Li Song, Li Wenzhi, Zhang Qi, Shu Riyang, Wang Huizhen, Xin Haosheng, Ma Longlong
Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences Guangzhou 510640 PR China
CAS Key Laboratory of Renewable Energy Guangzhou 510640 PR China.
RSC Adv. 2018 Jan 3;8(3):1361-1370. doi: 10.1039/c7ra11947j. eCollection 2018 Jan 2.
The lignin-first biorefinery method appears to be an attractive approach to produce phenolic chemicals. Herein, corn stover was employed for the production of phenolic monomers using an unsupported non-noble MoS catalyst. The yield of phenolic monomers was enhanced from 6.65% to 18.47% with MoS at 250 °C and about 75% lignin was degraded with more than 90% glucan reserved in the solid residues. The Fourier-Transform Infrared (FT-IR) and heteronuclear single quantum coherence-nuclear magnetic resonance (H-C HSQC-NMR) characterization suggested that the cleavage of the β-O-4, γ-ester and benzyl ether linkages were enhanced, promoting the delignification and the depolymerization of lignin. The catalyst performance was relatively effective with 14.30% phenolic monomer yield after the fifth run. The effects of the reaction temperature, the initial hydrogen pressure, the dosage of catalyst, and the reaction time were investigated. The model reactions were also proposed for the potential mechanism study. This work provides some basic information for the improvement of the graminaceous plant lignin-first process with a non-noble metal catalyst.
木质素优先生物精炼方法似乎是生产酚类化学品的一种有吸引力的方法。在此，使用无负载的非贵金属MoS催化剂，以玉米秸秆为原料生产酚类单体。在250℃下，使用MoS时酚类单体的产率从6.65%提高到18.47%，约75%的木质素被降解，固体残渣中保留了90%以上的葡聚糖。傅里叶变换红外光谱（FT-IR）和异核单量子相干核磁共振（H-C HSQC-NMR）表征表明，β-O-4、γ-酯和苄基醚键的断裂增强，促进了木质素的脱木质素和 depolymerization。第五次运行后，催化剂性能相对有效，酚类单体产率为14.30%。研究了反应温度、初始氢气压力、催化剂用量和反应时间的影响。还提出了模型反应用于潜在的机理研究。这项工作为使用非贵金属催化剂改进禾本科植物木质素优先工艺提供了一些基本信息。
