Catalytic depolymerisation of isolated lignin to fine chemicals: part 2 – process optimisation

McVeigh, A., Bouxin, F. P., Jarvis, M. C. and Jackson, S. (2016) Catalytic depolymerisation of isolated lignin to fine chemicals: part 2 – process optimisation. Catalysis Science and Technology, 6(12), pp. 4142-4150. (doi:10.1039/C5CY01896J)

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Abstract

The depolymerisation of an ammonia treated lignin to alkylphenols over a Pt/alumina catalyst was investigated under a range of process parameters including, pressure, mass of lignin, solvent and gas atmosphere. The depolymerisation was shown to be under kinetic control and orders of reaction in hydrogen and lignin were determined as 0.4 and 0 respectively. Hydrogen was shown to be necessary under our reaction conditions as when helium was used as the gas atmosphere poor conversion was obtained. A clear solvent effect was observed with 100% methanol being more effective than 100% water or any combination of the two with a yield of alkylphenols >40% with a selectivity of >40% to substituted 4-propyl-2,6-dimethoxyphenol compounds. This high yield using methanol as a solvent was thought to be due to the ability of the methanol to inhibit re-polymerisation. IPA/water was also found to be an effective solvent combination with a yield of alkylphenols of >20%. The depolymerisation reaction was also studied over Rh/alumina and Ir/alumina catalysts. The rhodium catalyst was found to be the most active on a weight basis being slightly more active than platinum, however on a molar basis the platinum was much more active.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Jackson, Professor Samuel and Jarvis, Dr Michael and Bouxin, Dr Florent
Authors: McVeigh, A., Bouxin, F. P., Jarvis, M. C., and Jackson, S.
College/School:College of Science and Engineering > School of Chemistry
Journal Name:Catalysis Science and Technology
Publisher:Royal Society of Chemistry
ISSN:2044-4753
ISSN (Online):2044-4761
Published Online:28 January 2016
Copyright Holders:Copyright © 2016 The Royal Society of Chemistry
First Published:First published in Catalysis Science and Technology 6(12): 4142-4150
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
534161Fine chemicals from lignocellulosic fermentation residues using heterogeneous catalysisMichael JarvisBiotechnology and Biological Sciences Research Council (BBSRC)BB/I005528/1CHEM - CHEMISTRY
592411Integrated Biorefining Research and Technology Club -University of GlasgowSamuel JacksonBiotechnology and Biological Sciences Research Council (BBSRC)BB/J500823/1CHEM - CHEMISTRY