Influence of oxygen in the gas-phase hydrogenation of 2-ethyl-hexenal
- Chalmers Univ. of Technology, Goeteborg (Sweden)
The influence of oxygen in the feed on the very fast deactivation of a Pt/Al{sub 2}O{sub 3} catalyst during gas-phase hydrogenation of the unsaturated aldehyde, 2-ethyl-hexenal, was investigated (50-160C, P = 1 atm). The addition of oxygen (< 0.5%) prevented deactivation and the products obtained were saturated aldehyde, saturated alcohol, deoxygenated aldehyde, and in a side reaction CO{sub 2} and heptane. In the absence of oxygen, the simultaneous H{sub 2}-D{sub 2} exchange reaction was inhibited, and the products were saturated aldehyde, saturated alcohol, and in a side reaction CO and heptane. A tested Rh/Al{sub 2}O{sub 3} catalyst was deactivated quickly like Pt/Al{sub 2}O{sub 3} and the addition of oxygen restored the activity, while the tested Pd/Al{sub 2}O{sub 3} and Ru/Al{sub 2}O{sub 3} catalysts were not found to deactivate quickly and the addition of oxygen did not increase the activity. The fast deactivation on Pt/Al{sub 2}O{sub 3} and Rh/Al{sub 2}O{sub 3} might be explained by a side reaction producing CO (R-CH=O {r arrow} R-H + CO) and the reactivating effect of oxygen addition might be explained by CO{sub 2} produced instead of CO in the side reaction.
- OSTI ID:
- 7106508
- Journal Information:
- Journal of Catalysis; (United States), Journal Name: Journal of Catalysis; (United States) Vol. 132:2; ISSN 0021-9517; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020400* -- Petroleum-- Processing
ALCOHOLS
ALDEHYDES
ALKANES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
DEACTIVATION
DEUTERIUM
ELEMENTS
HEPTANE
HYDROCARBONS
HYDROGEN ISOTOPES
HYDROGENATION
HYDROXY COMPOUNDS
ISOTOPES
ISOTOPIC EXCHANGE
LIGHT NUCLEI
METALS
NONMETALS
NUCLEI
ODD-ODD NUCLEI
ORGANIC COMPOUNDS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PALLADIUM
PLATINUM
PLATINUM METALS
RHODIUM
RUTHENIUM
STABLE ISOTOPES
SYNTHESIS
TRANSITION ELEMENTS