School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, Guangdong, China.
School of Civil and Transportation Engineering, Guangdong University of Technology, Guangzhou 510006, Guangdong, China.
Bioresour Technol. 2021 Mar;323:124569. doi: 10.1016/j.biortech.2020.124569. Epub 2020 Dec 28.
Catalytic hydrothermal liquefaction (HTL) of lignin was examined at various temperature (250-310 °C) and reaction time in the presence of different solvents (water, methanol and ethanol) with different metal supported on MCM-41 mesoporous catalyst. In case of ethanol solvent, the maximum bio-oil yield of 56.2 wt% was obtained with Ni-Al/MCM-41. However in case of water, bio-oil yield was (44.3 wt%); while significantly improves bio-oil yield for methanol solvent (48.1 wt%). It is indicated that alcoholic solvents promoted the lignin decomposition, while in the presence of catalyst; water solvent significantly improves lignin degradation. Loading of Ni and Al on MCM-41, the acid strength of the catalyst increased, which enhanced lignin degradation. From the GC-MS analysis, the main G-type (ca.54%) phenolic compounds were produced with higher percentage of aromatic hydrocarbon compounds. CHNS and GPC analysis showed that catalytic liquefaction encouraged hydrodeoxygenation, which produced lower oxygen content bio-oil with lower molecular weight.
木质素的催化水热液化（HTL）在不同温度（250-310°C）和反应时间下，在不同溶剂（水、甲醇和乙醇）和不同负载在 MCM-41 介孔催化剂上的金属存在下进行了研究。在乙醇溶剂的情况下，Ni-Al/MCM-41 获得了最大生物油产率为 56.2wt%。然而，在水的情况下，生物油产率为（44.3wt%）；而在甲醇溶剂中显著提高了生物油产率（48.1wt%）。结果表明，醇类溶剂促进了木质素的分解，而在催化剂存在下，水溶剂显著提高了木质素的降解。在 MCM-41 上负载 Ni 和 Al 后，催化剂的酸强度增加，从而增强了木质素的降解。通过 GC-MS 分析，主要生成 G 型（约 54%）酚类化合物，芳烃化合物的比例更高。CHNS 和 GPC 分析表明，催化液化促进了加氢脱氧，产生了含氧量较低、分子量较低的生物油。
