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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

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 agglomeration was found, preferentially in voids between support grains. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000046564
Veröffentlicht am 19.07.2018
DOI: 10.1039/C4RA14007A
Zitationen: 13
Zitationen: 12
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Technische Chemie und Polymerchemie (ITCP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2015
Sprache Englisch
Identifikator ISSN: 2046-2069
KITopen-ID: 1000046564
HGF-Programm 43.22.02 (POF III, LK 01) Nanocatalysis
Erschienen in RSC Advances
Verlag Royal Society of Chemistry (RSC)
Band 5
Heft 9
Seiten 6893-6905
Bemerkung zur Veröffentlichung RSC geförderter Open Access-Artikel
Nachgewiesen in Dimensions
Web of Science
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