Hydrolysis and glycosidation of sugars during the esterification of fast pyrolysis bio-oil
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Acid-catalysed esterification converts organic acids in bio-oil into useful esters. However, the conditions to carry out esterification also promote the hydrolysis of anhydro-sugars in bio-oil. This paper reports the hydrolysis and glycosidation of sugars during the esterification of bio-oil using Amberlyst-70 solid acid catalyst at 70–170 _C. The bio-oil was prepared from the fast pyrolysis of mallee biomass in a fluidised- bed reactor. Our results show that sugar oligomers and levoglucosan in bio-oil can be hydrolysed to form D-glucose, which further reacts with methanol to form methyl-a-D-glucopyranoside, concurrently with the esterification of acids (e.g. formic, acetic and propionic acids) in bio-oil. The effects of other important parameters such as catalyst loading and methanol to bio-oil ratio on the hydrolysis-glycosidation of sugar compounds present in bio-oil are also reported.
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Yu, Yun; Chua, Yee Wen; Wu, Hongwei (2016)This study characterizes the pyrolytic sugars in three bio-oils (with a total sugar content range of 55.6–69.2 mg g–1 bio-oil) produced from biomass fast pyrolysis by high performance anion exchange chromatography with ...
Wu, L.; Hu, X.; Wang, S.; Mourant, D.; Song, Y.; Li, T.; Li, Chun-Zhu (2016)Coke formation during the esterification of bio-oil in alcohols and water over a solid acid catalyst Amberlyst 70 has been investigated. The amounts of coke formed from the acid-treatment of bio-oil in various alcohols ...
Acid-treatment of bio-oil in methanol: The distinct catalytic behaviours of a mineral acid catalyst and a solid acid catalystWu, L.; Hu, X.; Wang, Shuai; Mahmudul Hasan, M.; Jiang, S.; Li, T.; Li, C. (2018)© 2017 Elsevier Ltd The different catalytic behaviour of solid acid catalyst and mineral acid catalyst towards the acid-treatment of bio-oil was investigated. The hydrogen ions in the mineral acid catalyst such as sulfuric ...