Study on Mcroscopic Structure and Dehydration Characteristic of Tubular Zeolite Membrane

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  • 管状ゼオライト膜の微細構造と脱水性能に関する研究
  • カンジョウ ゼオライトマク ノ ビサイ コウゾウ ト ダッスイ セイノウ ニ カンスル ケンキュウ

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<p>A novel method has been developed for the structural characterization of a zeolite Na-LTA membrane to be used for the pervaporation (PV) and vapor permeation (VP) dehydration processes from an ethanol/water mixture. The membrane hydrothermally synthesized on an alumina porous support tube was characterized by transmission electron microscopy (TEM) combined with a focused ion beam (FIB) cross-section specimen preparation technique, a Fourier-transform infrared-attenuated total-reflectance method (FTIR-ATR), parallel-beam X-ray diffraction (XRD) and a grazing incidence 2θ scan XRD (GIXRD). The FIB-TEM technique first revealed a columnar Na-LTA crystal and an amorphous grain boundary phase in the surface membrane layer on an alumina porous support tube, and a mixture of Na-LTA crystal and amorphous inside the tube. The compactness of the membrane was defined as a mixed state of the crystal and amorphous substances. A spectral change of the Si-O asymmetric stretching vibration region, measured by the FTIR-ATR, has been successfully applied to clarify the relationship between the compactness of the membrane and the PV dehydration ability. The XRD and GIXRD first clarified a crystal structure change during the PV and the VP dehydration processes of bioethanol and a change of the lattice constants corresponding to the hydrothermal synthesis condition. By combining those methods, the relationship between the fine structure of the membrane and the dehydration ability from an ethanol/water mixture has been demonstrated.</p>

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 68 (1), 9-21, 2019-01-05

    The Japan Society for Analytical Chemistry

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