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Low-temperature selective catalytic dehydrogenation of methylcyclohexane by surface protonics
Kent Takise1, Ayaka Sato1, Shuhei Ogo1
1Waseda University, Department of Applied Chemistry 3-4-1, Okubo, Shinjuku Tokyo 169-8555 Japan ysekine@waseda.jp.
Applying an electric field to a Pt/TiO2 catalyst enables low-temperature methylcyclohexane (MCH) dehydrogenation for hydrogen storage. This method enhances selectivity and reduces byproduct formation, improving the MCH-toluene cycle efficiency.
Area of Science:
- Catalysis
- Hydrogen Storage
- Materials Science
Background:
- The methylcyclohexane (MCH)-toluene cycle is a key liquid organic hydride system for hydrogen storage.
- MCH dehydrogenation typically requires high temperatures (>623 K) over Pt-supported catalysts due to its endothermic nature.
Purpose of the Study:
- To investigate the effect of an electric field on Pt/TiO2 catalyst performance for MCH dehydrogenation.
- To achieve efficient MCH dehydrogenation at lower temperatures and improve selectivity.
Main Methods:
- Application of an electric field to a Pt/TiO2 catalyst during MCH dehydrogenation.
- Analysis of reaction products and byproducts.
- Characterization using DRIFTS and XPS to understand surface interactions.
Main Results:
- Selective MCH dehydrogenation was achieved at 423 K with electric field application, exceeding thermodynamic equilibrium.
- An inverse kinetic isotope effect (KIE) was observed, indicating accelerated proton collision.
- The Pt/TiO2 catalyst demonstrated no methane byproduct and reduced coke formation.
Conclusions:
- Electric field application significantly enhances MCH dehydrogenation over Pt/TiO2 at low temperatures.
- The electron donation from TiO2 to Pt weakens toluene-surface interaction, suppressing byproduct formation.
- This approach offers a more efficient and selective method for hydrogen release in MCH-based systems.
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