Journal
CATALYSTS
Volume 9, Issue 5, Pages -Publisher
MDPI
DOI: 10.3390/catal9050484
Keywords
planar laser-induced fluorescence; stagnation flow; CO oxidation; Pd(100)
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Funding
- Knut & Alice Wallenberg Foundation
- Swedish Research Council
- Swedish Foundation for Strategic Research
- Einstein Foundation Berlin through the framework MATHEON/ECMath
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A stagnation flow reactor has been designed and characterized for both experimental and modeling studies of single-crystal model catalysts in heterogeneous catalysis. Using CO oxidation over a Pd(100) single crystal as a showcase, we have employed planar laser-induced fluorescence (PLIF) to visualize the CO2 distribution over the catalyst under reaction conditions and subsequently used the 2D spatially resolved gas phase data to characterize the stagnation flow reactor. From a comparison of the experimental data and the stagnation flow model, it was found that characteristic stagnation flow can be achieved with the reactor. Furthermore, the combined stagnation flow/PLIF/modeling approach makes it possible to estimate the turnover frequency (TOF) of the catalytic surface from the measured CO2 concentration profiles above the surface and to predict the CO2, CO and O-2 concentrations at the surface under reaction conditions.
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