Abstract
Aromatic sulfonic acid, p-toluenesulfonic acid (p-TsOH), was employed to pretreat the corn stover in aqueous for improving the enzymatic hydrolysis of cellulose-enriched residue, and was compared to ethanol/water pretreatment. The glucose yield of corn stover from p-TsOH/water pretreatment (97.6 %) was higher than that from ethanol/water pretreatment (89.5 %) after 96 h hydrolysis with high cellulase loading of 15 FPU/g-cellulose. More than 80 % of glucose yield was still obtained with low cellulase loading (7.5 FPU/g-cellulose) after p-TsOH/water pretreatment, while only 65.2 % was obtained after ethanol/water pretreatment. Composition and structure analysis showed that p-TsOH/water pretreatment severely break the fibre, removed more lignin (especially of surface lignin), well increased cellulose accessibility, and resulted in more hydroxyl exposed on the surface. Moreover, more monomeric sugars (xylose and glucose) derived from hemicellulose were released after p-TsOH/water pretreatment, and they could be converted to valuable platform chemical of levulinic acid by simply heating the prehydrolysate.
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