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Syngas conversion beyond chemical equilibrium by in situ bimolecular reaction

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Abstract

An in situ bimolecular reaction, in which syngas is fed with toluene as a secondary reactant (hereafter Tol in situ methylation), was studied over bifunctional catalysts comprised of methanol synthesis catalyst and H-ZSM-5 in a fixed-bed down-flow reactor at 460 psig. When physically mixed with H-ZSM-5 to form bifunctional catalysts, CrZ_HZ (Cr2O3/ZnO + HZSM-5) catalyst showed much higher activity than CZA_HZ (CuO/ZnO/Al2O3 + H-ZSM-5) in the Tol in situ methylation, while CrZ catalyst exhibited substantially lower activity than CZA in methanol synthesis. CO conversion to methanol in the Tol in situ methylation was estimated by Bz in situ methylation. The CO conversion to methanol was calculated to be in the range of 11–27 %, while that in methanol synthesis over CrZ was about 5 % at most due to chemical equilibrium limitation. By employing a silicalite-coated H-ZSM-5 (Sil/HZ) in bifunctional catalyst, xylene selectivity and para-xylene yield were much improved in the Tol in situ methylation.

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Acknowledgments

This work was supported by the Dong-A University research fund.

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Author notes

  1. Seulah Lee

    Present address: Research Center for Green Catalysis, Korea Research Institute of Chemical Technology, Daejon, 305-600, Republic of Korea

Authors and Affiliations

  1. Department of Chemical Engineering, Dong-A University, Busan, 604-714, Republic of Korea

    Donguk Kim, Seulah Lee, Jihye Lee, Yeseul Choi, Jaeuk Shin & Jung Kyoo Lee

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  1. Donguk Kim
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  2. Seulah Lee
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Correspondence to Jung Kyoo Lee.

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Kim, D., Lee, S., Lee, J. et al. Syngas conversion beyond chemical equilibrium by in situ bimolecular reaction. Res Chem Intermed 42, 249–267 (2016). https://doi.org/10.1007/s11164-015-2353-2

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  • DOI: https://doi.org/10.1007/s11164-015-2353-2

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