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Influence of single- and double-flame spray pyrolysis on the structure of MnOₓ/γ-Al₂O₃ and FeOₓ/γ-Al₂O₃ catalysts and their behaviour in CO removal under lean exhaust gas conditions

Tepluchin, Marina; Pham, David K.; Casapu, Maria; Mädler, Lutz; Kureti, Sven; Grunwaldt, Jan-Dierk

Abstract:
MnOx/Al2O3 and FeOx/Al2O3 samples were prepared by two-nozzle flame spray pyrolysis to minimize the formation of composite phases. For this purpose, manganese(ii) naphthenate or iron(ii) naphthenate and aluminium-sec-butylate were sprayed in separate flames and both the structure and the catalytic performance of the materials in CO oxidation were compared to the corresponding single-nozzle flame spray pyrolysis catalysts. Characterization by X-ray diffraction, diffuse reflectance UV-vis spectroscopy and X-ray absorption near-edge structure unravelled that the phases formed in double-flame spray pyrolysis (DFSP) were significantly different from those in single-flame spray pyrolysis; highly dispersed separate entities of manganese/iron oxide and alumina were identified in this case. Despite a slightly lower BET surface area the DFSP prepared samples performed generally better in catalytic CO oxidation than those derived from one single flame. In addition, the manganese-based catalysts were more effective for CO conversion than the corresponding iron-based samples, even at low concentrations.

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Verlagsausgabe §
DOI: 10.5445/IR/1000046551
Veröffentlicht am 19.07.2018
Originalveröffentlichung
DOI: 10.1039/C4CY00727A
Scopus
Zitationen: 23
Dimensions
Zitationen: 24
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Technische Chemie und Polymerchemie (ITCP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2015
Sprache Englisch
Identifikator ISSN: 2044-4753, 2044-4761
urn:nbn:de:swb:90-465514
KITopen-ID: 1000046551
HGF-Programm 43.22.02 (POF III, LK 01) Nanocatalysis
Weitere HGF-Programme 56.98.01 (POF III, LK 01) Betrieb in MML
Erschienen in Catalysis science & technology
Verlag Royal Society of Chemistry (RSC)
Band 5
Heft 1
Seiten 455-464
Bemerkung zur Veröffentlichung RSC geförderter Open Access-Artikel
Nachgewiesen in Web of Science
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Scopus
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