Enhanced Fischer-Tropsch selectivity through sulfur poisoning

Conference · Sat Mar 01 04:00:00 EST 1986 · Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States)

OSTI ID:5557542

Stenger, H G

The Fischer-Tropsch Synthesis (FTS) is the reaction of carbon monoxide and hydrogen to form linear paraffins, primary alcohols and primary and secondary olefins. Olefins comprise about half of the C/sub 2/ to C/sub 10/ species and are insignificant larger than C/sub 11/. Enhanced olefin selectivity in FTS may be desirable for several reasons. For C/sub 2/ and C/sub 3/, increasing olefin selectivity will increase the ability to upgrade this fraction to liquid fuels through polymerization to C/sub 6/ through C/sub 9/ species. For C/sub 4/, C/sub 5/ and C/sub 6/, enhancing olefin formation will produce a suitable feedstock for alkylation to produce a high octane fuel. Thirdly, the olefins in the FTS product is an excellent source of olefins for the chemical industry. An added benefit from increasing olefin selectivity, will be a lower hydrogenation activity of the FTS catalyst which could result in lower methane formation. One method for increasing olefin selectivity is the addition of sulfur compounds to a potassium-promoted iron catalyst. The H/sub 2/S poisoning differed from the DBT poisoning in that H/sub 2/S was added to the catalyst after the catalyst had been exposed to synthesis gas for several days, while DBT was added after reduction but before the catalyst was exposed to synthesis gas. The question to be answered by this work is whether the order of addition of the poison or the chemical state of the poison causes the differences in selectivity.

• Research Organization: Lehigh Univ., Whitaker Lab. number 5, Bethlehem, PA
• OSTI ID: 5557542
• Report Number(s): CONF-860425-
• Conference Information: Journal Name: Am. Chem. Soc., Div. Pet. Chem., Prepr.; (United States) Journal Volume: 31:1
• Country of Publication: United States
• Language: English

Related Subjects

090121* -- Hydrocarbon Fuels-- Chemical Synthesis-- (1976-1989)
10 SYNTHETIC FUELS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ACTIVATION ENERGY
ALCOHOLS
ALKALI METALS
ALKANES
ALKENES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL PREPARATION
CHEMICAL REACTION YIELD
CHEMICAL REACTIONS
DEACTIVATION
ELEMENTS
ENERGY
FISCHER-TROPSCH SYNTHESIS
FLUIDS
FUELS
GASES
HYDROCARBONS
HYDROGEN
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
HYDROGENATION
HYDROXY COMPOUNDS
IRON
METALS
METHANE
NONMETALS
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
POLYMERIZATION
POTASSIUM
SULFIDES
SULFUR
SULFUR COMPOUNDS
SYNTHESIS
SYNTHESIS GAS
TRANSITION ELEMENTS
YIELDS