Supported transition metal oxides as acid cracking catalysts: periodic trends and their relationship to activity and selectivity
Surface phase oxides bonded to a support such as alumina have not been recognized previously to have acid cracking activities in the league of amorphous silica-alumina to the best of their knowledge. In this paper the relative gas-oil cracking activities of all Group IV, V, and VIB oxides supported on alumina (including alumina and rhenia on alumina) are reported. All of the supported oxides are at a surface coverage about one-third that of a monolayer. Tungsten oxide and niobium oxide on alumina have been identified as solids acids with high activity; while molybdenum oxide and rhenium oxide on alumina lead to high coke and gas make even with steam present as a cofeed in the cracking test. The periodic trends of cracking activity are those expected from the charge-to-radius ratio of the metal cation. This class of surface phase oxide solid acids has a wide range of activities (two orders of magnitude) and may prove useful for matching acid strength to specific reactions. In addition, this class of solid acids maintains surface area and cracking activity following high temperature steam treatment, in contrast to many conventional solid acid catalysts.
- Research Organization:
- Exxon Research and Engineering Co., Annandale, NJ (USA)
- OSTI ID:
- 5231430
- Journal Information:
- J. Catal.; (United States), Vol. 107:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GAS OILS
CATALYTIC CRACKING
TRANSITION ELEMENT COMPOUNDS
CATALYTIC EFFECTS
ALUMINIUM OXIDES
COKE
COMPARATIVE EVALUATIONS
LAYERS
LOADING RATE
MOLYBDENUM OXIDES
NIOBIUM OXIDES
OXIDES
RHENIUM OXIDES
STEAM
TUNGSTEN OXIDES
ALUMINIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
CRACKING
DECOMPOSITION
ENERGY SOURCES
FOSSIL FUELS
FUELS
MOLYBDENUM COMPOUNDS
NIOBIUM COMPOUNDS
OXYGEN COMPOUNDS
PETROLEUM
PETROLEUM FRACTIONS
PETROLEUM PRODUCTS
PYROLYSIS
REFRACTORY METAL COMPOUNDS
RHENIUM COMPOUNDS
THERMOCHEMICAL PROCESSES
TUNGSTEN COMPOUNDS
020400* - Petroleum- Processing