Partial oxidation of ethane over supported vanadium pentoxide catalysts
- Univ. of Szeged (Hungary)
The partial oxidation of ethane has been studied on silica-supported V{sub 2}O{sub 5} catalyst in a fix-bed continuous-flow reactor at 775-823 K. The temperature-programmed reduction of V{sub 2}O{sub 5} was also investigated. Using N{sub 2}O as oxidant, the main oxidation products were ethylene, acetaldehyde, CO, and CO{sub 2}. Small amounts of CH{sub 4}, and C{sub 3}- and C{sub 4}-hydrocarbons were also identified. The selectivities for ethylene and acetaldehyde at 823 K were 57.5 and 5.1%, respectively. The introduction of water increased the rate of acetaldehyde and CO formation, but decreased that of ethylene. Kinetic orders were determined for all products. The activation energies for the formation of C{sub 2}H{sub 4}, CH{sub 3}CHO, CO, and CO{sub 2} were 47.7, 33.3, 27.9, and 21.5 kcal/mol, respectively. Using O{sub 2} as oxidant, the same products were observed, but the conversion was higher and selectivities were lower. The addition of water to the reacting mixture enhanced the selectivity toward ethylene and acetaldehyde formation. A possible mechanism for the oxidation reaction is proposed.
- OSTI ID:
- 6352324
- Journal Information:
- Journal of Catalysis; (USA), Journal Name: Journal of Catalysis; (USA) Vol. 123:1; ISSN 0021-9517; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020400* -- Petroleum-- Processing
ACETALDEHYDE
ACTIVATION ENERGY
ALDEHYDES
ALKANES
ALKENES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CONTROL
ELEMENTS
ENERGY
ETHANE
ETHYLENE
HIGH TEMPERATURE
HYDROCARBONS
HYDROGEN COMPOUNDS
KINETICS
METHANE
NITROGEN COMPOUNDS
NITROGEN OXIDES
NITROUS OXIDE
NONMETALS
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXIDIZERS
OXYGEN
OXYGEN COMPOUNDS
REACTION KINETICS
REDUCTION
SILICON COMPOUNDS
SILICON OXIDES
SYNTHESIS
TEMPERATURE CONTROL
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS
VANADIUM OXIDES
WATER