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Updated: Jul 14, 2026

Surface Properties of Synthesized Nanoporous Carbon and Silica Matrices
Published on: March 27, 2019
Structural, energetic, and vibrational properties of NO(x) adsorption on Ag(n), n = 1-8
Henrik Grönbeck1, Anders Hellman, Andreas Gavrin
1Department of Applied Physics and Competence Centre for Catalysis, Chalmers University of Technology, SE-412 96 Göteborg, Sweden. ghj@chalmers.se
Abstract:
The density functional theory is used to explore structural, electronic, and vibrational properties of NO, NO(2), and NO(3) adsorption on small silver clusters, Ag(n), with n =1-8. Generally, NO adsorbs in a top configuration, whereas NO(2) and NO(3) are adsorbed in bridge configuration. NO2 and NO3 introduce pronounced structural relaxations in the clusters. In particular, the transition size from planar to three-dimensional structures is modified. For each cluster size, the adsorption energies follow the trend E(a) (NO) < E(a) (NO(2)) < E(a) (NO(3)). The adsorption energies show a marked odd/even alternation with a stronger bonding to odd clusters. Analysis of the electronic structure reveals an ionic bond mechanism for NO(2) and NO(3). Odd/even effects are also present in vibrational properties of the adsorbed radicals. With respect to the gas phase, the largest shifts are calculated for adsorption on odd clusters. Possible implications of the results for Ag/Al(2)O(3) HC-SCR catalysts are discussed.
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