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Ruthenium and Platinum-Modified Titanium Dioxide Support for NaBH4 Hydrolysis
Cigdem Tuc Altaf1, Valentina G Minkina2, Stanislav I Shabunya2
1Micro and Nanotechnology Graduate Program, TOBB University of Economics and Technology, Sogutozu Caddesi no. 43, Sogutozu 06560, Ankara, Turkey.
Highly stable platinum and ruthenium catalysts on titanium dioxide nanoparticles efficiently generate hydrogen from sodium borohydride hydrolysis, achieving 95% productivity. Catalyst performance varied with solution alkalinity and sodium hydroxide concentration.
Area of Science:
- Materials Science
- Catalysis
- Chemical Engineering
Background:
- Hydrogen generation is crucial for clean energy. Sodium borohydride hydrolysis offers a promising route.
- Developing efficient and stable catalysts is key for practical hydrogen production.
Purpose of the Study:
- To prepare and characterize platinum (Pt) and ruthenium (Ru)-based catalysts supported on titanium dioxide (TiO2) nanoparticles.
- To investigate the hydrogen generation rate (HGR) and activation energy of sodium borohydride (NaBH4) hydrolysis using these catalysts.
- To evaluate the effect of alkaline conditions and NaOH concentration on catalyst performance.
Main Methods:
- Synthesis of Pt/TiO2 and Ru/TiO2 nanoparticle catalysts.
- Hydrogen generation experiments using NaBH4 hydrolysis.
- Kinetic analysis including activation energy determination.
- Systematic variation of NaOH concentration (0.5-2 M) to study its impact on HGR.
Main Results:
- High hydrogen generation productivity (up to 95%) was achieved with the prepared catalysts.
- Ru/TiO2 catalysts showed activation energies of 62.00 kJ mol-1 (aqueous) and 64.65 kJ mol-1 (alkaline).
- Pt/TiO2 catalysts exhibited a decrease in activation energy from 60.5 kJ mol-1 (aqueous) to 53.2 kJ mol-1 (alkaline).
- HGR with Ru/TiO2 decreased as NaOH concentration increased.
- HGR with Pt/TiO2 increased with increasing NaOH concentration.
Conclusions:
- Pt/TiO2 and Ru/TiO2 catalysts demonstrate high efficiency for hydrogen generation from NaBH4 hydrolysis.
- Catalyst performance is significantly influenced by solution pH and NaOH concentration.
- Pt/TiO2 shows enhanced activity in alkaline media with increasing NaOH concentration, while Ru/TiO2 performance degrades.
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