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Fischer–Tropsch synthesis on potassium-modified Fe3O4 nanoparticles

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Abstract

Synthesized magnetite (Fe3O4) nanoparticles, with an average crystallite size of 8 and 22 nm, were investigated for Fischer–Tropsch synthesis reaction to clarify the effects of iron crystallite size and a potassium promoter. The larger crystallite size of Fe3O4 without the potassium promoter showed an increased CO conversion with a lower selectivity of C5+ and olefinic hydrocarbons. This was mainly attributed to the enhanced reduction degree and an abundance of active edge sites of cube-like morphology. However, a modification of Fe3O4 nanoparticles with the potassium promoter significantly changed the product distribution by increasing C5+ and olefinic hydrocarbons with much higher CO conversions. The enhanced activity on the large crystallite size of K-modified Fe3O4 was mainly attributed to an enhanced secondary reaction of olefins formed on the active iron carbide sites. The positive effect of the potassium promoter was much significant on the larger Fe3O4 nanoparticles due to an abundant presence of potassium promoter on the outer surface of the large Fe3O4 nanoparticles with a bigger inter-particular pore diameter for an easy mass transport.

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Acknowledgments

This work was supported by the R&D Center for Valuable Recycling (Global-Top R&D Program) of the Ministry of Environment with a Project Number of GT-14-C-01-038-0. This work was supported by an institutional program Grant (2E25404-15-021) from Korean Institute of Science and Technology. The authors would like to acknowledge the financial support from the National Research Foundation of Korea (NRF) grant funded by the Korea government (NRF-2014R1A1A2A16055557 and NRF-2015M3D3A1A01064898).

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  1. School of Chemical Engineering, Sungkyunkwan University (SKKU), Suwon, Gyeonggi-do, 440-746, Republic of Korea

    Jae Min Cho, Min Hye Jeong & Jong Wook Bae

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  1. Jae Min Cho
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  2. Min Hye Jeong
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  3. Jong Wook Bae
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Correspondence to Jong Wook Bae.

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Cho, J.M., Jeong, M.H. & Bae, J.W. Fischer–Tropsch synthesis on potassium-modified Fe3O4 nanoparticles. Res Chem Intermed 42, 335–350 (2016). https://doi.org/10.1007/s11164-015-2360-3

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