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Skeletal reactions of hydrocarbons over supported iridium-gold catalysts. [Hydrogenolysis of n-butane, neopentane, and 2,2-dimethylbutane]

Journal Article · · J. Catal.; (United States)
OSTI ID:6356175
;

The reactions of 20:1 hydrogen/hydrocarbon (n-butane, neopentane, and 2,2-dimethylbutane) over silica-supported 0-86 mole % gold/iridium at < 10% conversion had activation energies of 170 kg/mole for n-butane and 2,2-dimethylbutane and of 242 kj/mole for neopentane, and the activation energies were independent of the gold content. The frequency factor of n-butane and 2,2-dimethylbutane decreased with increasing gold content of the catalyst and the product distributions indicated that the hydrogenolysis reaction was in the C/sub 2/-unit mode hydrogenolysis of neopentane had a frequency factor that was independent of the gold content and the reaction occurred only in the iso-unit mode. The iso-unit mode required a single iridium atom as the active site, and the C/sub 2/-unit mode more than one, probably two, adjacent iridium atoms. The surface mechanisms of the hydrogenolyses and the accompanying isomerization reactions are discussed.

Research Organization:
Univ. of Melbourne
OSTI ID:
6356175
Journal Information:
J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 64:2; ISSN JCTLA
Country of Publication:
United States
Language:
English

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Related Subjects

2-2-DIMETHYLPROPANE
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical &amp; Physicochemical Properties
400301* -- Organic Chemistry-- Chemical &amp; Physicochemical Properties-- (-1987)
ACTIVATION ENERGY
ALKANES
BUTANE
CATALYSTS
CATALYTIC EFFECTS
CHEMICAL COMPOSITION
CHEMICAL REACTION KINETICS
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
DATA
ELEMENTS
ENERGY
EXPERIMENTAL DATA
GOLD
HYDROCARBONS
HYDROGEN
HYDROGENATION
INFORMATION
IRIDIUM
ISOMERIZATION
KINETICS
METALS
NONMETALS
NUMERICAL DATA
ORGANIC COMPOUNDS
PLATINUM METALS
QUANTITY RATIO
REACTION KINETICS
SURFACES
TRANSITION ELEMENTS
YIELDS