Process for the preparation of linear hydrocarbons with more than 18 carbon atoms.
A catalyst is suggested for the production from synthesis gas of linear hydrocarbons having an average molecular mass of 725-840, a density of 0.912-0.96 g/см3, a solidification temperature of 100.5 - 102°C, a dropping point of 113-122°C, a flow temperature of 113.3-121.5°C and a melting temperature of 94-117°C. The catalyst contains the oxides of iron, copper and potassium and silica. In order to increase the catalyst selectivity towards linear hydrocarbons (CO conversion of 70.6-89.3%), titanium dioxide is added to the catalyst. The catalyst composition is as follows (wt. parts):
Iron oxide (expressed as iron) 100
Process for producing linear hydrocarbons with more than 18 carbon atoms by converting gas mixtures containing carbon monoxide and hydrogen with iron-containing catalysts at 150 to 350oC and 5 to 50 bars, characterised in that the catalysts in addition contain a readily reducible metal oxide, a difficultly reducible metal oxide, SiO2 , and an alkali metal oxide.