One-pot synthesis of a chemically functional magnetic carbonaceous acid catalyst for fermentable sugars production from sugarcane bagasse

• Published in: Fuel (Guildford) 2020-02, Vol.262, p.116512, Article 116512
• Main Authors: Su, Tongchao, Zeng, Jie, Gao, Haiyan, Jiang, Liqun, Bai, Xiuzhi, Zhou, Haixu, Xu, Feixiang
• Format: Article
• Language: English
• Subjects: Acidity; Bagasse; Catalysts; Catalytic converters; Chemical synthesis; Glucose; Hydrolysis; Iron oxides; Magnetic carbonaceous acid; Magnetic fields; Magnetism; Organic chemistry; Sodium hydroxide; Sugar; Sugarcane; Sugarcane bagasse; Sulfonation; Sulfonic acid; Yield
• ISSN: 0016-2361; 1873-7153
• DOI: 10.1016/j.fuel.2019.116512

A magnetic carbonaceous acid was synthesized for the hydrolysis of FPB under microwave. The catalyst can be recycled for five times with yield of 54.47% for glucose with little deactivation and magnetism loss. [Display omitted] Magnetic carbonaceous acid catalyst was synthesized from nano-Fe3O4 powder, glucose and hydroxyethyl-sulfonic acid by a novel method of one-pot hydrothermal precipitation-sulfonation. It was found that the prepared C-SO3H@Fe3O4/C catalyst had high acidity (1.23 mmol g−1) and strong magnetism (12.85 Am2/kg). High yields of glucose (62.59%) and total reducing sugar (73.01%) were achieved from NaOH-freeze pretreated sugarcane bagasse by the C-SO3H@Fe3O4/C catalyst at 180 °C in a microwave reactor. In addition, the C-SO3H@Fe3O4/C catalyst could be easily separated and recovered by an external magnetic force at a high recovery rate (93.18%). High yields of glucose (54.47%) and total reducing sugar (60.65%) were also obtained after experiencing five-time cycles. It was demonstrated as an effective hydrolysis of pretreated sugarcane bagasse to fermentable sugars with high yields by the assistance of the C-SO3H@Fe3O4/C catalyst, and the catalyst exhibited an excellent catalytic stability during the conversion process.