Elsevier

Surface Science

Volume 36, Issue 1, April 1973, Pages 225-241
Surface Science

Étude par la diffraction des électrons lents et la spectroscopie auger de l'adsorption du soufre sur le platine

https://doi.org/10.1016/0039-6028(73)90257-4Get rights and content

Abstract

The adsorption of sulphur on the (111), (100) and (110) faces of platinum has been studied by LEED and Auger spectroscopy. By the combined use of radioactive S35 the contents of the surface unit meshes were determined “in situ” for each state of adsorption. On the (111) face one observes a preliminary adsorption with localization of sulphur atoms at sites of maximum coordination of the metal. At higher pressures and temperatures, S-S distance contracts and a compact hexagonal arrangement, with sulphur atoms outside sites, is obtained. The thermal stability of the various structures was studied as a function of sulphur coverage. During adsorption on the (100) and (110) faces, two steps may be distinguished: the first one seems to correspond to an adsorption in sites, the second corresponds to the formation of a two-dimensional compound whose square mesh is slightly different on the two faces.

References (5)

  • M. Perdereau

    Surface Sci.

    (1971)
  • M. Kostelitz et al.

    Surface Sci.

    (1973)
There are more references available in the full text version of this article.

Cited by (111)

  • Kinetic studies of the stability of Pt for NO oxidation: Effect of sulfur and long-term aging

    2011, Journal of Catalysis
    Citation Excerpt :

    Also, they found that sulfides are partially transformed to PtSO4 and PtO after calcinations in air at 300 °C and that complete removal of sulfur was achieved at 500 °C. Other studies on Pt (1 0 0) and (1 1 1) crystals [27,28] have also observed sulfur adsorption with saturation coverage ranging from 0.4 to 1. Their results suggest that more sulfur was adsorbed at lower temperatures, reaching sulfur coverage (θs) of 0.92, but heating above 300 °C resulted in the desorption of weakly bonded S resulting in a θs of 0.38–0.5.

View all citing articles on Scopus
View full text