Abstract An extensive study of Fischer–Tropsch synthesis (FTS) on carbon nanotubes (CNTs) supported cobalt catalysts with different loadings of cobalt, ruthenium and potassium is reported. Up to 30 wt.% of Co, 1 wt.% of Ru and 0.0066 wt.% of K were added to the catalyst by co-impregnation method. The physicochemical properties, activity and selectivity of the catalysts were assessed. For …