NO and CO Adsorption on Nonhomogeneous Pt(100) Surfaces
Full article
| Общее |
Language:
Английский,
Genre:
Full article,
Status:
Published,
Source type:
Original
|
| Journal |
Langmuir
ISSN: 0743-7463
, E-ISSN: 1520-5827
|
| Output data |
Year: 1999,
Volume: 15,
Number: 1,
Pages: 135-140
Pages count
: 6
DOI:
10.1021/LA980793R
|
| Authors |
Zemlyanov D.Yu.
1
,
Smirnov M.Yu.
1
,
Vovk E.I.
1
|
| Affiliations |
| 1 |
Boreskov Institute of Catalysis, Pr. Akademika Lavrentieva 5, 630090 Novosibirsk, Russia
|
|
The adsorption of NO and CO on a nonhomogeneous Pt(100) surface made up of both the (hex) and (1 × 1) structural phases was studied at 300 K by means of high-resolution electron energy-loss spectroscopy (HREELS). The nonhomogeneous surface was prepared by titrating NOads/(1 × 1) islands formed on the original (hex) surface with deuterium and subsequent heating to desorb residual Dads. The as-prepared surface was assumed to consist of patches of the (1 × 1) structure surrounded by the (hex) surface. The ratio between the (1 × 1) patches and the (hex) area was controlled by the initial coverage of NOads before titration. The exposure of the nonhomogeneous surface to NO or CO at 300 K led to saturation of the (1 × 1) patches first. It was supposed that the NO and CO molecules adsorbing on the (hex) areas quickly diffuse along the surface, meet the (1 × 1) patches, and are “trapped” by them. NOads (COads) spreads on the surface of the (1 × 1) patches. As soon as the (1 × 1) patches are saturated, the adsorption-induced (hex) → (1 × 1) back-reconstruction takes place. The details of the NO and CO adsorption on the nonhomogeneous surface were compared with the process on the reconstructed and unreconstructed Pt(100) surfaces.