The activity for the metathesis of propylene on Mo(CO)/sub 6//Al/sub 2/O/sub 3/
The metathesis of propylene at 53/sup 0/C on molybdenum hexacarbonyl on alumina pretreated at various temperatures has > 99% selectivity to ethylene and 2-butenes. The activity of catalysts pretreated below 100/sup 0/C increased with increasing pulse number and was entirely due to adsorbed Mo(CO)/sub 3/ species. The catalysts could be activated similarly by several ethylene pulses. The highest conversion was obtained on the catalyst pretreated at 280/sup 0/C and having the mildly oxidized Mo(CO)/sub 2/O/sub 2/ composition. Exposure of the catalyst pretreated at 100/sup 0/C to trichloroethylene increased its initial activity by a factor of 90, probably by removal of two carbonyls from Mo(CO)/sub 3/. The reaction was poisoned by water vapor, and the use of fully hydroxylated alumina as support produced inactive catalysts. Molybdenum carbonyl on dehydroxylated alumina, activated at 500/sup 0/C, was about 100 times more active than the catalyst derived from partially hydroxylated alumina. The results suggested that zero- and hexavalent molybdenum were inactive, that molybdenum at a wide range of intermediate oxidation states is active, and that only a small fraction of the molybdenum surface (< 1%) is active. Graphs, tables, and 18 references.
- Research Organization:
- Northwestern Univ., Evanston, IL
- OSTI ID:
- 5749867
- Journal Information:
- J. Catal.; (United States), Journal Name: J. Catal.; (United States) Vol. 52:3; ISSN JCTLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400301* -- Organic Chemistry-- Chemical & Physicochemical Properties-- (-1987)
ADSORPTION
ALKENES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBONYLS
CATALYSIS
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
HYDROCARBONS
MOLYBDENUM COMPOUNDS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
PROPYLENE
SORPTION
TRANSITION ELEMENT COMPOUNDS