Effects of mesostructured silica catalysts on the depolymerization of organosolv lignin fractionated from woody eucalyptus
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2015
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Resumo |
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 oC for 1 h 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, C-O stretching of syringyl ring and aromatic C-H deformation of syringol unit, and an increase in band intensities associated with the guaiacyl ring, confirming the type of products formed. |
Formato |
application/pdf |
Identificador | |
Publicador |
Elsevier |
Relação |
http://eprints.qut.edu.au/81656/3/81656.pdf DOI:10.1016/j.biortech.2014.12.098 Klamrassamee, Thepparat, Laosiripojana, Navadol, Cronin, Dylan, Moghaddam, Lalehvash, Zhang, Zhanying, & Doherty, William O.S. (2015) Effects of mesostructured silica catalysts on the depolymerization of organosolv lignin fractionated from woody eucalyptus. Bioresource Technology, 180, pp. 222-229. |
Direitos |
Copyright 2015 Elsevier This is the author’s version of a work that was accepted for publication in Bioresource Technology. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Bioresource Technology, [VOL 180, (2015)] DOI: 10.1016/j.biortech.2014.12.098 |
Fonte |
School of Chemistry, Physics & Mechanical Engineering; Centre for Tropical Crops and Biocommodities; Institute for Future Environments; Science & Engineering Faculty |
Palavras-Chave | #lignin #depolymerization #syringol #mesostructured silica #phenolic compounds |
Tipo |
Journal Article |