Blomberg Sara, Brackmann Christian, Gustafson Johan, Aldén Marcus, Lundgren Edvin, Zetterberg Johan
Division of Synchrotron Radiation Research and Division of Combustion Physics, Lund University , Box 118, SE-221 00 Lund, Sweden.
ACS Catal. 2015 Apr 3;5(4):2028-2034. doi: 10.1021/cs502048w. Epub 2015 Feb 9.
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.
围绕催化样品的气体组成对其表面结构有直接影响，这在进行模型催化剂的原位研究时至关重要。本文展示了在半现实条件下CO氧化过程中靠近Pd(110)表面的气相研究。由平面激光诱导荧光提供的气相图像清楚地显示，与质谱检测到的总浓度相比，在靠近催化活性表面处形成了一个CO分压显著较低的边界层。边界层内CO分压的变化将对催化剂的表面结构和功能产生深远影响，在原位模型催化研究中需要考虑这一点。
