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

Author

J. N. Riedel

Technical University of Denmark (DTU)

M. D. Rotzer

Technical University of Munich

Mikkel Jørgensen

Competence Centre for Catalysis (KCK)

Chalmers, Physics, Chemical Physics

U. G. Vej-Hansen

Technical University of Denmark (DTU)

T. Pedersen

Technical University of Denmark (DTU)

B. Sebok

Technical University of Denmark (DTU)

F. F. Schweinberger

Technical University of Munich

P. C. K. Vesborg

Technical University of Denmark (DTU)

O. Hansen

Technical University of Denmark (DTU)

J. Schiotz

Technical University of Denmark (DTU)

U. Heiz

Technical University of Munich

I. Chorkendorff

Technical University of Denmark (DTU)

Catalysis Science and Technology

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

Vol. 6 18 6893-6900

Subject Categories

Physical Sciences

DOI

10.1039/c6cy00756b

More information

Latest update

3/16/2018