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Towards chemically accurate simulation of molecule-surface reactions
1Leiden Institute of Chemistry, Leiden University, Gorlaeus Laboratories, P.O. Box 9502, 2300 RA Leiden, The Netherlands. g.j.kroes@chem.leidenuniv.nl
Physical Chemistry Chemical Physics : PCCP
|October 6, 2012
Summary
Accurately predicting molecule-surface reactions is key for catalysis. This work explores methods like specific reaction parameter density functional theory (SRP-DFT) and Ab Initio Molecular Dynamics (AIMD) to overcome challenges in chemical accuracy.
Area of Science:
- Surface science
- Theoretical chemistry
- Computational materials science
Background:
- Heterogeneously catalyzed reactions are crucial for over 90% of man-made chemicals.
- Accurate prediction of molecule-metal surface interactions is essential for advancing chemical production.
- Dissociative chemisorption of molecules like H(2), N(2), and CH(4) on metal surfaces presents significant theoretical challenges.
Purpose of the Study:
- To address four key challenges in quantitatively predicting molecule-metal surface reactions.
- To propose and discuss methods for achieving chemical accuracy (errors < 1 kcal mol(-1)) in reaction barrier heights.
- To explore advanced computational techniques for improved descriptions of surface reaction dynamics.
Main Methods:
- Specific Reaction Parameter Density Functional Theory (SRP-DFT) for accurate interaction descriptions.
- Sudden approximations in quantum dynamics and Ab Initio Molecular Dynamics (AIMD) for phonon effects.
- Combining AIMD with electronic friction for electron-hole pair excitations.
- Multi-Configuration Time-Dependent Hartree (MCTDH) method for polyatomic molecule reactions.
Main Results:
- SRP-DFT shows promise for H(2) reactions on metal surfaces with chemical accuracy.
- AIMD and quantum dynamics offer pathways to model phonon effects on N(2) chemisorption.
- Electronic friction combined with AIMD may accurately describe electron-hole pair excitations.
- MCTDH provides a route for quantum mechanical treatment of polyatomic molecule chemisorption.
Conclusions:
- Overcoming challenges in theoretical predictions will significantly improve understanding of heterogeneously catalyzed reactions.
- Advanced computational methods like SRP-DFT, AIMD, and MCTDH are vital for accurate surface reaction modeling.
- Accurate theoretical predictions are critical for the development of more efficient chemical processes.
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