Chin.J.Chem.Eng. ›› 2018, Vol. 26 ›› Issue (4): 747-752.doi: 10.1016/j.cjche.2017.11.001

• Catalysis, Kinetics and Reaction Engineering • Previous Articles     Next Articles

Cobalt catalysts for Fischer-Tropsch synthesis: The effect of support, precipitant and pH value

Zhenhua Li, Mengyao Si, Li Xin, Renjie Liu, Runxue Liu, Jing Lü   

  1. Key Lab for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China
  • Received:2017-08-13 Revised:2017-11-10 Online:2018-04-28 Published:2018-05-19
  • Supported by:

    Supported by the National Natural Science Foundation of China (21506154) and the Program of Introducing Talents of Discipline to Universities (B06006).

Abstract: In this report, Co-based catalysts supported on ZnO, Al2O3 and ZrO2 as well as the ZrO2 derived from different precipitants and different pH values were prepared by co-precipitation method. Their catalytic Fischer-Tropsch synthesis (FTS) performance was investigated in a fixed-bed reactor. The results revealed that Co catalyst supported on ZrO2 exhibited better FTS catalytic performance than that supported on ZnO or Al2O3. For the Co/ZrO2 catalyst, different precipitants showed the following an activity order of NaOH > Na2CO3 > NH4OH, and the best pH value is 13. The catalysts were characterized by N2 adsorption-desorption, XRF, XRD, H2-TPR, H2-TPD and TEM. It was found that the main factor affecting the CO conversion of the catalyst was the amounts of low-temperature active adsorption sites. Moreover, the selectivity of C5+ hydrocarbons had a positive relationship with the peak temperature of the weak hydrogen adsorption sites. The higher the peak temperature, the higher the C5+ selectivity is.

Key words: Fischer-Tropsch synthesis, Co-precipitation, Carbon monoxide, Hydrogenation, ZrO2