Abstract
We have previously reported on the properties of silicasupported Fe, Co and FeCo alloy for the Fischer-Tropsch (FT) reaction, both at atmospheric pressure and up to 14 atm (14 × 1·0133 × 105 Pa). The selectivity for C2−C3 olefins reported in the literature for these catalysts (particularly FeCo) was found to be somewhat suppressed at higher pressures, although methanol production was enhanced. The present study is concerned with the possible role of olefin insertion on hydrocarbon chain growth and oxygenate production. Results for both ethylene and 1-pentene indicate some incorporation into the next higher carbon number product at low CO conversions, but not a significant effect on overall chain growth. There is a diminution of oxygenate formation with olefin-containing feeds for all catalysts and reaction conditions investigated (250°C, 1 and 7·8 atm). Present results do not exclude a role of olefin insertion in the mechanism of chain growth, but it seems to be a minor one at most.
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