The adsorption of CO2 and CO on Ca and CaO films studied with MIES, UPS and XPS

被引：76

作者：

Voigts, F. ^{[1
]}

Bebensee, F. ^{[2
]}

Dahle, S. ^{[1
]}

Volgmann, K. ^{[1
]}

Maus-Friedrichs, W. ^{[1
]}

机构：

[1] Tech Univ Clausthal, Inst Phys & Phys Technol, D-38678 Clausthal Zellerfeld, Germany

[2] Univ Erlangen Nurnberg, Lehrstuhl Phys Chem 2, D-91058 Erlangen, Germany

来源：

SURFACE SCIENCE | 2009年 / 603卷 / 01期

关键词：

Metastable induced electron spectroscopy; Photoelectron spectroscopy; Calcium; Calcium oxide; Carbon monoxide; Carbon dioxide; Calcium carbonate; Chemisorption; CARBON-DIOXIDE; MGO SURFACES; OXYGEN; CHEMISORPTION; SPECTROSCOPY; CATALYST; KINETICS; ENERGY; ATOMS;

D O I：

10.1016/j.susc.2008.10.016

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：

Metastable Induced Electron Spectroscopy (MIES), Ultraviolet Photoelectron Spectroscopy (UPS), and X-ray Photoelectron Spectroscopy (XPS) are employed to study the adsorption Of CO2 and CO on Ca and CaO films. Ca films are prepared by evaporation of Ca onto clean Si(1 0 0) Substrates. CaO films are produced by Ca evaporation in an oxygen atmosphere at a substrate temperature of 670 K. CO2 interaction with the Ca films is initiated by dissociation of the impinging molecules leading to the formation of Ca-O bonds. These Ca-O bonds are subsequently consumed in the formation of a closed CaCO3 layer on top of the Surface. CO interaction with the Ca surfaces also leads to the dissociation of the molecule and the formation of Ca-O bonds. We find evidence for the Subsequent formation of CO32 complexes on top of the surface. On CaO surfaces, both CO2 and CO lead to the formation of a closed CaCO3 top layer, though displaying very different reaction rates. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：40 / 49

页数：10

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