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2019, Volume 13, Issue 4

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Frontiers of Chemical Science and Engineering >> 2019, Volume 13, Issue 4 doi: 10.1007/s11705-019-1804-5

Microwave-assisted catalyst-free hydrolysis of fibrous cellulose for deriving sugars and biochemicals

. School of Chemical Engineering and Analytical Science, The University of Manchester, Manchester M13 9PL, UK.. School of Chemistry and Chemical Engineering, Chongqing University of Science and Technology, Chongqing 401331, China.. School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China

Accepted: 2019-04-08 Available online: 2019-04-08
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Abstract

Microwave (MW) assisted catalyst-free hydrolysis of fibrous cellulose (FC, cellulolysis) at 200°C promoted a cellulose conversion of ca 37.2% and quantitative production of valuable C5/C6 sugars (e.g , glucose) and the according platform biochemicals (e.g , 5-hydroxymethylfurfural), corresponding to an overall selectivity of 96.5%. Conversely, conventional hydrothermal cellulolysis under similar conditions was not effective, even after 24 h, carbonising the FC. Based on the systematic study of MW-assisted cellulolysis, the specific interaction between water molecules and macroscopic FC under the MW irradiation was proposed, accounting for the interpretation of the experimental observation. The kinetic energy of water molecules under the MW irradiation facilitated the C C (in the non-hindered surface CH OH groups) and C O C bond breaking (inside the cellulose cavities) in FC, producing primary cellulolysis products of xylose, glucose and cellobiose.

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