广阔的前景。在这项工作中，报道了碱木质素负载铜催化剂（Cu/HBC）衍生的介孔同系物生物炭（HBC）的催化过程，用于催化碱木质素液化生成单酚。表征结果表明，HBC 促进了金属-载体强相互作用的形成和氧空位的产生，增强了 Cu/HBC 的酸位。在最佳条件（0.2 g 碱木质素、280°C、0.05 g Cu/HBC、6 h、18 mL 水）下，单酚收率达到 75.01±0.76 mg/g，生物油收率为 57.98±1.76%。丰富的介孔、高比表面积和丰富的酸性位是 Cu/HBC 高活性的原因，其性能明显优于对照催化剂，如 HBC、商业活性炭（AC）和报道的 Ni/AC、Ni/MCM-41 等。在连续四次运行中，Cu/HBC 的催化性能每循环仅降低 3.65%。有趣的是，Cu/HBC 选择性地生成邻苯二酚，这为 G/S 型木质素转化为邻苯二酚型酚（C 型）提供了一种有效的策略。这些发现表明，Cu/HBC 将是一种有前途的替代贵金属负载催化剂，用于将生物质转化为高附加值酚类化合物。
