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Abstract
A[NEt3H]+[HFe3(CO)11]--alkali metal hydroxide/Y zeolite system has been found to be an effective catalyst precursor for Fischer-Tropsch synthesis of light olefins. Effects of alkali metals on catalytic activity and selectivity for light olefins were investigated. When the M/Fe ratio (M=alkali metal, g.atm/g.atm) was increased, the catalytic activity remarkably increased to reach a maximum [e.g. an effective CO conversion of 32% (amount of CO converted into hydrocarbons based on the CO charged) at K/Fe of 1.7 (g.atm/g.atm), Fe 10wt%/support, P(total)14atm, CO/H2=1, 320°C for [NEt3]+[HFe3- (CO)11]--KOH/HY zeolite]. Further addition of alkali metals caused decrease of the activity. As the amount of alkali metal was increased, the selectivity for olefins increased. The effects of supports, such as NaY zeolite, SiO2 or HZSM5, were also investigated.
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