A Moessbauer spectroscopy study of platinum-tin reforming catalysts

Journal Article · Sun Aug 01 04:00:00 EDT 1993 · Journal of Catalysis; (United States)

DOI:https://doi.org/10.1006/jcat.1993.1237· OSTI ID:5719559

Hobson, Jr, M C; Goresh, S L; Khare, G P ^[1]

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1. Engelhard Corp., Iselin, NJ (United States)

Moessbauer spectroscopy measurements were made to observe alloy formation and interaction of tin with the alumina support in two Pt-Sn/alumina catalysts. The catalysts were rich in tin with an atomic ratio of Pt:Sn = 0.7:1. One was prepared by coimpregnation and the other by a sequential impregnation technique. Spectra of samples reduced in a stream of 10% H[sub 2] in argon gave evidence of a solid solution of tin in platinum with a composition approaching Pt[sub 3]Sn for most reduction conditions. A large fraction of the tin, 70-80%, interacted strongly with the alumina and did not alloy with the platinum. Two stannous species were identified in the nonalloyed fraction. One was produced by strong interaction with the alumina and the other was a surface ion. Steaming produced large stable crystallites including the intermetallic, Pt[sub 3]Sn, and SnO[sub 2]. The spectroscopic data were supported by TPR measurements. The results show that platinum and some of the tin reduce between 400 and 700[degrees]K with formation of the alloy. The remaining tin reduces to the stannous state between 800 and 850[degrees]K. 43 refs., 8 figs., 3 tabs.

• OSTI ID: 5719559
• Journal Information: Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 142:2; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020400 -- Petroleum-- Processing
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYST SUPPORTS
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
DISPERSIONS
MIXTURES
MOESSBAUER EFFECT
OXIDES
OXYGEN COMPOUNDS
PLATINUM ALLOYS
PLATINUM METAL ALLOYS
REDUCTION
SOLID SOLUTIONS
SOLUTIONS
STRUCTURAL CHEMICAL ANALYSIS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 0400-1000 K
TIN ALLOYS