Please use this identifier to cite or link to this item: https://doi.org/10.1016/j.jaap.2013.07.010
Title: Influence of selected mineral acids and alkalis on cellulose pyrolysis pathways and anhydrosaccharide formation
Authors: Shaik, S.M.
Sharratt, P.N.
Tan, R.B.H. 
Keywords: Biomass
Cellulose
Levoglucosan
Levoglucosenone
Pyrolysis
Transglycosylation
Issue Date: Nov-2013
Source: Shaik, S.M., Sharratt, P.N., Tan, R.B.H. (2013-11). Influence of selected mineral acids and alkalis on cellulose pyrolysis pathways and anhydrosaccharide formation. Journal of Analytical and Applied Pyrolysis 104 : 234-242. ScholarBank@NUS Repository. https://doi.org/10.1016/j.jaap.2013.07.010
Abstract: The primary/initial thermal degradation pathway is via intermolecular transglycosylation reactions within the glucose monomers of cellulose. Formation of liquid tar from cellulose can also occur via β-elimination. Under this mechanism, volatile acids (e.g. carboxylic acids) formed from the initial cellulose decomposition are able to attack the remaining cellulose as Bronsted acids thus catalysing heterolytic (ring-opening) reactions. Here, we have studied the effects of acids (H2SO4, H3PO 4, H3BO3) and alkalis (Ca(OH)2, NH4OH) on the yields of levoglucosan and its derivatives (levoglucosenone, 1,4:3,6-dianhydro-α-d-glucopyranose, 1,6-anhydro-β-d-glucofuranose). It was found that the acids generally decreased the total amount of anhydrosaccharides whilst cellulose infused with the alkalis had increased anhydrosaccharide yields. The results indicate that the β-elimination pathway was catalysed by the presence of acidic species (e.g. H+ ions). The extent of cellulose conversion via the β-elimination pathway was dependant on the amount and strength of acid infused within the cellulose matrix. However, the β-elimination route could also be suppressed or controlled by the introduction of a neutralising species (e.g. OH- ions). © 2013 Elsevier B.V. All rights reserved.
Source Title: Journal of Analytical and Applied Pyrolysis
URI: http://scholarbank.nus.edu.sg/handle/10635/89232
ISSN: 01652370
DOI: 10.1016/j.jaap.2013.07.010
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