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Comparison between liquid and solid acids catalysts on reducing sugars conversion from furfural residues via pretreatments
- Lin, Keying, Ma, Baojun, Sun, Yuan, Liu, Wanyi
- Bioresource technology 2014 v.167 pp. 133-136
- catalysts, coal, environmental factors, furfural, hydrolysis, reducing sugars, sodium hydroxide, sulfuric acid, temperature, ultrasonics
- Liquid sulphuric acid is adopted and compared with carbon-based sulfonated solid acids (coal tar-based and active carbon-based) for furfural residues conversion into reducing sugars. The optimum hydrolysis conditions of liquid acid are at 4% of sulphuric acid, 25:1 of liquid and solid ratio, 175°C of reaction temperature and 120min of reaction time. The reducing sugar yields are reached over 60% on liquid acid via NaOH/H2O2, NaOH/microwave and NaOH/ultrasonic pretreatments, whereas only over 30% on solid acids. The TOFs (turnover number frequency) via NaOH/H2O2 pretreatments are 0.093, 0.020 and 0.023h−1 for liquid sulphuric acid, coal tar-based and active carbon-based solid acids catalysts, respectively. Considering the efficiency, cost and environment factors, the liquid and solid acids have their own advantages of potential commercial application values.