N2O Hydrogenation on Silver Doped Gold Catalysts, a DFT Study
José L C Fajín1, Maria Natália D S Cordeiro1
1LAQV@REQUIMTE, Department of Chemistry and Biochemistry, Faculty of Sciences, University of Porto, P-4169-007 Porto, Portugal.
Silver doping on Au(210) surfaces facilitates N2O hydrogenation. N2O dissociation is the rate-limiting step, while good silver dispersion prevents catalyst poisoning by oxygen adatoms.
Area of Science:
- Surface Science
- Catalysis
- Computational Chemistry
Background:
- Understanding catalytic mechanisms is crucial for designing efficient catalysts.
- Silver-doped gold surfaces are promising for N2O hydrogenation.
Purpose of the Study:
- Investigate the reaction mechanism of N2O hydrogenation on Ag-doped Au(210).
- Clarify experimental observations through theoretical calculations.
Main Methods:
- Density Functional Theory (DFT) calculations.
- Determination of activation energy barriers, rate constants, and reaction energies.
- Elucidation of the most favorable reaction pathways.
Main Results:
- N2O dissociation occurs on silver-rich regions; H2 dissociation occurs on gold-rich regions.
- N2O dissociation is the rate-determining step.
- Water formation occurs at the interface of N2O and H2 dissociation sites.
Conclusions:
- A detailed reaction mechanism for N2O hydrogenation on Ag-doped Au(210) was elucidated.
- Optimal silver dispersion is essential to prevent catalyst poisoning by adsorbed oxygen.
- The study provides insights into optimizing silver-gold catalysts for N2O hydrogenation.
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