Adsorption of ethene on Pt(111) and ordered PtxSn/Pt(111) surface alloys:: A comparative HREELS and DFT investigation

被引：36

作者：

Essen, J. M. ^{[1
]}

Haubrich, J. ^{[1
]}

Becker, C. ^{[1
]}

Wandelt, K. ^{[1
]}

机构：

[1] Univ Bonn, Inst Phys & Theoret Chem, D-53115 Bonn, Germany

来源：

SURFACE SCIENCE | 2007年 / 601卷 / 16期

关键词：

platinum; tin; alloy; ethene; high-resolution electron energy loss spectroscopy; temperature programmed desorption; density functional theory;

D O I：

10.1016/j.susc.2007.06.037

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The adsorption of ethene (C2H4) on Pt(111) and the Pt3Sn/Pt(111) and Pt2Sn/Pt(111) surface alloys has been investigated experimentally by high-resolution electron energy loss spectroscopy and temperature programmed desorption. The experimental results have been compared with density functional theory (DFT) calculations allowing us to perform a complete assignment of all vibration modes and loss features to the species present on the surfaces. On Pt(111) as well as on the Pt-Sn surface alloys an eta(2) di-sigma-bonded conformation of ethene has been found to be the most stable adsorbed form. In addition to this majority species a minor amount of pi-bonded ethene has been identified, which is more abundant on the Pt-Sn surface alloy than on the other surfaces. Additionally the HREELS spectra of ethene on Pt(111) and the Pt-Sn surface alloys differ only slightly in terms of the energetic positions of the loss peaks. (C) 2007 Elsevier B.V. All rights reserved.

引用

页码：3472 / 3480

页数：9

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