Cryogenic Carbon Monoxide Oxidation on Cuprous Oxide.

Area of Science:

• Surface Chemistry
• Sustainable Chemistry
• Materials Science

Background:

• Low-temperature oxidation reactions are vital for sustainable chemistry.
• Carbon monoxide (CO) oxidation is a key benchmark reaction for surface chemistry.
• Cryogenic CO oxidation typically requires metal nanoparticles on metal oxides.

Purpose of the Study:

• To investigate CO oxidation on earth-abundant metal oxides at cryogenic temperatures.
• To identify novel catalytic sites for low-temperature oxidation.
• To understand the reaction mechanism on Cu2O(111).

Main Methods:

• Experimental spectroscopy
• Computational calculations
• Surface science studies on Cu2O(111)

Main Results:

• CO oxidation to CO2 observed below 100 K on Cu2O(111).
• Identification of reactive oxygen atoms on the Cu2O(111) facet.
• Proposed low-barrier reaction pathway at reconstructed surface sites.

Conclusions:

• Earth-abundant Cu2O exhibits high reactivity for CO oxidation at cryogenic temperatures.
• Reconstructed Cu2O(111) surface sites facilitate efficient heterogeneous oxidation.
• This finding advances sustainable chemistry through low-temperature catalytic processes.