CO Oxidation over AuPd(100) from Ultrahigh Vacuum to Near-Atmospheric Pressures: The Critical Role of Contiguous Pd Atoms

It is demonstrated that gas-phase CO pressure higher than ∼0.1 Torr is required to segregate a sufficient amount of Pd to the surface of a well-annealed AuPd(100) sample to form contiguous Pd sites. These contiguous sites are critical in dissociating O2 for low-temperature CO oxidation, where CO che...

Full description

Saved in:
Bibliographic Details
Published in:Journal of the American Chemical Society 2009-04, Vol.131 (16), p.5734-5735
Main Authors: Gao, Feng, Wang, Yilin, Goodman, D. Wayne
Format: Article
Language:English
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:It is demonstrated that gas-phase CO pressure higher than ∼0.1 Torr is required to segregate a sufficient amount of Pd to the surface of a well-annealed AuPd(100) sample to form contiguous Pd sites. These contiguous sites are critical in dissociating O2 for low-temperature CO oxidation, where CO chemisorbed on Au sites clearly participates in the reaction at temperatures below ∼400 K. Measured reaction kinetics demonstrates that the higher reaction rate is achieved on a surface with higher coverages of contiguous Pd sites.
ISSN:0002-7863
1520-5126
DOI:10.1021/ja9008437