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

• Published in: Fuel (Guildford) Vol. 108; pp. 597 - 603
• Main Authors: Wang, Shurong, Yin, Qianqian, Guo, Jinfeng, Ru, Bin, Zhu, Lingjun
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.06.2013; Elsevier
• Subjects: Applied sciences; Cobalt; Energy; Energy. Thermal use of fuels; Exact sciences and technology; Fuels; Gasoline-range hydrocarbon; HZSM-5; Improved Fischer–Tropsch synthesis; Promoter; Promoter; Improved Fischer–Tropsch synthesis; HZSM-5; Gasoline-range hydrocarbon; Cobalt; Ruthenium; Hydrocarbon; Catalyst selectivity; Fischer Tropsch synthesis; Physical properties; Improved Fischer-Tropsch synthesis; Paraffin content; Transmission electron microscopy; Gasoline; Nickel; Chemical properties; X ray diffractometry; Catalyst activity; Catalyst; Low temperature
• ISSN: 0016-2361; 1873-7153
• DOI: 10.1016/j.fuel.2013.02.021

► 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. Improved Fischer–Tropsch synthesis was carried out over Ru, Ni promoted Co/HZSM-5 catalysts to investigate the influence of promoters on the synthesis of gasoline-range hydrocarbons (GRHs, C5–C12 hydrocarbons). The catalysts were characterized by BET, XRD, TEM, H2-TPR and NH3-TPD to clarify their physical and chemical properties. The catalytic activity for GRH production increased significantly with the addition of Ru or Ni promoter. CO conversion increased in the order Co/HZSM-5<Ru–Co/HZSM-5<Ni–Co/HZSM-5. Due to the higher reduction degree and weaker acid sites on the Ru–Co/HZSM-5 catalyst, CO conversion and GRH selectivity increased compared with the Co/HZSM-5 catalyst. Furthermore, the Ru–Co/HZSM-5 catalyst maintained its initial high activity and GRH selectivity after 150h on stream at an optimum temperature of 540K. The Ni–Co/HZSM-5 catalyst also showed high catalytic activity and GRH selectivity even at the relatively low temperature of 524K. For all three catalysts, the content of iso-paraffin in the GRHs increased monotonically, almost linearly, with increase in temperature. For the Ni–Co/HZSM-5 catalyst in particular, the content of iso-paraffin in the GRHs increased very significantly.