Effect of Steam During Fischer–Tropsch Synthesis Using Biomass-Derived Syngas
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Fischer–Tropsch synthesis (FTS) with biomass-derived syngas was performed using both iron-based 100Fe/6Cu/4K/25Al catalyst and ruthenium-based 5 % Ru/SiO2 catalyst. During FTS, different concentrations of steam were co-fed with the biomass-derived syngas to promote the water gas shift reaction and increase the H2/CO ratio. On Fe-based catalysts the increase in steam concentration led to lower conversion, while deactivation is not observed on Ru-based catalysts. XRD of the spent iron-based catalyst showed the oxidation of iron carbides. Adding steam inhibited surface carbon deposition, as measured by temperature programmed hydrogenation. The iron carbide phase could be re-carburized by flowing CO. The addition of steam had different effects on these two catalysts. Fe-based catalyst showed significantly lower methane selectivity and greater C5+ hydrocarbon selectivity, while on the Ru-based catalyst, adding steam only showed slightly decreased methane selectivity.
KeywordsSteam Syngas Iron Carbide Methane Selectivity Chain Growth Probability
This research is supported by U.S. Department of Agriculture, under Award Number 11-DG- 11221636-187. The help of Xiaodan Cui from Louisiana State University on Scanning electron microscopy is gratefully appreciated. We thank Kim Hutchison from North Carolina State University for the ICP-OES analysis.
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