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Direct production of light olefins from syngas over potassium modified Fe–Mn catalyst

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Abstract

A series of potassium promoted Fe–Mn catalysts for light olefin synthesis from CO hydrogenation were prepared by the co-precipitation-calcination-impregnation method. The impact of potassium promoter on the textural properties, reduction behavior, adsorption of hydrogen, bulk phase composition and their correlation with Fischer–Tropsch synthesis (FTS) performances were emphatically studied. As revealed by N2 physisorption, the increasing of potassium had no distinct effect on the size of α-Fe2O3 and surface area. H2 temperature-programmed reduction/desorption showed that potassium inhibited the reduction and hydrogen adsorbability of catalysts. CO temperature-programmed desorption showed that potassium enhanced the CO adsorption of catalysts. X-ray photoelectron spectroscopy indicated the enrichment of promoter atoms on the surface of catalysts. The X-ray diffraction and Mössbauer effect spectroscopy results revealed that potassium made carburization easy. After reduction with syngas (H2/CO = 20) for 48 h, FTS test was performed with the syngas (H2/CO = 3.5) in the high temperature Fischer–Tropsch synthesis process. The maximum of CO conversion and selectivity to light olefins was noted on increasing K content (2.8 mol% K/Fe), followed by a significant decline at the excessive potassium level. At the point, the selectivity of light olefins and olefin/paraffin (C2–C4) was 27.75 mol% and 8.54. The results indicated that potassium promoter could inhibit the water gas shift reaction, suppress hydrogenation ability, which promoted the production of light olefins via suppressing the secondary hydrogenation reaction.

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Acknowledgments

We gratefully acknowledge the financial support of Major State Basic Research Program of China (2010CB736203) and the National High-Tech R&D Program of China (2011AA05A204).

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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, Shanghai, 200237, China

    Jiang-Bing Li, Hong-Fang Ma, Hai-Tao Zhang, Wei-Yong Ying & Ding-Ye Fang

  2. Key Laboratory for Green Processing of Chemical Engineering of Xinjiang Bingtuan, School of Chemistry and Chemical Engineering, Shihezi University, Xinjiang, 832003, China

    Jiang-Bing Li

  3. State Key Laboratory of Coal Liquefaction and Coal Chemical Technology, Shanghai, 201203, China

    Qi-Wen Sun

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  1. Jiang-Bing Li
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  2. Hong-Fang Ma
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Correspondence to Wei-Yong Ying.

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Li, JB., Ma, HF., Zhang, HT. et al. Direct production of light olefins from syngas over potassium modified Fe–Mn catalyst. Reac Kinet Mech Cat 112, 409–423 (2014). https://doi.org/10.1007/s11144-014-0716-0

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  • DOI: https://doi.org/10.1007/s11144-014-0716-0

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