Crystallite size effects in nickel catalysts: cyclohexane dehydrogenation and hydrogenolysis
Journal Article
·
· J. Catal.; (United States)
Crystallite size dependence of cyclohexane dehydrogenation and hydrogenolysis has been studied over silica-supported nickel catalysts. The samples were freshly prepared and sintered catalysts, produced by homogeneous precipitation-deposition and ranging from 25 to 40 wt% Ni on SiO/sub 2/. Crystallite size distributions were determined from magnetization data. Other experimental measurements, such as hydrogen chemisorption and catalytic kinetics, were made in the same cell in order to provide in situ precision. Average crystallite sizes varied from 2 to 4 nm and critical differences were found in this region. Areal rates for dehydrogenation more than doubled, whereas cyclohexane hydrogenolysis decreased by a factor of 5. These findings were shown to be consistent with a model wherein dehydrogenation occurs on crystal face sites and hydrogenolysis on edge positions. Benzene hydrogenolysis followed the same pattern as dehydrogenation, suggesting that common intermediates are involved.
- Research Organization:
- Univ. of Houston, University Park, TX (USA)
- OSTI ID:
- 5327215
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 98:2; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
02 PETROLEUM
020400* -- Petroleum-- Processing
ALKANES
AROMATICS
BENZENE
CATALYSIS
CATALYST SUPPORTS
CATALYTIC EFFECTS
CATALYTIC REFORMING
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
COMPARATIVE EVALUATIONS
CRYSTAL FACES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CYCLOALKANES
CYCLOHEXANE
DEHYDROGENATION
ELEMENTS
GRAIN SIZE
HYDROCARBONS
METALS
MICROSTRUCTURE
MINERALS
NICKEL
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
REFORMER PROCESSES
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SIZE
SYNTHESIS
TRANSITION ELEMENTS
020400* -- Petroleum-- Processing
ALKANES
AROMATICS
BENZENE
CATALYSIS
CATALYST SUPPORTS
CATALYTIC EFFECTS
CATALYTIC REFORMING
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTIONS
COMPARATIVE EVALUATIONS
CRYSTAL FACES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CYCLOALKANES
CYCLOHEXANE
DEHYDROGENATION
ELEMENTS
GRAIN SIZE
HYDROCARBONS
METALS
MICROSTRUCTURE
MINERALS
NICKEL
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
REFORMER PROCESSES
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SIZE
SYNTHESIS
TRANSITION ELEMENTS