Abstract
A new dual catalyst system composed of choline-derived ionic liquids (ILs) and Pd/C was developed for the selective hydrogenolysis of Kraft lignin to monophenols. Among a series of investigated choline-derived ILs, [Ch][MeSO3] displayed a strong acidity, good thermal stability, and excellent lignin solubility. Under the reaction conditions of the mass ratio of [Ch][MeSO3] to Pd/C being 1, the Pd/C loading of 3.5 wt %, H2 pressure of 2.0 MPa, reaction time of 5 h, and temperature of 200 °C, the conversion of Kraft lignin and the selectivity to phenol (PL) and catechol (COL) reached 20.3%, 18.4%, and 18.1%, respectively. In order to rationalize the formation of PL and COL in our [Ch][MeSO3]-Pd/C system, the hydrogenolysis of a suitable lignin model compound (guaiacylglycerol-β-guaiacyl ether) was studied under the same condition for Kraft lignin. The results suggested that the mechanism involved fragmentation of lignin catalyzed by both acid and Pd/C, followed by acid-catalyzed C–O and C–C cleavage of the f...
Sign-in/Register to access full text options 
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.
