TY - JOUR
T1 - H2/D2 exchange reaction on mono-disperse Pt clusters: enhanced activity from minute O2 concentrations
AU - Riedel, Jakob Nordheim
AU - Rötzer, Marian David
AU - Jørgensen, Mikkel
AU - Vej-Hansen, Ulrik Grønbjerg
AU - Pedersen, Thomas
AU - Sebök, Béla
AU - Schweinberger, Florian Frank
AU - Vesborg, Peter Christian Kjærgaard
AU - Hansen, Ole
AU - Schiøtz, Jakob
AU - Heiz, Ulrich
AU - Chorkendorff, Ib
PY - 2016
Y1 - 2016
N2 - 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.
AB - 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.
U2 - 10.1039/c6cy00756b
DO - 10.1039/c6cy00756b
M3 - Journal article
SN - 2044-4753
VL - 6
SP - 6893
EP - 6900
JO - Catalysis Science & Technology
JF - Catalysis Science & Technology
IS - 18
ER -