H-2/D-2 exchange reaction on mono-disperse Pt clusters: enhanced activity from minute O-2 concentrations
Artikel i vetenskaplig tidskrift, 2016

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.

Författare

J. N. Riedel

Danmarks Tekniske Universitet (DTU)

M. D. Rotzer

Technische Universität München

Mikkel Jørgensen

Kompetenscentrum katalys (KCK)

Chalmers, Fysik, Kemisk fysik

U. G. Vej-Hansen

Danmarks Tekniske Universitet (DTU)

T. Pedersen

Danmarks Tekniske Universitet (DTU)

B. Sebok

Danmarks Tekniske Universitet (DTU)

F. F. Schweinberger

Technische Universität München

P. C. K. Vesborg

Danmarks Tekniske Universitet (DTU)

O. Hansen

Danmarks Tekniske Universitet (DTU)

J. Schiotz

Danmarks Tekniske Universitet (DTU)

U. Heiz

Technische Universität München

I. Chorkendorff

Danmarks Tekniske Universitet (DTU)

Catalysis Science and Technology

2044-4753 (ISSN) 2044-4761 (eISSN)

Vol. 6 18 6893-6900

Ämneskategorier

Fysik

DOI

10.1039/c6cy00756b