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Morphological analysis of cerium oxide stabilized nanoporous gold catalysts by soft X-ray ASAXS

Rumancev, C.; von Gundlach, A. R.; Baier, S.; Wittstock, A.; Shi, J.; Benzi, F.; Senkbeil, T.; Stuhr, S.; Garamusx, V. M.; Grunwaldt, J.-D.; Rosenhahn, A.

Abstract:
Nanoporous (np) gold is a promising catalyst material for selective oxidation reactions. Especially the addition of oxide deposits like ceria (CeO2) promises enhanced morphological stability for high temperature applications. Describing such temperature induced morphological changes in porous materials is challenging. Here, X-ray nanoanalysis is particularly promising due to the high penetration depth that allows studying of the bulk properties with high spatial sensitivity. We applied soft X-ray small angle scattering (SAXS) to determine temperature induced structural changes in nanoporous gold catalysts. The results show that CeO2 deposits enhance the temperature stability of the nanoporous gold catalyst. Moreover, we demonstrate the ability of soft X-rays to selectively provide structural information on the stabilizing cerium oxide deposits via resonant, anomalous SAXS (ASAXS) measurements at the cerium M-edge, revealing no growth of the ceria particles.


Zugehörige Institution(en) am KIT Institut für Katalyseforschung und -Technologie (IKFT)
Institut für Technische Chemie und Polymerchemie (ITCP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2017
Sprache Englisch
Identifikator ISSN: 2046-2069
KITopen ID: 1000075720
HGF-Programm 43.22.02; LK 01
Erschienen in RSC Advances
Band 7
Heft 72
Seiten 45344–45350
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