Real-Time Gas-Phase Imaging over a Pd(110) Catalyst during CO Oxidation by Means of Planar Laser-Induced Fluorescence

被引：25

作者：

Blomberg, Sara ^{[1
]}

Brackmann, Christian ^{[2
]}

Gustafson, Johan ^{[1
]}

Alden, Marcus ^{[2
]}

Lundgren, Edvin ^{[1
]}

Zetterberg, Johan ^{[2
]}

机构：

[1] Lund Univ, Div Synchrotron Radiat Res, SE-22100 Lund, Sweden

[2] Lund Univ, Div Combust Phys, SE-22100 Lund, Sweden

来源：

ACS CATALYSIS | 2015年 / 5卷 / 04期

基金：

瑞典研究理事会;

关键词：

laser-induced fluorescence; imaging catalysis; CO oxidation; Pd(110); gas phase; STAGNATION SURFACE; COMBUSTION; REACTIVITY; RESOLUTION; PRESSURES; MECHANISM; PD(100);

D O I：

10.1021/cs502048w

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：

The gas composition surrounding a catalytic sample has direct impact on its surface structure, which is essential when in situ investigations of model catalysts are performed. Herein a study of the gas phase close to a Pd(110) surface during CO oxidation under semirealistic conditions is presented. Images of the gas phase, provided by planar laser-induced fluorescence, clearly visualize the formation of a boundary layer with a significantly lower CO partial pressure close to the catalytically active surface, in comparison to the overall concentration as detected by mass spectrometry. The CO partial pressure variation within the boundary layer will have a profound effect on the catalysts surface structure and function and needs to be taken into consideration for in situ model catalysis studies.

引用

页码：2028 / 2034

页数：7

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