Hydrolysis of mechanically pre-treated cellulose catalyzed by solid acid SO42−-TiO2 in water–ethanol solvent

Publication date: Available online 20 March 2019Source: Chinese Journal of Chemical EngineeringAuthor(s): Xingyilong Zhang, Houfang Lu, Kejing Wu, Yingying Liu, Changjun Liu, Yingming Zhu, Bin LiangAbstractAn efficient catalyst SO42−-TiO2 (ST) from industrial metatitanic acid has been successfully prepared to catalyze hydrolysis of ball-milling cellulose. The results show that the highest catalytic efficiency is obtained for ST calcined at 450 °C (ST-450) with the yield of 21.8% glucose, 13.0% 5-HMF and 4.2% furfural at 200 °C for 30 min. The ball milling of cellulose and solid acid catalyst significantly enhances the cellulose hydrolysis. The high Lewis to Brönsted acid sites ratio for ST-450 induced by bidentate ligands between SO42− and TiO2 benefits high organics yield, and high total acid sites contribute to the high cellulose conversion. The large pore volume of 0.29 cm3·g−1 and appropriate pore size of 7.35 nm of ST-450 also contribute to the high performance. High reaction temperature over 200 °C exhibits negative effect on glucose and 5-HMF yield due to undesired side reactions, while furfural product is stable in the reaction system. The bidentate ligands between SO42− and TiO2 are considered as active acid sites for cellulose hydrolysis in water–ethanol solvents.

Source: Chinese Journal of Chemical Engineering - May 19, 2019 Category: Chemistry Source Type: research