6533b823fe1ef96bd127f40c
RESEARCH PRODUCT
The influence of water and of alkali promotor on the carbon number distribution of fischer-tropsch products formed over iron catalysts
W. MeiselL. KönigW. GerhardJ. GaubePhilipp GütlichC. Plogsubject
Chemical kineticschemistry.chemical_compoundCalcium carbonatechemistryVapor pressureGeneral Chemical EngineeringInorganic chemistryVapour pressure of waterFischer–Tropsch processAlkali metalCatalysisSyngasdescription
The carbon number distribution of Fischer-Tropsch products formed over an alkalized precipitated iron catalyst has been studied as a function of the water vapor pressure of the synthesis gas. The carbon number distribution of formed hydrocarbons is characterized by a bimodal Schulz-Flory distribution of growth probabilities P1 ≈ 0.6 and P2 ≈ 0.87 attributed to unpromoted and promoted (alkalized) sites on the catalyst surface. Promoted sites are more stable with respect to oxidation (deactivation) by water than unpromoted sites. The growth probability of unpromoted sites decreases with increasing ratio P/P — Studies using Mossbauer spectroscopy have shown that iron foils treated with water containing some K2CO3 yield smaller fractions of iron oxides at the surface than those treated with pure water. Also studies on reduced precipitated iron catalysts using SIMS have shown that alkaline treatment reduces the oxidation of iron by water. These results are interpreted in terms of electronic effects.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1987-02-01 | Berichte der Bunsengesellschaft für physikalische Chemie |