Abstract
Fischer–Tropsch experiments with different H2/CO ratios at high CO conversions have been carried out over an alumina-supported 20 wt % Co–0.5 wt % Re catalyst in a stainless steel fixed-bed reactor at 210 °C and 20 bar and with H2/CO ratios between 1.04 and 2.56. The results indicate that for H2/CO ratios above 2.1, CO conversion levels up to at least 85% can be obtained without significant short-term deactivation or loss of selectivity toward heavier hydrocarbons. Except for very low conversion anomalies, the data collapse into a single trendline for selectivity to C5+ products versus average hydrogen partial pressure in the reactor irrespective of the H2/CO feed ratio. The present results are important for development of small-scale biomass to liquid fuel plants based on a once-through process concept in order to avoid recycle streams.
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