Effects of mesostructured silica catalysts on the depolymerization of organosolv lignin fractionated from woody eucalyptus
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Author list: Klamrassamee T., Laosiripojana N., Cronin D., Moghaddam L., Zhang Z., Doherty W.O.S.
Publisher: Elsevier
Publication year: 2015
Journal: Bioresource Technology (0960-8524)
Volume number: 180
Start page: 222
End page: 229
Number of pages: 8
ISSN: 0960-8524
Languages: English-Great Britain (EN-GB)
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Abstract
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 300ฐC 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. ฉ 2015 Elsevier Ltd.
Keywords
Depolymerization, fractionation, Mesostructured silica, Syringol
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