Structure and activity of supported metal catalysts--8. Chemisorption and benzene hydrogenation on palladium/silica catalysts
Journal Article
·
· J. Catal.; (United States)
Catalysts containing 0.5-25Vertical Bar3< Pd on Davison grade 70 and other silicas were prepared, reduced at 300/sup 0/ or 450/sup 0/C, and studied by CO chemisorption, which adsorbs uniformly on all low index planes, and by H/sub 2/ chemisorption, which adsorbs in proportion to surface palladium atoms. The results suggested that no change in the distribution of exposed crystallite planes occurred with increasing size. Crystallite size calculations based on the adsorption studies were confirmed by X-ray and electron microscopic techniques. The specific activity of the catalysts for benzene hydrogenation at 100/sup 0/C was independent of crystallite size but decreased with increasing reduction temperature. This ''reduction effect'' was observed with different supports, Pd contents, and Pd starting salts, and may be due to impurities, metal-support interaction, or other causes.
- Research Organization:
- Warren Spring Lab.
- OSTI ID:
- 7180171
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 58:2; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
02 PETROLEUM
020400* -- Petroleum-- Processing
36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
ACTIVATION ENERGY
AROMATICS
BENZENE
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
CRYSTAL STRUCTURE
ELEMENTS
ENERGY
HIGH TEMPERATURE
HYDROCARBONS
HYDROGENATION
METALS
MICROSTRUCTURE
MINERALS
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PALLADIUM
PLATINUM METALS
SEPARATION PROCESSES
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
SURFACE PROPERTIES
TEMPERATURE EFFECTS
TRANSITION ELEMENTS
020400* -- Petroleum-- Processing
36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
ACTIVATION ENERGY
AROMATICS
BENZENE
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CHALCOGENIDES
CHEMICAL REACTIONS
CHEMISORPTION
CRYSTAL STRUCTURE
ELEMENTS
ENERGY
HIGH TEMPERATURE
HYDROCARBONS
HYDROGENATION
METALS
MICROSTRUCTURE
MINERALS
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PALLADIUM
PLATINUM METALS
SEPARATION PROCESSES
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SORPTION
SURFACE PROPERTIES
TEMPERATURE EFFECTS
TRANSITION ELEMENTS