Journal article
Sn-Beta catalysed conversion of hemicellulosic sugars
Conversions of various pentoses and hexoses into methyl lactate has been demonstrated for the Sn-Beta catalyst. It is found that pentoses are converted to methyl lactate in slightly lower yields (∼40%) than what is obtained for hexoses (∼50%), but higher yields of glycolaldehyde dimethyl acetal are observed for the pentoses.
This finding is in accordance to a reaction pathway that involves the retro aldol condensation of the sugars to form a triose and glycolaldehyde for the pentoses, and two trioses for hexoses. When reacting glycolaldehyde (formally a C2-sugar) in the presence of Sn-Beta, aldol condensation occurs, leading to the formation of methyl lactate, methyl vinylglycolate and methyl 2-hydroxy-4-methoxybutanoate.
In contrast, when converting the sugars in water at low temperatures (100 °C), Sn-Beta catalyses the isomerisation of sugars (ketose–aldose epimers), rather than the formation of lactates.
Language: | English |
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Publisher: | The Royal Society of Chemistry |
Year: | 2012 |
Pages: | 702-706 |
ISSN: | 14639270 and 14639262 |
Types: | Journal article |
DOI: | 10.1039/c2gc16202d |
ORCIDs: | Riisager, Anders |