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DOI: 10.1039/C4RA14007A
Scopus
Zitationen: 5
Web of Science
Zitationen: 5

Aging of a Pt/Al₂O₃ exhaust gas catalyst monitored by quasi in situ X-ray micro computed tomography

Hofmann, Georg; Rochet, Amelie; Ogel, Elen; Casapu, Maria; Ritter, Stephan; Ogurreck, Malte; Grunwaldt, Jan-Dierk

Abstract:
Catalyst aging effects were analyzed using X-ray absorption micro-computed tomography in combination with conventional characterization methods on various length scales ranging from nm to [small mu ]m to gain insight into deactivation mechanisms. For this purpose, a 4 wt% Pt/Al2O3 model exhaust gas catalyst was coated on a cordierite honeycomb and subjected to sequential thermal aging in static air at 950 [degree]C for 4, 8, 12 and 24 hours. The aging was followed on the one hand by traditional methods, i.e. CO-oxidation activity, scanning and transmission electron microscopy (SEM, TEM), and X-ray diffraction (XRD). On the other hand, all intermediate aging steps were captured by X-ray absorption micro-computed tomography ([small mu ]-CT) with 1.27 [small mu ]m voxel size using a quasi in situ approach as complementary tool. The [small mu ]-CT data allowed comparing exactly the same position after each treatment using a special alignment procedure during data analysis which took into account that the sample was remounted on the sample holder. A growth of the initially nanometer-sized Pt particles into larger crystals as well as its ... mehr


Zugehörige Institution(en) am KIT Institut für Technische Chemie und Polymerchemie (ITCP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2015
Sprache Englisch
Identifikator ISSN: 2046-2069
URN: urn:nbn:de:swb:90-465649
KITopen ID: 1000046564
HGF-Programm 43.22.02; LK 01
Erschienen in RSC Advances
Band 5
Heft 9
Seiten 6893-6905
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