Intermetallic NaAu2 as a heterogeneous catalyst for low-temperature CO oxidation

Area of Science:

• Materials Science
• Catalysis
• Surface Chemistry

Background:

• Intermetallic compounds offer enhanced stability and unique electronic properties for catalysis.
• Developing efficient catalysts for carbon monoxide (CO) oxidation is crucial for various chemical processes.

Purpose of the Study:

• To investigate the catalytic activity of intermetallic NaAu2 for CO oxidation at low temperatures.
• To elucidate the reaction mechanism and identify key factors contributing to its catalytic performance.

Main Methods:

• Density functional theory (DFT) calculations were employed to model the reaction.
• Analysis of reaction pathways, intermediates, and transition states.

Main Results:

• Intermetallic NaAu2 demonstrates significant activity for CO oxidation under low-temperature conditions.
• A reaction mechanism was proposed involving the direct reaction of CO with adsorbed O2 to form an OOCO* intermediate.
• Surface sodium (Na) was found to enhance O2 binding and lower transition state energy barriers.

Conclusions:

• Intermetallic NaAu2 is a promising catalyst for low-temperature CO oxidation.
• The presence of Na on the surface plays a critical role in facilitating the reaction by modifying electronic properties and lowering activation barriers.