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Synthesis and gas permeation properties of silicalite-1 zeolite membrane

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Abstract

Silicalite-1/ceramic composite membrane was prepared on the outer surface of the α-Al2O3 tubular support byin-situ hydrothermal synthesis. The membrane was characterized by X-ray diffraction (XRD) and scanning electron microscope (SEM). The pure gas permeances of H2, N2, Ar, CH4, C2H4, C2H6, C3H8, n-C4H10 and i-C4H10 were measured as a function of the pressure difference at 298 and 473 K. The permeances of H2, N2 and Ar showed little dependence on the pressure differences; the permselectivities of H2/i-C4H10 were 249 and 36.2 at 298 and 473 K respectively, which is a characteristic of molecular transport in silicalite-1 channels. The permeances of light alkanes decreased in the following order: CH4>C2H6>C3H8>n-C4H10>i-C4H10. The permselectivity of n-C4H10/i-C4H10 was above 15 at 298 K. As the temperature increased, the permeances of all gases increased except those of N2 and Ar, and a significant increment was found for alkanes. The permselectivity ofn-C4H10/i-C4H10 decreased to about 9 at 473 K. The gas permeation results showed that the silicalite-1/ceramic composite membrane was defect-free.

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Authors and Affiliations

  1. State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 116023, Dalian, China

    Xiaochun Xu, Mojie Cheng, Weishen Yang & Liwu Lin

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  1. Xiaochun Xu
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  2. Mojie Cheng
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  3. Weishen Yang
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  4. Liwu Lin
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Project supported by the National Natural Science Foundation of China and the National Advanced Materials Committee of China

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Xu, X., Cheng, M., Yang, W. et al. Synthesis and gas permeation properties of silicalite-1 zeolite membrane. Sc. China Ser. B-Chem. 41, 325–330 (1998). https://doi.org/10.1007/BF02879715

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  • DOI: https://doi.org/10.1007/BF02879715

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