Dynamics of subsurface oxygen formation in catalytic water formation on a Rh(111) surface - experiment and simulation

被引：13

作者：

Monine, MI

Schaak, A

Rubinstein, BY

Imbihl, R

Pismen, LM

机构：

[1] Leibniz Univ Hannover, Inst Phys Chem & Elektrochem, D-30167 Hannover, Germany

[2] Technion Israel Inst Technol, Dept Chem Engn, IL-32000 Haifa, Israel

来源：

CATALYSIS TODAY | 2001年 / 70卷 / 04期

关键词：

subsurface oxygen formation; low work function; photoelectron emission microscopy;

D O I：

10.1016/S0920-5861(01)00340-6

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

The catalytic O-2+H-2 reaction on Rh(1 1 1) has been investigated in the 10(-6)-10(-5) mbar range using photoelectron emission microscopy as spatially resolving method. While the reaction without pretreatment of the sample displays simple bistable behavior, we find that after extended pre-oxidation of the sample (p(O2) = 2 x 10(-4) mbar, T = 770 K, t(OX) > 24 h), low work function (LWF) areas develop dynamically in the collision of reaction fronts. The LWF areas have been assigned to subsurface oxygen. We present a simple three-variable model which reproduces the formation of LWF areas in the collision of reaction fronts. (C) 2001 Elsevier Science B.V All rights reserved.

引用

页码：321 / 330

页数：10

共 25 条

[1]

[Anonymous], CHEM PHYSICS SOLID S

[2] Non-linear behaviour in the NO-H-2 reaction over Rh(111) [J].