Study by EXAFS and TEM of the Effect of the Reduction-Oxidation Cycles over Pt/Al 2 O 3 –K and PtSn/Al 2 O 3 –K Catalysts

TEM and X-Ray absorption spectroscopy at the Pt L III edge have been used to study the effect of several consecutive reduction-oxidation cycles on the state of platinum for two Pt/Al 2 O 3 -K and PtSn/Al 2 O 3 -K catalysts used industrially for the selective dehydrogenation of high molecular weight...

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Bibliographic Details
Published in:Japanese Journal of Applied Physics 1993-01, Vol.32 (S2), p.442
Main Authors: Caballero, Alfonso, Dexpert, Herve, LePeltier, Fabienne, Didillon, Blaise, Lynch, John
Format: Article
Language:English
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Summary:TEM and X-Ray absorption spectroscopy at the Pt L III edge have been used to study the effect of several consecutive reduction-oxidation cycles on the state of platinum for two Pt/Al 2 O 3 -K and PtSn/Al 2 O 3 -K catalysts used industrially for the selective dehydrogenation of high molecular weight paraffins. The results indicate that, whereas the size of the platinum oxide particles in the Pt/Al 2 O 3 -K monometallic catalyst increase after the different reduction-oxidation cycles, the presence of tin induces that platinum binds more strongly to the alumina surface, avoiding the sintering of platinum during the different reduction-oxidation cycles.
ISSN:0021-4922
1347-4065
DOI:10.7567/JJAPS.32S2.442