NO and deuterium co-adsorption on the reconstructed Pt(100)-hex surface: A temperature programmed reaction study

  • Vovk E
  • Smirnov M
  • Zemlyanov D
  • 2

    Readers

    Mendeley users who have this article in their library.
  • 2

    Citations

    Citations of this article.

Abstract

The deuterium adsorption at 270 K on a reconstructed Pt(100)-hex surface covered by NOadswas studied by means of temperature programmed reaction (TPR). In the case of adsorption on a clean Pt(100)-hex surface the saturated Dadscoverage is 0.06 ML at PH2= 6 × 10-8mbar, whereas the Dadsuptake is enhanced considerably by NO pre-adsorption. First the Dadsuptake increases with increasing NOadscoverage, θNO, reaching a maximum at θNO≈ 0.25 ML, and then decreases to zero. This phenomenon is explained as follows. The NO adsorption on the hex surface leads to the formation of 1 × 1 islands saturated by NOadsand surrounded by the hex phase. The NOads/1 × 1 islands are assumed to modify the hex phase adjacent to the island boundaries, adapting this area for deuterium adsorption. TPR in the co-adsorption layer of NOadsand Dadsis initiated by D2desorption and shows an 'explosive' behaviour, manifesting itself in the narrow TPR peaks of N2and D2O at ∼370 K. The NOadspre-coverage affects the reaction temperature as well. Thus, at NOadscoverage of 0.35-0.40 ML the temperature of the surface explosion increases abruptly by ∼15-20 K. At this coverage the NOads/1 × 1 islands are supposed to modify the rest of the hex phase so that, after further D2adsorption, the surface becomes completely saturated by Dadsand NOadsspecies. A possible mechanism for this is discussed. © 2000 Elsevier Science B.V. All rights reserved.

Author-supplied keywords

  • Deuterium
  • Hydrogen molecule
  • Nitrogen oxides
  • Platinum
  • Surface relaxation and reconstruction

Get free article suggestions today

Mendeley saves you time finding and organizing research

Sign up here
Already have an account ?Sign in

Find this document

Authors

Cite this document

Choose a citation style from the tabs below

Save time finding and organizing research with Mendeley

Sign up for free