Document Type

Article

Publication Date

10-1993

Journal or Book Title

Physical Review B

Volume

48

Issue

16

First Page

12178

Last Page

12182

DOI

10.1103/PhysRevB.48.12178

Abstract

Different catalytic oxidation effects of Ce on W(110) and W(111) were observed with photo- emission spectroscopy. On Ce-covered W(110), the top W layer is quickly oxidized to a surface monoxide at room temperature. Oxidation is almost halted after the completion of one monolayer of WO. On Ce/W(111), instead of WO, WO3 grows on the surface under the same conditions. The monolayer suboxide formation found on Ce/W(110) and Ce/Ta(110) (as reported earlier) is a direct consequence of the most densely packed structure of the bcc (110) surfaces. The more effective oxidation promotion on the W(111) surface is attributed to its open structure. The mechanism of Ce-catalyzed oxidation is further tested in this study.

Comments

This article is from Pysical Review B 48 (1993): 12178, doi:10.1103/PhysRevB.48.12178. Posted with permission.

Copyright Owner

The American Physical Society

Language

en

File Format

application/pdf

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