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Title: Unexpectedly large impact of van der Waals interactions on the description of heterogeneous catalyzed reactions: the water gas shift reaction on Cu(321) as a case example
Author: Prats Garcia, Hèctor
Gamallo Belmonte, Pablo
Sayós Ortega, Ramón
Illas i Riera, Francesc
Keywords: Teoria del funcional de densitat
Catàlisi heterogènia
Anàlisi funcional
Density functionals
Heterogeneus catalysis
Functional analysis
Issue Date: 15-Dec-2015
Publisher: Royal Society of Chemistry
Abstract: The molecular mechanisms of the water gas shift reaction on Cu(321) have been chosen to investigate the effect of dispersion terms on the description of the energy profile and reaction rates. The present study based on periodic DFT calculations shows that including dispersion terms does not change the qualitative picture of the overall reaction, maintaining the rate determining step and the predominant route. However, the effect of dispersion is different for different adsorbates reactants, intermediates or products with a clear net effect and with no compensation of errors. Thus, in the OH+OH H2O+O process the dispersion effects imply up to three orders of magnitude in the calculated reaction rates; the formation of carboxyl is highly disfavoured when dispersion terms are explicitly included and finally, the reaction rate for CO2 production (at 463 K) through cis-COOH dissociation is enhanced by three orders of magnitude by including dispersion terms in the calculation of the energy barrier. Consequently, the inclusion of dispersion terms largely affects the overall potential energy profile and produces tremendous changes in the predicted reaction rates. Therefore, dispersion terms must be included when aiming at obtaining information from macroscopic simulations employing for instance microkinetic or kinetic Monte Carlo approaches, where these effects should be clearly shown.
Note: Versió postprint del document publicat a:
It is part of: Physical Chemistry Chemical Physics, 2016, vol. 18, num. 4, p. 2792-2801
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ISSN: 1463-9076
Appears in Collections:Articles publicats en revistes (Ciència dels Materials i Química Física)

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