Selective Catalysis of Microcrystalline Cellulose for the Preparation of Glucose by Carbon-based Solid Acid Synergetic Molten Salt Hydrates
A carbon-based solid acid catalyst was prepared using waste wet tissue as carbon carrier by carbonation-sulfonation method.The effects of different activators and calcination temperatures on the acidity sites and pore structure of the prepared catalysts were investigated,and the catalysts performance was characterized by SEM,FT-IR,XRD,TG,etc.The catalytic performance of the synergistic molten salt hydrate for selective hydrolysis of microcrystalline cellulose to glucose was also investigated.The results showed that the catalyst(CSF-SO3H-K-500)with KOH as activator and calcination temperature of 500℃had more acidic sites and larger mesoporous structure,which was conducive to catalyzing cellulose hydrolysis to produce glucose.In the LiBr·3H2O reaction system,when the amount of catalyst CSF-SO3H-K-500 was 12.5％,the yield of glucose could reach 75.89％at 140 ℃ for 255 min,while the yield of 5-HMF was only 4.42％.Moreover,a high yield of glucose(73.41％)and a low yield of 5-HMF(5.33％)could be achieved in a relatively short time when the reaction was carried out at 150 ℃ for 2 h.In addition,the recovered catalyst still had certain activity after 6 times of use,where the cellulose conversion rate was 89.7％ and the glucose yield was 35.9％.
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