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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:
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 an 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.


Verlagsausgabe §
DOI: 10.5445/IR/1000126078
Veröffentlicht am 09.02.2021
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Katalyseforschung und -technologie (IKFT)
Institut für Technische Chemie und Polymerchemie (ITCP)
Publikationstyp Zeitschriftenaufsatz
Publikationsdatum 02.12.2020
Sprache Englisch
Identifikator ISSN: 1439-4235, 1439-7641
KITopen-ID: 1000126078
HGF-Programm 37.03.01 (POF III, LK 01) Catalysts and Mechanisms
Weitere HGF-Programme 38.99.01 (POF IV, LK 01) Institutsbeiträge MTET
Erschienen in ChemPhysChem
Verlag John Wiley and Sons
Band 21
Heft 23
Seiten 2497-2501
Projektinformation TRR 150/2 (DFG, DFG KOORD, TRR 150/2 2019)
Vorab online veröffentlicht am 29.10.2020
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