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Beyond a solvent: the roles of 1-butyl-3-methylimidazolium chloride in the acid-catalysis for cellulose depolymerisation

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Nunes de Oliveira,  Heitor Fernando
Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Farès,  Christophe
Service Department Farès (NMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society;

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Rinaldi,  Roberto
Research Group Rinaldi, Max-Planck-Institut für Kohlenforschung, Max Planck Society;
Imperial College London, Department of Chemical Engineering, South Kensington Campus, SW7 AZ2 London, UK ;

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Citation

Nunes de Oliveira, H. F., Farès, C., & Rinaldi, R. (2015). Beyond a solvent: the roles of 1-butyl-3-methylimidazolium chloride in the acid-catalysis for cellulose depolymerisation. Chemical Science, 6(9), 5215-5224. doi:10.1039/C5SC00393H.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0029-6E43-A
Abstract
In this report, 1-butyl-3-methylimidazolium chloride ([C4C1im]Cl) is demonstrated to enhance the kinetics of acid-catalysed hydrolysis of 1,4-β-glucans in binary solvent mixtures. [C4C1im]Cl plays other roles in the reaction beyond acting as a solvent for cellulose, as currently accepted. In fact, the presence of the IL increases the Hammett acidity of the catalyst dissolved in the reaction medium. The kinetic data from cellobiose and cellulose hydrolysis directly correlate with the acid strength found for p-toluenesulfonic acid in the different reaction media studied here. The current report identifies neglected, but yet very important phenomena occurring in cellulose depolymerisation.