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Structural evolution of highly active multicomponent catalysts for selective propylene oxidation

Sprenger, P.; Sheppard, T. L.; Suuronen, J.-P.; Gaur, A.; Benzi, F.; Grunwaldt, J.-D.

Abstract:
Multicomponent Bi-Mo-Fe-Co oxide catalysts prepared via flame spray pyrolysis were tested for selective propylene oxidation, showing high conversion (>70%) and selectivity (>85%) for acrolein and acrylic acid at temperatures of 330 °C. During extended time-on-stream tests (5–7 days), the catalysts retained high activity while undergoing diverse structural changes. This was evident on: (a) the atomic scale, using powder X-ray diffraction, Raman spectroscopy, X-ray absorption spectroscopy, X-ray photoelectron spectroscopy, and transmission electron microscopy; and (b) the microscopic scale, using synchrotron X-ray nanotomography, including full-field holotomography, scanning X-ray fluorescence, and absorption contrast imaging. On the atomic scale, sintering, coke formation, growth, and transformation of active and spectator components were observed. On the microscopic scale, the catalyst life cycle was studied at various stages through noninvasive imaging of a ~50-µm grain with 100-nm resolution. Variation of catalyst synthesis parameters led to the formation of notably different structural compositions after reaction. Mobile bi ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000085878
Veröffentlicht am 24.09.2018
Coverbild
Zugehörige Institution(en) am KIT Institut für Technische Chemie und Polymerchemie (ITCP)
Institut für Katalyseforschung und -Technologie (IKFT)
Publikationstyp Zeitschriftenaufsatz
Jahr 2018
Sprache Englisch
Identifikator ISSN: 2073-4344
urn:nbn:de:swb:90-858787
KITopen-ID: 1000085878
HGF-Programm 43.22.02 (POF III, LK 01)
Erschienen in Catalysts
Band 8
Heft 9
Seiten Art. Nr.: 356
Bemerkung zur Veröffentlichung Gefördert durch den KIT-Publikationsfonds
Schlagworte bismuth molybdate, heterogeneous catalysis, Raman spectroscopy, selective oxidation, synchrotron radiation; tomography, X-ray absorption spectroscopy, X-ray microscopy
Nachgewiesen in Web of Science
Scopus
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