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

doi:10.1016/j.cjche.2017.11.001

Chinese Journal of Chemical Engineering ›› 2018, Vol. 26 ›› Issue (4): 747-752.DOI: 10.1016/j.cjche.2017.11.001

• Catalysis, Kinetics and Reaction Engineering • 上一篇下一篇

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

Key Lab for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, China

收稿日期:2017-08-13 修回日期:2017-11-10 出版日期:2018-04-28 发布日期:2018-05-19
通讯作者: Jing Lü,E-mail address:muddylj@tju.edu.cn
基金资助:
Supported by the National Natural Science Foundation of China (21506154) and the Program of Introducing Talents of Discipline to Universities (B06006).

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

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).

摘要/Abstract

摘要： 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.

关键词: Fischer-Tropsch synthesis, Co-precipitation, Carbon monoxide, Hydrogenation, ZrO₂

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

Zhenhua Li, Mengyao Si, Li Xin, Renjie Liu, Runxue Liu, Jing Lü. Cobalt catalysts for Fischer-Tropsch synthesis: The effect of support, precipitant and pH value[J]. Chinese Journal of Chemical Engineering, 2018, 26(4): 747-752.

Zhenhua Li, Mengyao Si, Li Xin, Renjie Liu, Runxue Liu, Jing Lü. Cobalt catalysts for Fischer-Tropsch synthesis: The effect of support, precipitant and pH value[J]. Chin.J.Chem.Eng., 2018, 26(4): 747-752.

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

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

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