title: Acid-catalyzed conversion of mono- and poly-sugars into platform chemicals: effects of molecular structure of sugar substrate.
abstract: Hydrolysis/pyrolysis of lignocellulosic biomass always produces a mixture of sugars with distinct structures as intermediates or products. This study tried to elucidate the effects of molecular structure of sugars on their acid-catalyzed conversions in ethanol/water. Location of carbonyl group in sugars (fructose versus glucose) and steric configuration of hydroxyl groups (glucose versus galactose) significantly affected yields of levulinic acid/ester (fructose>glucose>galactose). The dehydration of fructose to 5-(hydroxymethyl)furfural produces much less soluble polymer than that from glucose and galactose, which results in high yields of levulinic acid/ester from fructose. Anhydrate sugar such as levoglucosan tends to undergo the undesirable decomposition to form less levulinic acid/ester. Catalytic behaviors of the poly-sugars (sucrose, maltose, raffinose, β-cyclodextrins) were determined much by their basic units. However, their big molecular sizes create the steric hindrance that significantly affects their followed conversion over solid acid catalyst.
authors: Fuels and Energy Technology Institute, Curtin University of Technology, Perth, WA 6845, Australia.
authors: Xun
authors: X
authors: Hu
authors: Liping
authors: L
authors: Wu
authors: Yi
authors: Y
authors: Wang
authors: Yao
authors: Y
authors: Song
authors: Daniel
authors: D
authors: Mourant
authors: Richard
authors: R
authors: Gunawan
authors: Mortaza
authors: M
authors: Gholizadeh
authors: Chun-Zhu
authors: CZ
authors: Li
mesh_terms: D000143:Acids / Q000494:pharmacology*; D001704:Biopolymers; D050260:Carbohydrate Metabolism / Q000187:drug effects*; D002241:Carbohydrates / Q000737:chemistry*; D002384:Catalysis / Q000187:drug effects; D007982:Levulinic Acids / Q000378:metabolism; D011134:Polysaccharides / Q000737:chemistry; D012995:Solubility
chemical_list: D000143:Acids; D001704:Biopolymers; D002241:Carbohydrates; D007982:Levulinic Acids; D011134:Polysaccharides; C542586:ethyl levulinate; C032246:levulinic acid