Hydrogenation of conjugated dienes over ZrO/sub 2/ by H/sub 2/ and cyclohexadiene
Hydrogenation of 1,3-butadiene and 2-methyl-1,3-butadiene and equilibration reaction of H/sub 2/-D/sub 2/ were carried out over ZrO/sub 2/ using H/sub 2/ and cyclohexadiene as hydrogen sources. Reaction rates were measured by changing the activation temperature of the catalyst. While the hydrogenation with H/sub 2/ and H/sub 2/-D/sub 2/ equillibration reaction gave an optimum activity at 600/sup 0/C, another optimum was obtained for transfer hydrogenation at 800/sup 0/C. Hence it is concluded that the sites responsible for the transfer hydrogenation are not the same as those which catalyze hydrogenation with H/sub 2/ and H/sub 2/-D/sub 2/ equilibration. Product distributions in n-butenes and methylated butenes were compared on ZrO/sub 2/, ThO/sub 2/, La/sub 2/O/sub 3/, and MgO and were also compared in direct hydrogenation with H/sub 2/ and transfer hydrogenation with cyclohexadiene. Assuming an ionic intermediate, selectivity changes in the monoolefins produced over different catalysts and by different hydrogen sources were interpreted in terms of the variation of the anionic character of the intermediate and the shift of anionic to neutral or cationic intermediate, respectively.
- Research Organization:
- Hokkaido Univ., Sapporo, Japan
- OSTI ID:
- 5683222
- Journal Information:
- J. Catal.; (United States), Vol. 80:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
DIENES
HYDROGENATION
CATALYSIS
CHEMICAL REACTION KINETICS
COMPARATIVE EVALUATIONS
CYCLOALKENES
EQUILIBRIUM
HIGH TEMPERATURE
HYDROGEN
LANTHANUM OXIDES
MAGNESIUM OXIDES
THORIUM OXIDES
ZIRCONIUM OXIDES
ACTINIDE COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ALKENES
CHALCOGENIDES
CHEMICAL REACTIONS
ELEMENTS
HYDROCARBONS
KINETICS
LANTHANUM COMPOUNDS
MAGNESIUM COMPOUNDS
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POLYENES
RARE EARTH COMPOUNDS
REACTION KINETICS
THORIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
400301* - Organic Chemistry- Chemical & Physicochemical Properties- (-1987)