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Enhanced hydrothermal stability of ZSM-5 formed from nanocrystalline seeds for naphtha catalytic cracking

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Abstract

We successfully synthesized hydrothermally stable ZSM-5 with crystalline nano seeds. We employed a template-free method using ZSM-5 crystalline nano seeds and sodium silicate as a silica source. The prepared ZSM-5 exhibited uniform crystal size and relative crystallinity greater than 100 %. The size of the crystalline nano seed in the scale of 100 nm was found to be the optimum size for obtaining uniform, highly crystalline ZSM-5 with structural stability. After P-modification, the synthesized ZSM-5 with the optimally sized seed showed high hydrothermal stability and improved catalytic naphtha cracking activity compared to a commercial ZSM-5 catalyst. In order to find the elements for the increased hydrothermal stability, the samples were evaluated by studying crystallinity, aluminum spectrum, and acidity using XRD, solid-state NMR, and NH3-TPD, respectively after steaming at 800 °C for 24 h. It is speculated that the increased hydrothermal stability of the ZSM-5 resulted mainly from the increased aluminum structural stability.

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Acknowledgements

This work was funded by the R&D Convergence Program of MSIP(Ministry of Science, ICT and Future Planning) and NST (National Research Council of Science & Technology) of Republic of Korea (Project No. CRC-14-1-KRICT).

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Authors and Affiliations

  1. Division of Green Chemical Process, Korea Research Institute of Chemical Technology (KRICT), Daejeon, 305-600, Republic of Korea

    Na Young Kang, Yu Jin Lee, Jongyoon Bae, Won Choon Choi & Yong-Ki Park

  2. Department of Chemical and Biomolecular Engineering, Department of Chemistry & EEWS, Korea Advanced Institute of Science and Technology, Daejeon, 305-701, Republic of Korea

    Na Young Kang & Seong Ihl Woo

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  1. Na Young Kang
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  2. Seong Ihl Woo
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Correspondence to Yong-Ki Park.

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Kang, N.Y., Woo, S.I., Lee, Y.J. et al. Enhanced hydrothermal stability of ZSM-5 formed from nanocrystalline seeds for naphtha catalytic cracking. J Mater Sci 51, 3735–3749 (2016). https://doi.org/10.1007/s10853-015-9691-8

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  • DOI: https://doi.org/10.1007/s10853-015-9691-8

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