Impact of co-adsorbed oxygen on crotonaldehyde adsorption over gold nanoclusters: a computational study

Constantinos D. Zeinalipour-Yazdi, David J. Willock, Andreia Machado, Karen Wilson, Adam F. Lee

Research output: Contribution to journalArticle

Abstract

Crotonaldehyde (2-butenal) adsorption over gold sub-nanometer particles, and the influence of co-adsorbed oxygen, has been systematically investigated by computational methods. Using density functional theory, the adsorption energetics of crotonaldehyde on bare and oxidised gold clusters (Au , d = 0.8 nm) were determined as a function of oxygen coverage and coordination geometry. At low oxygen coverage, sites are available for which crotonaldehyde adsorption is enhanced relative to bare Au clusters by 10 kJ mol. At higher oxygen coverage, crotonaldehyde is forced to adsorb in close proximity to oxygen weakening adsorption by up to 60 kJ mol relative to bare Au. Bonding geometries, density of states plots and Bader analysis, are used to elucidate crotonaldehyde bonding to gold nanoparticles in terms of partial electron transfer from Au to crotonaldehyde, and note that donation to gold from crotonaldehyde also becomes significant following metal oxidation. At high oxygen coverage we find that all molecular adsorption sites have a neighbouring, destabilising, oxygen adatom so that despite enhanced donation, crotonaldehyde adsorption is always weakened by steric interactions. For a larger cluster (Au, d = 1.1 nm) crotonaldehyde adsorption is destabilized in this way even at a low oxygen coverage. These findings provide a quantitative framework to underpin the experimentally observed influence of oxygen on the selective oxidation of crotyl alcohol to crotonaldehyde over gold and gold-palladium alloys.
Original languageEnglish
Pages (from-to)11236-11244
Number of pages9
JournalPhysical Chemistry Chemical Physics
Volume16
Issue number23
DOIs
Publication statusPublished - 21 Jun 2014

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2-butenal
Nanoclusters
nanoclusters
Gold
gold
Oxygen
Adsorption
adsorption
oxygen
palladium alloys
gold alloys
oxidation
Palladium alloys
Gold alloys

Bibliographical note

This article is licensed under a Creative Commons Attribution 3.0 Unported Licence.

Funding: EPSRC (EP/E046754/1; EP/G007594/3 and award of a Leadership Fellowship and studentship; UK’s National high-performance computing service, HECToR (EP/F067496) through the materials consortium, ARCCA and HPC-Wales super-computer facilities.

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Zeinalipour-Yazdi, Constantinos D. ; Willock, David J. ; Machado, Andreia ; Wilson, Karen ; Lee, Adam F. / Impact of co-adsorbed oxygen on crotonaldehyde adsorption over gold nanoclusters : a computational study. In: Physical Chemistry Chemical Physics. 2014 ; Vol. 16, No. 23. pp. 11236-11244.
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Impact of co-adsorbed oxygen on crotonaldehyde adsorption over gold nanoclusters : a computational study. / Zeinalipour-Yazdi, Constantinos D.; Willock, David J.; Machado, Andreia; Wilson, Karen; Lee, Adam F.

In: Physical Chemistry Chemical Physics, Vol. 16, No. 23, 21.06.2014, p. 11236-11244.

Research output: Contribution to journalArticle

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