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Carbon-Supported Potassium Hydride for Efficient Low-Temperature Desulfurization.
1Laboratory of Energy Science and Engineering, Department of Mechanical and Process Engineering, ETH Zürich, 8092, Zürich, Switzerland.
Chemistry (Weinheim an Der Bergstrasse, Germany)
|June 1, 2022
Summary
A novel carbon-supported potassium hydride (KH/C) catalyst efficiently removes organosulfur impurities from fossil fuels under mild conditions. This transition-metal-free material offers a promising alternative for cleaner fuel production.
Area of Science:
- Catalysis
- Materials Science
- Environmental Chemistry
Background:
- Industrial organosulfur removal from fossil fuels uses harsh conditions and struggles with refractory alkyl dibenzothiophenes (DBTs).
- Existing transition-metal catalysts are effective but require high temperatures and pressures.
Purpose of the Study:
- To develop an efficient and mild desulfurization (DS) method for refractory organosulfur compounds.
- To explore the catalytic capabilities of a transition-metal-free material for fuel purification.
Main Methods:
- Utilized carbon-supported potassium hydride (KH/C) as a catalyst for desulfurization.
- Conducted desulfurization reactions at 165°C with a 15% excess of KH per C-S bond.
Main Results:
- Achieved >97% conversion of DBTs to biphenyls with 84-95% yields at 165°C in 3-6 hours.
- Reduced 4,6-Me2 DBT concentration from 1000 ppm to <3 ppm.
- Demonstrated KH/C's ability to perform deoxygenation, denitrogenation, and aromatic hydrogenation.
Conclusions:
- KH/C enables efficient desulfurization of refractory organosulfur compounds under mild, transition-metal-free conditions.
- This catalyst shows potential for decentralized organosulfur removal from fossil fuels.
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