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Spatially and Temporally Resolved Measurements of NO Adsorption/Desorption over NOx‐Storage Catalyst

Wan, Sui; Guo, Yiran; Häber, Thomas; Suntz, Rainer; Deutschmann, Olaf

Abstract (englisch):
The two-dimensional (2D) temporal evolution of the NO-concentration
over a NOx-storage catalyst is investigated in situ with
planar laser-induced fluorescence (PLIF) in an optically accessible
parallel wall channel reactor. Signal accumulated phase-correlated
2D-recordings of repetitive adsorption/desorption cycles are obtained
by synchronizing the switching of the NO gas flow (on/off) with the
laser and detection system, thereby significantly increasing the signal-to-
noise ratio. The gas compositions at the reactor outlet are
additionally monitored by ex-situ analytics. The impacts of varying
feed concentration, temperature and flow velocities are investigated
in unsteady state. Transient kinetics and the mass transfer limitations
can be interpreted in terms of the NO concentration gradient changes.
The technique presented here is a very useful tool to investigate the
interaction between surface kinetics and the surrounding gas flow,
especially for transient catalytic processes.

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DOI: 10.1002/cphc.202000765
Zugehörige Institution(en) am KIT Institut für Katalyseforschung und -technologie (IKFT)
Institut für Technische Chemie und Polymerchemie (ITCP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 1439-4235, 1439-7641
KITopen-ID: 1000126078
Weitere HGF-Programme 38.99.01 (POF IV, LK 01) Institutsbeiträge MTET
Erschienen in ChemPhysChem
Seiten cphc.202000765
Projektinformation TRR 150/2 (DFG, DFG KOORD, TRR 150/2 2019)
Vorab online veröffentlicht am 29.10.2020
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