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Impact of Preparation Method and Hydrothermal Aging on Particle Size Distribution of Pt/γ-Al$_{2}$O$_{3}$ and Its Performance in CO and NO Oxidation

Ogel, E.; Casapu, M.; Doronkin, D. E.; Popescu, R.; Störmer, H.; Mechler, C.; Marzun, G.; Barcikowski, S.; Türk, M.; Grunwaldt, J.-D.

Abstract:
The influence of the preparation method and the corresponding particle size distribution on the hydrothermal deactivation behavior at 600–800 °C and performance during CO/NO oxidation was systematically investigated for a series of Pt/Al$_{2}$O$_{3}$ catalysts. Representative conventional (incipient wetness impregnation) and advanced preparation methods (flame spray pyrolysis, supercritical fluid reactive deposition, and laser ablation in liquid) were selected, which generated samples containing narrow and homogeneous but also heterogeneous particle size distributions. Basic characterization was conducted by inductively coupled plasma-optical emission spectrometry, N$_{2}$ physisorption, and X-ray diffraction. The particle size distribution and the corresponding oxidation state were analyzed using transmission electron microscopy and X-ray absorption spectroscopy. The systematic study shows that oxidized Pt nanoparticles smaller than 2 nm sinter very fast, already at 600 °C, but potential chlorine traces from the catalyst precursor seem to stabilize Pt nanoparticles against further sintering and consequently maintain the catalytic performance. ... mehr

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Postprint §
DOI: 10.5445/IR/1000099740
Veröffentlicht am 29.01.2020
Originalveröffentlichung
DOI: 10.1021/acs.jpcc.8b11065
Scopus
Zitationen: 24
Web of Science
Zitationen: 22
Dimensions
Zitationen: 20
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Technische Chemie und Polymerchemie (ITCP)
Institut für Technische Thermodynamik und Kältetechnik (ITTK)
Laboratorium für Elektronenmikroskopie (LEM)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 03.2019
Sprache Englisch
Identifikator ISSN: 1932-7447, 1932-7455
KITopen-ID: 1000099740
HGF-Programm 37.03.01 (POF III, LK 01) Catalysts and Mechanisms
Weitere HGF-Programme 56.98.01 (POF III, LK 01) Betrieb in MML
Erschienen in The journal of physical chemistry <Washington, DC> / C
Verlag American Chemical Society (ACS)
Band 123
Heft 9
Seiten 5433–5446
Vorab online veröffentlicht am 28.01.2019
Nachgewiesen in Dimensions
Web of Science
Scopus
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