Selective oxidative dehydrogenation of butane over V-Mg-O catalysts
Vanadium-magnesium oxides were found to be selective oxidative dehydrogenation catalysts for butane. The selectivity for dehydrogenation increased with increasing vanadium content until an optimum was reached for samples containing 24 to 54 wt% V/sub 2/O/sub 5/. Infrared spectroscopy, X-ray diffraction, Auger electron spectroscopy, and scanning electron microscopy studies of the catalysts suggested that the active component was the compound magnesium orthovanadate. For a given catalyst at about 540/sup 0/C, the selectivity for oxidative dehydrogenation increased with decreasing oxygen-to-butane ratio, decreasing conversion, and decreasing temperature. A selectivity of up to 60% was obtained. The high selectivity for oxidative dehydrogenation instead of oxygenate production is attributed to two factors: the basic surface facilitates desorption of basic butenes and butadiene, and the absence of V=O lowers the oxidation activity of the surface. 28 references.
- Research Organization:
- Northwestern Univ., Evanston, IL
- OSTI ID:
- 5451598
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 105:2; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020400* -- Petroleum-- Processing
ALKALINE EARTH METAL COMPOUNDS
ALKANES
ALKENES
AUGER ELECTRON SPECTROSCOPY
BUTADIENE
BUTANE
BUTENES
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
COHERENT SCATTERING
DEHYDROGENATION
DESORPTION
DIENES
DIFFRACTION
ELECTRON MICROSCOPY
ELECTRON SPECTROSCOPY
HYDROCARBONS
INFRARED SPECTRA
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MICROSCOPY
ORGANIC COMPOUNDS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLYENES
QUANTITY RATIO
SCANNING ELECTRON MICROSCOPY
SCATTERING
SPECTRA
SPECTROSCOPY
TEMPERATURE EFFECTS
TRANSITION ELEMENT COMPOUNDS
VANADATES
VANADIUM COMPOUNDS
VANADIUM OXIDES
X-RAY DIFFRACTION