jp7b08108_si_004.avi (6.99 MB)
Simultaneous Imaging of Gas Phase over and Surface Reflectance of a Pd(100) Single Crystal during CO Oxidation
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posted on 2017-09-30, 00:00 authored by Jianfeng Zhou, Sara Blomberg, Johan Gustafson, Edvin Lundgren, Johan ZetterbergA direct correlation
between the reaction activity and the surface
structure of a catalyst is generally needed to better understand the
mechanisms behind the heterogeneous catalysis process. In this work,
we employed planar laser-induced fluorescence (PLIF) to spatially
resolve the CO2 distribution just above a Pd(100) surface,
and simultaneously monitored the optical reflectance of the surface,
during CO oxidation. We show that when the reaction is in the mass
transfer limited regime, the inhomogeneity of the gas composition
over the sample can lead to an inhomogeneity of the surface reflectance
change arising from oxide formation and surface roughening. The combination
of PLIF and surface reflectance also makes it possible to spatially
resolve and simultaneously follow the dynamics of the gas phase and
the surface on a subsecond time scale during self-sustained reaction
oscillations of a Pd(100) surface, providing insights into the gas–surface
interaction.
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CO 2 distributionlaser-induced fluorescencesurface reflectance changePdsurface structuresubsecond time scaleCO oxidationmass transfersurface reflectanceGas Phaseself-sustained reaction oscillationsgas compositionreaction activityoxide formationCO Oxidationsurface rougheningSurface ReflectanceSimultaneous Imaginggas phasePLIFcatalysis process
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