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Two‐Dimensional Spatial Resolution of Concentration Profiles in Catalytic Reactors by Planar Laser‐Induced Fluorescence: NO Reduction over Diesel Oxidation Catalysts
Author(s) -
Zellner Alexander,
Suntz Rainer,
Deutschmann Olaf
Publication year - 2015
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201410324
Subject(s) - catalysis , planar laser induced fluorescence , analytical chemistry (journal) , selective catalytic reduction , planar , quenching (fluorescence) , laser induced fluorescence , chemistry , hydrogen , phase (matter) , fluorescence , mass transfer , materials science , photochemistry , chromatography , optics , organic chemistry , physics , computer graphics (images) , computer science
Planar laser‐induced fluorescence (PLIF) enables noninvasive in situ investigations of catalytic flow reactors. The method is based on the selective detection of two‐dimensional absolute concentration maps of conversion‐relevant species in the surrounding gas phase inside a catalytic channel. Exemplarily, the catalytic reduction of NO with hydrogen (2 NO+5 H 2 →2 H 2 O+2 NH 3 ) is investigated over a Pt/Al 2 O 3 coated diesel oxidation catalyst by NO PLIF inside an optically accessible channel reactor. Quenching‐corrected 2D concentration maps of the NO fluorescence above the catalytic surface are obtained under both, nonreactive and reactive conditions. The impact of varying feed concentration, temperature, and flow velocities on NO concentration profiles are investigated in steady state. The technique presented has a high potential for a better understanding of interactions of mass transfer and surface kinetics in heterogeneously catalyzed gas‐phase reactions.