Dual-path mechanism for catalytic oxidation of hydrogen on platinum surfaces

被引：194

作者：

Völkening, S ^{[1
]}

Bedürftig, K ^{[1
]}

Jacobi, K ^{[1
]}

Wintterlin, J ^{[1
]}

Ertl, G ^{[1
]}

机构：

[1] Max Planck Gesell, Fritz Haber Inst, D-14195 Berlin, Germany

来源：

PHYSICAL REVIEW LETTERS | 1999年 / 83卷 / 13期

关键词：

D O I：

10.1103/PhysRevLett.83.2672

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The catalytic formation of water from adsorbed hydrogen and oxygen atoms on Pt(111) was studied with scanning tunneling microscopy and high resolution electron energy loss spectroscopy. The known complexity of this reaction is explained by the strongly temperature dependent lifetime of the product H2O molecules on the surface. Below the desorption temperature water reacts with unreacted O adatoms to OHad, leading to an autocatalytic process; at higher temperatures sequential addition of H adatoms to O-ad with normal kinetics takes place.

引用

页码：2672 / 2675

页数：4

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