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CO and O overlayers on Pd nanocrystals supported on TiO2(110)

In English

Författare

  • Chi Ming Yim
  • Chi Lun Pang
  • David S. Humphrey
  • Christopher A. Muryn
  • Karina Schulte
  • Ruben Perez
  • Geoff Thornton

Summary, in English

We have prepared a model catalytic system by depositing Pd onto a TiO2(110) surface held at similar to 720 K. Scanning tunneling microscopy (STM) reveals well-defined Pd nanocrystals consisting of (111) top facets with {111} and {100} side facets. The Pd nanocrystals go down to about 10 nm in width and 1.3 nm in height. Top facets can be imaged with atomic resolution, indicating the absence of TiOx encapsulation. The model catalyst was probed by exposure to CO and O-2. By varying the CO exposure, different CO overlayers were formed on the (111) top facets, with coverages ranging from 0.33 to 0.75 of a monolayer. Near edge X-ray absorption fine structure (NEXAFS) measurements at 300 K reveal that at around 0.5 ML coverage, CO is oriented with the molecular axis more or less normal to TiO2(110). Dosing small amounts of O-2 separately on a Pd/TiO2(110) surface led to an overlayer of p(2 x 2)-O formed on the (111) top facet of the Pd nanocrystals at 190 K.

Publiceringsår

2013

Språk

Engelska

Sidor

191-200

Publikation/Tidskrift/Serie

Faraday Discussions

Volym

162

Dokumenttyp

Artikel i tidskrift

Förlag

Royal Society of Chemistry

Ämne

  • Physical Sciences
  • Natural Sciences

Status

Published

ISBN/ISSN/Övrigt

  • ISSN: 1364-5498