The formation of a NO-NH₃ coadsorption complex on a Pt(111) surface

A NEXAFS study

authored by

F. Esch, Th Greber, S. Kennou, A. Siokou, S. Ladas, R. Imbihl

Abstract

The adsorption of NO and the coadsorption of NO and NH₃ on Pt(111) has been studied with TDS, work function measurements and near-edge X-ray absorption fine structure spectroscopy (NEXAFS). Pure NO was found to be adsorbed upright at low coverages (θ_NO < 0.25) with a bond length of 1.24 ± 0.05 Å which corresponds to an elongation by 0.1 Å as compared to the gas phase. An additional tilted species forms at high coverages. The formation of a coadsorption complex of NH₃ and low coverage NO shows up in an elongation of NO to 1.28 ± 0.05 Å. In the coadsorption complex NO is adsorbed upright. The formation of such a complex which is held together by strong attractive interactions explains the high abundance of the mixed ¹⁴N¹⁵N reaction product in experiments with isotopically labeled educts in the NO + NH₃ reaction.

Organisation(s)

Institute of Physical Chemistry and Electrochemistry

External Organisation(s)

Fritz Haber Institute of the Max Planck Society (FHI)
Universität Zürich (UZH)
University of Ioannina
University of Patras

Type

Article

Journal

Catalysis letters

Volume

38

Pages

165-170

No. of pages

6

ISSN

1011-372X

Publication date

05.1996

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

Catalysis, General Chemistry

Electronic version(s)

https://doi.org/10.1007/BF00806563 (Access: Closed)