Propane dehydrogenation over supported Pt and Pt-Sn catalysts: Catalyst preparation, characterization, and activity measurements

Journal Article · Mon Jan 01 04:00:00 EST 1996 · Journal of Catalysis

DOI:https://doi.org/10.1006/jcat.1996.0001· OSTI ID:223963

Barias, O A; Holmen, A; Blekkan, E A ^[1]

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1. Norweigian Institute of technology, Trondheim (Norway)

Pt and Pt-Sn catalysts supported on SiO{sub 2} and {gamma}-Al{sub 2}O{sub 3} and prepared by impregnation have been studied by temperature-programmed reduction (TPR), hydrogen chemisorption, temperature-programmed desorption (TPD), and catalytic dehydrogenation of propane. Without the promoter Pt shows the same initial specific activity on both supports, but deactivates rapidly due to coking. The effect of Sn as a promoter depends on the support. On {gamma}-Al{sub 2}O{sub 3} tin interacts with the support and is stabilized in an oxidation state >0. The result is an increase in Pt dispersion and an improved stability of the catalytic activity without any change in the initial specific activity in dehydrogenation. On SiO{sub 2} the Sn is more readily reduced, and alloy formation is possible. This leads to a similar increase in Pt dispersion and improved catalytic stability, but also to a strong reduction in the specific activity. The change in catalytic stability on both supports is paralleled by a dramatic change in the hydrogen adsorption properties, as seen from the TPD profiles after reduction. 53 refs., 9 figs., 5 tabs.

• OSTI ID: 223963
• Journal Information: Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 1 Vol. 158; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
40 CHEMISTRY
ALUMINIUM OXIDES
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL PREPARATION
CHEMISORPTION
COKING
DEHYDROGENATION
DESORPTION
PLATINUM
PROPANE
REDUCTION
SILICA
TIN