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Mechanistic and kinetic investigation on maximizing the formation of levoglucosan from cellulose during biomass pyrolysis

Shaw, Alexander, Zhang, Xiaolei, Kabalan, Lara and Li, Jun 2021. Mechanistic and kinetic investigation on maximizing the formation of levoglucosan from cellulose during biomass pyrolysis. Fuel 286 (P2) , 119444. 10.1016/j.fuel.2020.119444

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Abstract

Attempts to understand and control the formation of levoglucosan, as a key bio-oil compound and an important intermediate chemical, during biomass pyrolysis have recently generated a large number of experimental and computational studies. Whilst promising mechanisms have been put forward to explain levoglucosan formation, there has yet to be clarity on the factors that inhibit the stoichiometric yields from cellulose, and, current available mechanisms adopt model compounds of short chain oligosaccharide structures rather than cellulose polymer. In this work, kinetic models describing cellulose (with Degree of Polymerisation DP of 2048) decomposition and levoglucosan formation have been constructed. It was found that temperature and residence time co-ordinately influenced the yield of levoglucosan, i.e. maximum yield can be reached within 80 s at 600 °C, however, around 10 min is required at 550 °C. Anhydro-oligosaccharides greater than DP8 will be generated and then consumed in 60 s with pyrolysis temperatures of 500 °C and over. The results also showed that the current available concerted initiation and depropagation reactions are insufficient to explain the experimentally observed high rates of cellulose depolymerisation and levoglucosan formation, other key factors such as side reactions have to be considered. Additionally, it was found that the rate of levoglucosan generation is independent of the initial cellulose chain length, which is a finding that will facilitate future studies in the area of bioenergy and biomass decomposition.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Chemistry
Cardiff Catalysis Institute (CCI)
Publisher: Elsevier
ISSN: 0016-2361
Date of Acceptance: 6 October 2020
Last Modified: 03 Mar 2021 11:00
URI: http://orca.cardiff.ac.uk/id/eprint/139195

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