Oxidative dehydrogenation of ethylbenzene to styrene over modified palladium catalysts. [Ethylbenzene]
Both styrene and carbon dioxide formation from a 1:1:10:3.5 mole ratio ethylbenzene/oxygen/steam/nitrogen feed increased with increasing temperature (200/sup 0/-300/sup 0/C), but styrene selectivity was higher at the lower temperatures over a ..gamma..-alumina-supported 1Vertical Bar3< by wt palladium/sodium bromide catalyst with a 1:1 bromine-palladium ratio. The styrene formation rate increased linearly with ethylbenzene partial pressure and showed a Langmuir-type dependence on oxygen partial pressure, but the rate of carbon dioxide formation was independent of ethylbenzene partial pressure. The experiments, carried out at normal pressure in a continuous flow, fixed bed reactor, indicated the desirability of lean oxygen conditions for styrene synthesis. Bromide was more effective for both styrene formation and carbon dioxide suppression than the other halide ions, and palladium metal was better than rhodium, ruthenium, or platinum. Of the various metal bromides added to the catalyst, or gas-phase bromides tested, hydrogen bromide was far more effective than any other compound.
- Research Organization:
- Univ. of Tokyo
- OSTI ID:
- 6684697
- Report Number(s):
- CONF-790415-
- Journal Information:
- Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States), Journal Name: Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States) Vol. 24:1; ISSN ACPCA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ALKYLATED AROMATICS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
AROMATICS
BROMIDES
BROMINE COMPOUNDS
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
CHEMICAL REACTORS
COMPARATIVE EVALUATIONS
DEHYDROGENATION
ELEMENTS
HALIDES
HALOGEN COMPOUNDS
HYDROCARBONS
METALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PALLADIUM
PLATINUM METALS
PRESSURE DEPENDENCE
STYRENE
SYNTHESIS
TEMPERATURE EFFECTS
TRANSITION ELEMENTS
YIELDS