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Comparison between liquid and solid acids catalysts on reducing sugars conversion from furfural residues via
Keying Lin1, Baojun Ma1, Yuan Sun1
1State Key Laboratory Cultivation Base of Natural Gas Conversion, College of Chemistry, Ningxia University, Yinchuan 750021, China.
Bioresource Technology
|July 1, 2014
Summary
Liquid sulfuric acid effectively converts furfural residues to reducing sugars, yielding over 60%. Solid acids show lower yields, but both acid types offer commercial potential.
Area of Science:
- Biomass Conversion
- Catalysis
- Green Chemistry
Background:
- Furfural residues are abundant lignocellulosic byproducts.
- Efficient conversion to valuable products like reducing sugars is crucial.
- Sulfonated solid acids and liquid sulfuric acid are potential catalysts.
Purpose of the Study:
- To compare liquid sulfuric acid with carbon-based solid acids for furfural residue conversion.
- To optimize hydrolysis conditions for liquid sulfuric acid.
- To evaluate catalyst efficiency and potential applications.
Main Methods:
- Hydrolysis of furfural residues using liquid sulfuric acid and solid acids (coal tar-based, active carbon-based).
- Optimization of reaction parameters: acid concentration, liquid-to-solid ratio, temperature, and time.
- Pretreatment methods: NaOH/H2O2, NaOH/microwave, and NaOH/ultrasonic.
- Analysis of reducing sugar yields and turnover number frequency (TOF).
Main Results:
- Optimal liquid sulfuric acid hydrolysis: 4% acid, 25:1 ratio, 175°C, 120 min.
- Reducing sugar yields >60% with liquid acid (vs. >30% with solid acids) after NaOH/H2O2 pretreatment.
- TOF values: 0.093 h⁻¹ (liquid H2SO4), 0.020 h⁻¹ (coal tar-based), 0.023 h⁻¹ (active carbon-based).
Conclusions:
- Liquid sulfuric acid demonstrates superior performance in converting furfural residues to reducing sugars.
- Both liquid and solid acids possess distinct advantages for potential commercial applications.
- Further research may focus on optimizing solid acid catalysts or process integration.
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