Direct propylene epoxidation via water activation over Pd-Pt electrocatalysts

Area of Science:

• Electrochemistry
• Catalysis
• Sustainable Chemistry

Background:

• Traditional propylene epoxidation uses hazardous reagents like chlorine or peroxides.
• Developing sustainable and efficient catalytic methods is crucial for green chemistry.

Purpose of the Study:

• To develop a direct electrochemical method for propylene epoxidation using water-oxidation intermediates.
• To investigate the performance of a novel oxidized palladium-platinum alloy catalyst (PdPtO/C).

Main Methods:

• Electrochemical synthesis and characterization of PdPtO/C catalyst.
• Electrochemical propylene epoxidation experiments at ambient conditions.
• Kinetic analysis to elucidate reaction mechanisms.

Main Results:

• The PdPtO/C catalyst achieved a 66 ± 5% Faradaic efficiency for propylene epoxidation.
• High performance was observed at 50 mA/cm² under ambient temperature and pressure.
• Embedding platinum stabilized oxidized platinum species, enhancing catalyst performance.

Conclusions:

• Direct electrochemical propylene epoxidation using water-oxidation intermediates is a viable sustainable alternative.
• The PdPtO/C catalyst demonstrates effective oxygen-atom transfer from water without mediators.
• This strategy holds promise for various electrochemical oxygenation reactions.