Modelling of Pd and Pt Supported on the {111} and {011} Surfaces of Cubic-ZrO2

Alfredsson, Maria and Catlow, C. Richard A. (2001) Modelling of Pd and Pt Supported on the {111} and {011} Surfaces of Cubic-ZrO2. Physical Chemistry Chemical Physics, 3 (18). pp. 4129-4140. ISSN 1463-9076. (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

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The interaction of the noble metals Pd and Pt with the {111} and {011} surfaces of cubic-ZrO2 was examined by employing pseudo-potential plane-wave calculations within two Hamiltonians: the LDA and Perdew-Wang91 (GGA). The most favourable adsorption sites, adsorption energies, density of states and electron-charge density distributions are discussed, where the latter properties provide information on the bonding character between the ad-layer and the support, which is directly related to the catalytic activity. Owing to surface relaxation on the Pd/ZrO2{111} interface, we found a competition between the 1-fold and 3-fold oxygen sites; i.e. the differences in adsorption energies between the various adsorption sites are ca. 20 kJ mol(-1), which in addition suggests that the Pd-adlayer may have significant mobility. We anticipated the Pt-adlayer to be associated with lower surface mobility than the Pd-layer, due to the tendency to favour one particular adsorption site: DeltaE(ads) on top of O-S is similar to 100 kJ mol(-1), while on top of the 3-fold oxygen sites the energy is similar to 60 kJ mol(-1). Also, on the {011} surface, Pt is favoured by 1-fold oxygen coordination, while Pd exhibits higher oxygen coordination, and is adsorbed on the terraces of the {011} surface. Our calculations show the metal-support interactions to be mainly of an electrostatic nature, introduced by a polarisation of the metal ad-layers.

Item Type: Article
Additional information: ISI Document Delivery No.: 477YG Times Cited: 14 Cited Reference Count: 51
Subjects: Q Science
Divisions: Faculties > Science Technology and Medical Studies > School of Physical Sciences > Functional Materials Group
Depositing User: Maria Alfredsson
Date Deposited: 14 Sep 2008 09:12
Last Modified: 07 May 2014 15:30
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