Detail publikace

An Atomic-Scale View of CO and H2 Oxidation on a Pt/Fe3O4 Model Catalyst

BLIEM, R. VAN DER HOEVEN, J. ZÁVODNÝ, A. GAMBA, O. PAVELEC, J. DE JONGH, P. SCHMID, M. DIEBOLD, U. PARKINSON, G.

Originální název

An Atomic-Scale View of CO and H2 Oxidation on a Pt/Fe3O4 Model Catalyst

Typ

článek v časopise ve Web of Science, Jimp

Jazyk

angličtina

Originální abstrakt

Metal–support interactions are frequently invoked to explain the enhanced catalytic activity of metal nanoparticles dispersed over reducible metal oxide supports, yet the atomicscale mechanisms are rarely known. In this report, scanning tunneling microscopy was used to study a Pt1-6/Fe3O4 model catalyst exposed to CO, H2, O2, and mixtures thereof at 550 K. CO extracts lattice oxygen atoms at the cluster perimeter to form CO2, creating large holes in the metal oxide surface. H2 and O2 dissociate on the metal clusters and spill over onto the support. The former creates surface hydroxy groups, which react with the support, ultimately leading to the desorption of water, while oxygen atoms react with Fe from the bulk to create new Fe3O4(001) islands. The presence of the Pt is crucial because it catalyzes reactions that already occur on the bare iron oxide surface, but only at higher temperatures.

Klíčová slova

Mars–van Krevelen mechanism; metal– support interactions; oxide surfaces; scanning probe microscopy; supported catalysts

Autoři

BLIEM, R.; VAN DER HOEVEN, J.; ZÁVODNÝ, A.; GAMBA, O.; PAVELEC, J.; DE JONGH, P.; SCHMID, M.; DIEBOLD, U.; PARKINSON, G.

Rok RIV

2015

Vydáno

16. 11. 2015

ISSN

1433-7851

Periodikum

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION

Ročník

54

Číslo

47

Stát

Spolková republika Německo

Strany od

13999

Strany do

14002

Strany počet

4

BibTex

@article{BUT118990,
  author="Roland {Bliem} and Jessi {van der Hoeven} and Adam {Závodný} and Oscar {Gamba} and Jiří {Pavelec} and Petra E. {de Jongh} and Michael {Schmid} and Ulrike {Diebold} and Gareth S. {Parkinson}",
  title="An Atomic-Scale View of CO and H2 Oxidation on a Pt/Fe3O4 Model Catalyst",
  journal="ANGEWANDTE CHEMIE-INTERNATIONAL EDITION",
  year="2015",
  volume="54",
  number="47",
  pages="13999--14002",
  doi="10.1002/anie.201507368",
  issn="1433-7851"
}