On the Rotational Intergrowth of Hierarchical FAU/EMT Zeolites

Authors

  • Maryam Khaleel,

    1. Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Ave SE, Minneapolis, MN 55455 (USA)
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  • Andrew J. Wagner,

    1. Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Ave SE, Minneapolis, MN 55455 (USA)
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  • Prof. K. Andre Mkhoyan,

    1. Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Ave SE, Minneapolis, MN 55455 (USA)
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  • Prof. Michael Tsapatsis

    Corresponding author
    1. Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Ave SE, Minneapolis, MN 55455 (USA)
    • Department of Chemical Engineering and Materials Science, University of Minnesota, 421 Washington Ave SE, Minneapolis, MN 55455 (USA)

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  • Support for this work was provided by ADMIRE (Abu Dhabi–Minnesota Institute for Research Excellence) and the NSF (Emerging Frontiers in Research and Innovation 0937706). Part of this work was conducted at the University of Minnesota Characterization Facility, which receives partial support from the NSF through the NNIN program. Computing resources were provided by the Minnesota Supercomputing Institute. M.K. acknowledges support from ADNOC (Abu Dhabi National Oil Company). We thank N. Rangnekar, Dr. S. Hwang (Caltech), and R. Knurr for performing AFM, solid-state NMR and ICP-OES, respectively, and Dr. A. Mittal, Dr. J. Myers, and Prof. H. Gies (RUB) for helpful discussions. Author contributions: M.K. performed materials synthesis and characterization and analyzed and interpreted all experiments. M.T. conceived and directed the project. M.K. and M.T. produced the manuscript and developed the conceptual model of morphology development. A.J.W. and K.A.M. performed and analyzed the STEM-EDX experiments shown in Figure 5.

Abstract

A structural study of a hierarchical zeolite X, which is similar to the one first synthesized by Inayat et al.,12 was performed using transmission electron microscopy imaging and diffraction. Evidence is provided, by comparison to simulations, that this material is an intergrowth of FAU and EMT and a conceptual model is presented for the growth of the FAU material with a small fraction of EMT in an atypical morphology of assembled sheets with well-defined intersection angles.

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