The Joint Graduate School of Energy and Environment (JGSEE), King Mongkut's University of Technology Thonburi, Prachauthit Road, Bangmod, Bangkok 10140, Thailand.
Centre for Tropical Crops and Biocommodities, Queensland University of Technology, Brisbane, Australia.
Bioresour Technol. 2015 Mar;180:222-9. doi: 10.1016/j.biortech.2014.12.098. Epub 2015 Jan 6.
Isolated and purified organosolv eucalyptus wood lignin was depolymerized at different temperatures with and without mesostructured silica catalysts (i.e., SBA-15, MCM-41, ZrO2-SBA-15 and ZrO2-MCM-41). It was found that at 300°C for 1h with a solid/liquid ratio of 0.0175/1 (w/v), the SBA-15 catalyst with high acidity gave the highest syringol yield of 23.0% in a methanol/water mixture (50/50, wt/wt). Doping with ZrO2 over these catalysts did not increase syringol yield, but increased the total amount of solid residue. Gas chromatography-mass spectrometry (GC-MS) also identified other main phenolic compounds such as 1-(4-hydroxy-3,5-dimethoxyphenyl)-ethanone, 1,2-benzenediol, and 4-hydroxy-3,5-dimethoxy-benzaldehyde. Analysis of the lignin residues with Fourier transform-infrared spectroscopy (FT-IR) indicated decreases in the absorption bands intensities of OH group, CO stretching of syringyl ring and aromatic CH deformation of syringol unit, and an increase in band intensities associated with the guaiacyl ring, confirming the type of products formed.
用介孔硅（如 SBA-15、MCM-41、ZrO2-SBA-15 和 ZrO2-MCM-41）在有无催化剂的条件下，于不同温度下对分离提纯的有机溶剂法桉树木质素进行解聚。结果表明，在 300°C、固液比为 0.0175/1（w/v）、高酸度的 SBA-15 催化剂条件下，在甲醇/水（50/50，wt/wt）混合溶剂中，愈创木酚的产率最高，为 23.0%。在这些催化剂上掺杂 ZrO2 并没有增加愈创木酚的产率，而是增加了固体残渣的总量。气相色谱-质谱联用（GC-MS）还鉴定了其他主要酚类化合物，如 1-(4-羟基-3,5-二甲氧基苯基）-乙酮、1,2-苯二酚和 4-羟基-3,5-二甲氧基苯甲醛。傅里叶变换红外光谱（FT-IR）对木质素残渣的分析表明，愈创木基单元的酚羟基、愈创木基环的 CO 伸缩振动和芳香 CH 变形的吸收带强度降低，与愈创木基环有关的带强度增加，证实了形成产物的类型。
