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Combined Small- and Wide-angle X-ray Scattering Studies on Oxide-supported Pt Nanoparticles Prepared by a CVS and CVD Process

Guo, Xiaoai; Gao, Kun; Gutsche, Alexander; Seipenbusch, Martin; Nirschl, Hermann

Various model oxide-supported metal catalyst particles (Pt nanodots supported on silica, titania and alumina) prepared by a CVS/CVD process at atmospheric pressure have been studied by using a self-developed SAXS and WAXS laboratory system. It has been shown that simultaneous SAXS and WAXS analyses offer a structural insight into the complexity of the supported metal catalysts, allowing quantitative study on the morphological characteristics of the synthesized oxide-supported catalyst particles and fine structures, including primary particles, internal subunits, mass fractal dimension of the aggregates, surface roughness, and crystallite properties as well as the Pt nanodots. The oxide support particles under study cover a size range of 55-150 nm and the Pt nanodots are in the size range of 1.8-15.8 nm. The SAXS and WAXS results were compared with those by TEM and the XRD reference database, and a good agreement has been found. Experimental findings indicated that SAXS appears to be more effective than WAXS for determining the Pt dot size, especially for Pt dots smaller than 2-4 nm due to the overlapping effect of the scattering sig ... mehr

Zugehörige Institution(en) am KIT Institut für Mechanische Verfahrenstechnik und Mechanik (MVM)
Publikationstyp Zeitschriftenaufsatz
Jahr 2015
Sprache Englisch
Identifikator ISSN: 0032-5910
KITopen ID: 1000050586
Erschienen in Powder Technology
Band 272
Seiten 23-33
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