Acid-catalyzed conversion of mono- and poly-sugars into platform chemicals: Effects of molecular structure of sugar substrate

作者：Hu Xun; Wu Liping; Wang Yi; Song Yao; Mourant Daniel; Gunawan Richard; Gholizadeh Mortaza; Li Chun Zhu^*

来源：Bioresource Technology, 2013, 133: 469-474.

DOI：10.1016/j.biortech.2013.01.080

• Carbohydrates
• Molecular structures
• Acid-catalyzed conversion
• Platform chemicals
• Polymerization

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 %26gt; glucose %26gt; 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, beta-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.

• 出版日期2013-4