Effects of the surface structure of Rh/(. gamma. )-Al/sub 2/O/sub 3/ on the hydrogenolysis of N-pentane, on the oxidation of N-butane, and on the reduction of nitric oxide
The alumina-supported rhodium catalysts tested contained 0.22-8.0 jmole/sq m rhodium. The hydrogenolysis rate of n-pentane (Abstract No. at044709) increased linearly with increasing Rh concentration at low Rh loadings and decreased at high Rh loadings. The n-butane oxidation rate increased linearly with increasing Rh concentrations at low Rh loadings and remained constant at high Rh loadings. The rate of NO hydrogen-reduction increased linearly with increasing Rh concentration at low Rh loadings and increased at high Rh loadings. The n-pentane hydrogenolysis proceeded mainly via the 2,2,4-triadsorbed intermediate to give ethane and propane at low rhodium levels (high dispersion) and via the 1,1,3-triadsorbed state to give methane and butane at high rhodium concentrations. The NO reduction at 100/sup 0/C changed from an activation energy of 15 to 9 kcal/mole and had a fivefold increase in turnover number as the rhodium concentration increased and changed from dispersed to crystalline phase, which indicates a change in mechanism.
- Research Organization:
- Ford Mot. Co.
- OSTI ID:
- 6550127
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 56:1; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
400300* -- Organic Chemistry-- (-1987)
ACTIVATION ENERGY
ALKANES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BUTANE
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
DATA
ENERGY
EXPERIMENTAL DATA
HYDROCARBONS
HYDROGENATION
INDUSTRIAL WASTES
INFORMATION
KINETICS
MANAGEMENT
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PENTANE
PROCESSING
QUANTITY RATIO
REACTION KINETICS
REDUCTION
RHODIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
WASTE MANAGEMENT
WASTE PROCESSING
WASTES