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Effects of Zr and K Promoters on Precipitated Iron-Based Catalysts for Fischer–Tropsch Synthesis

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Abstract

The effects of Zr and K promoters on the structure, adsorption, reduction, carburization and catalytic behavior of precipitated iron-based Fischer–Tropsch synthesis (FTS) catalysts were investigated. The catalysts were characterized by N2 physisorption, temperature-programmed reduction/desorption (TPR/TPD) and Mössbauer effect spectroscopy (MES) techniques. As revealed by N2 physisorption, Zr and/or K promoted catalysts showed lower surface area than Fe/SiO2 catalyst. Zr promoter inhibited the reduction and carburization because of the interaction between Fe and Zr in Fe–Zr/SiO2 catalysts. K promoter enhanced the reduction in CO and apparently facilitated the CO adsorption, thus promoted the carburization, but it retarded the reduction in H2 and severely suppressed the H2 adsorption. Compared with the singly promoted catalysts, the doubly promoted catalyst had the highest FTS activity. In addition, both Zr and K promoters suppressed the formation of methane and shifted the production distribution to heavy hydrocarbons.

Graphical Abstract

Both Zr and K restrained the formation of methane, and increased the heavy hydrocarbons selectivity. In the FTS reaction, the doubly promoted catalyst Fe–Zr–K/SiO2 had the highest FTS activity.

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Acknowledgments

We gratefully acknowledge the financial support from State Key Laboratory of Chemical Engineering (SKL-ChE-09T01).

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Authors and Affiliations

  1. State Key Laboratory of Chemical Engineering, Engineering Research Center of Large Scale Reactor Engineering and Technology of the Ministry of Education, East China University of Science and Technology, 200237, Shanghai, China

    Haojian Zhang, Hongfang Ma, Haitao Zhang, Weiyong Ying & Dingye Fang

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  1. Haojian Zhang
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  2. Hongfang Ma
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  3. Haitao Zhang
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  4. Weiyong Ying
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  5. Dingye Fang
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Correspondence to Weiyong Ying.

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Zhang, H., Ma, H., Zhang, H. et al. Effects of Zr and K Promoters on Precipitated Iron-Based Catalysts for Fischer–Tropsch Synthesis. Catal Lett 142, 131–137 (2012). https://doi.org/10.1007/s10562-011-0739-3

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  • DOI: https://doi.org/10.1007/s10562-011-0739-3

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