Abstract
An effective method for the cleavage of the C–O bonds in lignin α-O-4 dimers and various alkaline lignins including the lignin from pulp industry was developed over a heterogeneous ReOx/AC catalyst. High yield of aromatic monomers (up to 98.0%) from α-O-4 model compounds and up to 80.1% lignin oil with 24.5% yield of monomers from realistic lignin were obtained under optimized conditions. Alkaline poplar lignin provided syringylpropane and 4-propenylsyringol with the highest yield of 6.6% and 7.4%, respectively. The active sites of ReOx/AC could be assigned to ReIV–VI according to XPS and EXAFS characterization. The lignin structures of different botanical species (hardwood, softwood and herbaceous crop) were compared and the activity of ReOx/AC on these lignins was investigated in detail. GPC and 2D HSQC NMR analysis of isolated lignin and lignin oil showed that hardwood lignin was more liable to be deconstructed than softwood and grass lignins due to the less amounts of β-5 linkages, lower molecular wei...
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
