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Formation of Hierarchical Pore Structures in Zn/ZSM-5 to Improve the Catalyst Stability in the Aromatization of Branched Olefins

Authors

  • Yeon Ho Kim,

    1. Department of Chemical Engineering and Division of Advanced Nuclear Engineering, Pohang University of Science and Technology (POSTECH), San 31 Hyoja-dong, Pohang 790-784 (Republic of Korea), Fax: (+82) 54-279-5528
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  • Prof. Kyung Hee Lee,

    1. Department of Chemical Engineering and Division of Advanced Nuclear Engineering, Pohang University of Science and Technology (POSTECH), San 31 Hyoja-dong, Pohang 790-784 (Republic of Korea), Fax: (+82) 54-279-5528
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  • Prof. Chang-Mo Nam,

    1. Division of Health and Science, Yeongnam College of Science and Technology, 274 Heunchungro, Daegu 705-307 (Republic of Korea)
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  • Prof. Jae Sung Lee

    Corresponding author
    1. Department of Chemical Engineering and Division of Advanced Nuclear Engineering, Pohang University of Science and Technology (POSTECH), San 31 Hyoja-dong, Pohang 790-784 (Republic of Korea), Fax: (+82) 54-279-5528
    • Department of Chemical Engineering and Division of Advanced Nuclear Engineering, Pohang University of Science and Technology (POSTECH), San 31 Hyoja-dong, Pohang 790-784 (Republic of Korea), Fax: (+82) 54-279-5528
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Abstract

Three Zn/ZSM-5 catalysts with Si/Al ratios of 17, 33, and 42 were treated with a weak base (Na2CO3) to create a hierarchical microporous–mesoporous system and to improve the catalyst stability in the aromatization of 2-methly-2-butene, a model compound that represented branched olefin byproducts that are produced from fluidized catalytic cracking. The Si/Al ratio of the parent ZSM-5 had a critical effect on the nature of the modified pore system. Thus, for Zn/ZSM-5 with a Si/Al ratio of 42, a hierarchical microporous–mesoporous system was formed in which intraparticle bimodal mesopores were in the form of cavities and cylinders, the latter of which connected internal micropores to the external surface of the catalyst. This pore structure was most suitable for enhancing the tolerance to coking and brought a dramatic increase in the catalyst stability in the aromatization of 2-methyl-2-butene.

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