title: Effects of mesostructured silica catalysts on the depolymerization of organosolv lignin fractionated from woody eucalyptus.
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 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.
authors.affiliation: The Joint Graduate School of Energy and Environment (JGSEE), King Mongkut's University of Technology Thonburi, Prachauthit Road, Bangmod, Bangkok 10140, Thailand.
authors.forename: Thepparat
authors.initials: T
authors.lastname: Klamrassamee
authors.affiliation: The Joint Graduate School of Energy and Environment (JGSEE), King Mongkut's University of Technology Thonburi, Prachauthit Road, Bangmod, Bangkok 10140, Thailand.
authors.forename: Navadol
authors.initials: N
authors.lastname: Laosiripojana
authors.affiliation: Centre for Tropical Crops and Biocommodities, Queensland University of Technology, Brisbane, Australia.
authors.forename: Dylan
authors.initials: D
authors.lastname: Cronin
authors.affiliation: Centre for Tropical Crops and Biocommodities, Queensland University of Technology, Brisbane, Australia.
authors.forename: Lalehvash
authors.initials: L
authors.lastname: Moghaddam
authors.affiliation: Centre for Tropical Crops and Biocommodities, Queensland University of Technology, Brisbane, Australia.
authors.forename: Zhanying
authors.initials: Z
authors.lastname: Zhang
authors.affiliation: Centre for Tropical Crops and Biocommodities, Queensland University of Technology, Brisbane, Australia. Electronic address: w.doherty@qut.edu.au.
authors.forename: William O S
authors.initials: WO
authors.lastname: Doherty
mesh_terms: D002384:Catalysis; D005052:Eucalyptus / Q000737:chemistry*; D008401:Gas Chromatography-Mass Spectrometry; D008031:Lignin / Q000737:chemistry*; D000432:Methanol / Q000737:chemistry; D010636:Phenols / Q000032:analysis / Q000737:chemistry; D058105:Polymerization; D012822:Silicon Dioxide / Q000737:chemistry; D012997:Solvents / Q000737:chemistry; D017550:Spectroscopy, Fourier Transform Infrared; D014934:Wood / Q000737:chemistry
chemical_list: D010636:Phenols; C509969:SBA-15; D012997:Solvents; D012822:Silicon Dioxide; D008031:Lignin; D000432:Methanol
keywords: Depolymerization; Fractionation; Lignin; Mesostructured silica; Syringol