Journal
ACS CATALYSIS
Volume 5, Issue 4, Pages 2028-2034Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cs502048w
Keywords
laser-induced fluorescence; imaging catalysis; CO oxidation; Pd(110); gas phase
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Funding
- Knut and Alice Wallenberg Foundation
- Swedish Research Council
- European Scientific Research Council (ERC) through DALDECS program
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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.
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