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HERFD-XANES and XES as complementary operando tools for monitoring the structure of Cu-based zeolite catalysts during NOx-removal by ammonia SCR

Günter, T; Doronkin, D E; Carvalho, H W P; Casapu, M; Grunwaldt, J-D

In this article, we demonstrate the potential of hard X-ray techniques to characterize catalysts under working conditions. Operando high energy resolution fluorescence detected (HERFD) XANES and valence to core (vtc) X-ray emission spectroscopy (XES) have been used in a spatially-resolved manner to study Cu-zeolite catalysts during the standard-SCR reaction and related model conditions. The results show a gradient in Cu oxidation state and coordination along the catalyst bed as the reactants are consumed. Vtc-XES gives complementary information on the direct adsorption of ammonia at the Cu sites. The structural information on the catalyst shows the suitability of X-ray techniques to understand catalytic reactions and to facilitate catalyst optimization.

Zugehörige Institution(en) am KIT Institut für Katalyseforschung und -Technologie (IKFT)
Institut für Technische Chemie und Polymerchemie (ITCP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2016
Sprache Englisch
Identifikator DOI: 10.1088/1742-6596/712/1/012071
ISSN: 1742-6588, 1742-6596
URN: urn:nbn:de:swb:90-686593
KITopen ID: 1000068659
Erschienen in Journal of physics / Conference Series
Band 712
Heft 1
Seiten Art. Nr.: 012071
Lizenz CC BY 3.0 DE: Creative Commons Namensnennung 3.0 Deutschland
Bemerkung zur Veröffentlichung 16th International Conference on X-Ray Absorption Fine Structure, XAFS 2015; Karlsruhe Institute of Technology (KIT)Karlsruhe; Germany; 23 August 2015 through 28 August 2015
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