Single-atom catalysis of CO oxidation using Pt1/FeOx.

Area of Science:

• Materials Science
• Catalysis
• Nanotechnology

Background:

• Platinum-based heterogeneous catalysts are vital for industrial chemical processes.
• Current catalysts suffer from low atom efficiency as only surface atoms are active.
• Developing single-atom catalysts is crucial for maximizing efficiency but presents synthesis challenges.

Purpose of the Study:

• To synthesize and characterize a novel single-atom catalyst with isolated platinum atoms on iron oxide nanocrystallites.
• To evaluate the catalytic activity, stability, and atom efficiency of the synthesized single-atom catalyst.
• To elucidate the electronic structure and its correlation with catalytic performance using theoretical calculations.

Main Methods:

• Synthesis of single platinum atoms anchored to iron oxide nanocrystallite surfaces.
• Characterization of the single-atom catalyst.
• Testing catalytic activity for CO oxidation and preferential CO oxidation in H2.
• Density Functional Theory (DFT) calculations to investigate electronic properties and reaction mechanisms.

Main Results:

• Successfully synthesized a single-atom catalyst comprising isolated Pt atoms on iron oxide.
• The catalyst demonstrated exceptionally high atom efficiency, stability, and activity in CO oxidation and preferential CO oxidation reactions.
• DFT calculations revealed that high catalytic activity is linked to positively charged, high-valent Pt atoms with partially vacant 5d orbitals.

Conclusions:

• The developed single-atom platinum catalyst offers a highly efficient and stable alternative for critical industrial reactions.
• The findings highlight the potential of single-atom catalysis for maximizing resource utilization in chemical processes.
• Understanding the electronic structure provides insights for designing next-generation high-performance catalysts.