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Electrocatalytic Oxidation of HMF to FDCA over Multivalent Ruthenium in Neutral Electrolyte
Shiying Yang1, Xin Jin1, Bin Zhu2
1Institute of Advanced Synthesis, School of Chemistry and Molecular Engineering, Jiangsu National Synergetic Innovation Centre for Advanced Materials, Nanjing Tech University, Nanjing 211816, China.
Molecules (Basel, Switzerland)
|May 7, 2025
Summary
Ruthenium catalysts on carbon nanotubes efficiently convert biomass-derived 5-hydroxymethylfurfural (HMF) to 2,5-furandicarboxylic acid (FDCA). The Ru+2.9 catalyst achieved a 90.2% FDCA yield in neutral conditions, offering a cost-effective green chemistry approach.
Area of Science:
- Green Chemistry and Sustainable Catalysis
- Biomass Conversion and Renewable Energy
Background:
- 5-Hydroxymethylfurfural (HMF) is a key biomass-derived platform chemical.
- 2,5-Furandicarboxylic acid (FDCA) is a sustainable alternative to petroleum-based terephthalic acid (TPA) for polymer synthesis.
- Efficient and cost-effective methods for HMF oxidation are crucial for a circular economy.
Purpose of the Study:
- To synthesize and evaluate ruthenium-based catalysts supported on carbon nanotubes (CNTs) for HMF electrooxidation.
- To identify the optimal ruthenium valence state for high-yield FDCA production.
- To develop a cost-effective and environmentally friendly process for FDCA synthesis.
Main Methods:
- Synthesis of four ruthenium catalysts with varying valence states supported on CNTs.
- Electrochemical oxidation of HMF in a neutral medium (0.1 M K2SO4).
- Performance comparison of catalysts, including FDCA yield and applied potential.
- Mechanistic analysis focusing on catalyst specific capacitance.
Main Results:
- The Ru+2.9 catalyst exhibited the highest activity for HMF electrooxidation.
- A maximum FDCA yield of 90.2% was achieved at 0.95 V (vs. Ag/AgCl) after 24 hours.
- Superior specific capacitance of the Ru+2.9 catalyst was identified as a key factor for enhanced activity.
- The process avoids excessive alkaline additives and allows for easy FDCA separation.
Conclusions:
- Ruthenium catalysts supported on CNTs are effective for HMF electrooxidation to FDCA.
- The Ru+2.9 catalyst offers a promising, cost-effective route for sustainable FDCA production.
- This method simplifies catalyst preparation and product separation, aligning with green chemistry principles.
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