Effects of calcination on the CO hydrogenation activity/selectivity properties of potassium-promoted iron/silica
Much of the previous research in Fischer-Tropsch (FT) synthesis has been directed toward development of catalysts having higher selectivities to premium hydrocarbon products such as light olefins or gasoline. Nevertheless, the product distribution of conventional, non-shape-selective FT catalysts is governed by Anderson-Schulz-Flory (ASF) polymerization kinetics which place severe restrictions on the maximum yield of any given product or product range, e.g., a maximum of 47 wt%. C/sub 5/-C/sub 11/ gasoline range hydrocarbons. Attempts to circumvent the limitations of ASF kinetics through incorporation of catalyst additives, strong metal-support interactions, and supported metal clusters have generally met with little success, although these catalyst modifications can be used to tailor catalyst selectivities for branched paraffins, olefins, and alcohols within the constraints of the ASF model. This study was undertaken to determine the effects of potassium level and calcination pretreatment on the activity and selectivity properties of potassium-promoted Fe/SiO/sub 2/. The results reveal that a mild calcination treatment can dramatically influence the activity/selectivity behavior of Fe/K/SiO/sub 2/ catalysts, and they provide evidence of an alternative synthesis route in CO hydrogenation on these catalysts. 28 references.
- Research Organization:
- Brigham Young Univ., Provo, UT
- OSTI ID:
- 5539457
- Journal Information:
- J. Catal.; (United States), Vol. 100:2
- Country of Publication:
- United States
- Language:
- English
Similar Records
Hydrocarbon selectivity model for gas-solid Fischer-Tropsch synthesis on precipitated iron catalysts
Fischer-Tropsch synthesis over reduced and unreduced iron oxide catalysts
Related Subjects
CARBON MONOXIDE
METHANATION
CATALYSTS
CALCINATION
IRON
CATALYTIC EFFECTS
POTASSIUM
ALCOHOLS
ALKANES
ALKENES
CATALYST SUPPORTS
CHEMICAL PREPARATION
CHEMICAL REACTION YIELD
FISCHER-TROPSCH SYNTHESIS
GASOLINE
PROMOTERS
SILICA
ALKALI METALS
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
DECOMPOSITION
ELEMENTS
FUELS
HYDROCARBONS
HYDROXY COMPOUNDS
LIQUID FUELS
METALS
MINERALS
ORGANIC COMPOUNDS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PETROLEUM PRODUCTS
PYROLYSIS
SILICON COMPOUNDS
SILICON OXIDES
SYNTHESIS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS
YIELDS
010408* - Coal
Lignite
& Peat- C1 Processes- (1987-)