Integrated Experimental-Theoretical Approach To Determine Reliable Molecular Reaction Mechanisms on Transition-Metal...

Area of Science:

• Surface Science
• Materials Chemistry
• Computational Chemistry

Background:

• Understanding gas-surface interactions on metal oxides is crucial for catalysis.
• Accurate theoretical modeling of surface chemistry is challenging, especially for correlated materials.
• Over-binding of molecules can lead to inaccurate predictions in surface reaction modeling.

Purpose of the Study:

• To quantitatively correlate molecular desorption temperature and binding energy on d and f metal oxide surfaces.
• To demonstrate the utility of temperature-programmed desorption (TPD) for quantitatively linking theoretical surface chemistry (using on-site Hubbard U correction) to gas-surface interactions.
• To address and provide solutions for over-binding issues in surface reaction modeling of various molecules.

Main Methods:

• Combining experimental techniques, specifically temperature-programmed desorption (TPD).
• Employing theoretical approaches, including density functional theory (DFT) with on-site Hubbard U correction.
• Investigating CO and NO oxidation mechanisms on perovskite and mullite-type oxides.

Main Results:

• Established a quantitative relationship between molecular desorption temperature and binding energy on metal oxide surfaces.
• Successfully correlated theoretical surface chemistry with gas-surface interactions for catalytic reactions using TPD.
• Developed solutions for over-binding issues concerning molecules like CO, NO, and SO.

Conclusions:

• TPD and DFT are highly reliable when used together to generate accurate surface chemistry information.
• This approach is applicable to a wide range of correlated metal oxide materials.
• The findings advance the understanding and modeling of catalytic reactions on metal oxide surfaces.