Improved Fischer-Tropsch synthesis for gasoline over Ru, Ni promoted Co/HZSM-5 catalysts

► More weaker acid sites of Ru-Co/HZSM-5 catalyst are beneficial for GRH production. ► Ru-Co/HZSM-5 catalyst maintained high GRH selectivity and stability. ► Ni-Co/HZSM-5 catalyst showed high CO conversion and GRH selectivity. ► Iso-paraffin content in GRHs increased significantly for the Ni-Co/HZSM-5 catalyst.