Abstract
Colloidal cobalt nanoparticles with well-defined particle size (ca. 2.7 nm) were synthesized, characterized, and tested in Fischer–Tropsch synthesis (FTS) using water and binary mixtures as solvent. The catalytic results revealed that activity and selectivity strongly depend on the nature and composition of the solvent mixture: the tests in pure water produced light hydrocarbons (C2–C4), while the addition of organic cosolvents increased the activity and shifted the selectivity to higher hydrocarbons (C13–C30). The observed variations in the activity and selectivity were correlated to syngas solubility in the medium used for catalysis. Under the tested conditions, ethanol/water (93/7 v/v) appeared to be the optimum binary solvent in terms of FT activity.
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