Journal article
H2/D2 exchange reaction on mono-disperse Pt clusters: enhanced activity from minute O2 concentrations
Department of Physics, Technical University of Denmark1
Surface Physics and Catalysis, Department of Physics, Technical University of Denmark2
Technical University of Munich3
Technical University of Denmark4
Computational Atomic-scale Materials Design, Department of Physics, Technical University of Denmark5
Department of Micro- and Nanotechnology, Technical University of Denmark6
Silicon Microtechnology, Department of Micro- and Nanotechnology, Technical University of Denmark7
The H2/D2 exchange reaction was studied on mono-disperse Pt8 clusters in a μ-reactor. The chemical activity was studied at temperatures varying from room temperature to 180 °C using mass spectrometry. It was found that minute amounts of O2 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. H2 desorption is identified as the rate-limiting step and O2 is confirmed as the source of the increased activity. The binding energy of platinum atoms in a SiO2 supported Pt8 cluster is found to be comparable to the interatomic binding energies of bulk platinum, underlining the stability of the model system.
Language: | English |
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Year: | 2016 |
Pages: | 6893-6900 |
ISSN: | 20444761 and 20444753 |
Types: | Journal article |
DOI: | 10.1039/c6cy00756b |
ORCIDs: | Vej-Hansen, Ulrik Grønbjerg , Sebök, Béla , Vesborg, Peter Christian Kjærgaard , Hansen, Ole , Schiøtz, Jakob and Chorkendorff, Ib |