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H-2/D-2 exchange reaction on mono-disperse Pt clusters: enhanced activity from minute O-2 concentrations

J. N. Riedel ; M. D. Rotzer ; Mikkel Jørgensen (Institutionen för fysik, Kemisk fysik (Chalmers) ; Kompetenscentrum katalys (KCK)) ; U. G. Vej-Hansen ; T. Pedersen ; B. Sebok ; F. F. Schweinberger ; P. C. K. Vesborg ; O. Hansen ; J. Schiotz ; U. Heiz ; I. Chorkendorff
Catalysis Science & Technology (2044-4753). Vol. 6 (2016), 18, p. 6893-6900.
[Artikel, refereegranskad vetenskaplig]

The H-2/D-2 exchange reaction was studied on mono-disperse Pt-8 clusters in a mu-reactor. The chemical activity was studied at temperatures varying from room temperature to 180 degrees C using mass spectrometry. It was found that minute amounts of O-2 in the gas stream increased the chemical activity significantly. XPS and ISS before and after reaction suggest little or no sintering during reaction. A reaction pathway is suggested based on DFT. H-2 desorption is identified as the rate- limiting step and O-2 is confirmed as the source of the increased activity. The binding energy of platinum atoms in a SiO2 supported Pt-8 cluster is found to be comparable to the interatomic binding energies of bulk platinum, underlining the stability of the model system.



Denna post skapades 2016-11-25.
CPL Pubid: 245637

 

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Institutioner (Chalmers)

Institutionen för fysik, Kemisk fysik (Chalmers)
Kompetenscentrum katalys (KCK)

Ämnesområden

Fysik

Chalmers infrastruktur