Make olefins from syn gas
The medium pore zeolite ZSM-5 can be made within a wide range of values of the ratio SiO/sub 2//Al/sub 2/O/sub 3/. The crystal structures of ZSM-5 and Silicalite appear to be very similar. However, Silicalite has essentially no Al. Hence it appears that Silicalite is the limiting form of ZSM-5 when the Al concentration is vanishingly small. A comparison of the properties of ZSM-5 and Silicalite is shown. Silicalite provides an interesting contrast to ZSM-5 owing to the lack of acidity in the former. In comparing products from catalysts based on ZSM-5 and Silicalite, one can discern reactions which result from the acid function in ZSM-5. Our studies on bifunctional catalysts based on ZSM-5 and Silicalite were performed on zeolites or molecular sieves impregnated with Fe and/or Co. The aim was to convert synthesis gas (CO + H/sub 2/), which can be derived from the gasification of coal, to olefins or gasoline. In the case of the ZSM-based catalyst containing Fe, the transition metal catalyzes the hydrogenation of CO, and the acid function of the zeolite catalyzes the conversion of the oxygenates and olefins in the product to aromatics, resulting in a high octane gasoline product. Recent work from our laboratory has clearly shown that if Silicalite is used instead of ZSM-5 as the support, the production of aromatics is almost completely suppressed, and the product stream is rich in olefins. In the present article, molecular sieve based catalysts that can proide olefins are discussed, and some aspects of gasoline production using zeolite based catalysts as well as the control of shift activity are also being considered. 4 tables.
- Research Organization:
- Pittsburgh Energy Technology Center, PA
- OSTI ID:
- 6283589
- Journal Information:
- Hydrocarbon Process.; (United States), Journal Name: Hydrocarbon Process.; (United States); ISSN HYPRA
- Country of Publication:
- United States
- Language:
- English
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10 SYNTHETIC FUELS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ADSORBENTS
ALKENES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
COBALT
COMPARATIVE EVALUATIONS
DATA
ELEMENTS
EXPERIMENTAL DATA
FLUIDS
FUELS
GASES
GASOLINE
HIGH TEMPERATURE
HYDROCARBONS
INFORMATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
IRON
LIQUID FUELS
MATERIALS
MEDIUM PRESSURE
METALS
METHANATION
MINERALS
MOLECULAR SIEVES
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PETROLEUM PRODUCTS
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SYNTHESIS
SYNTHESIS GAS
TESTING
TRANSITION ELEMENTS
YIELDS
ZEOLITES