Enhancement of CO2 Selectivity in CHA Type Zeolite Membrane by Controlling a Grain Boundary

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  • Hirosawa Fumiya
    Department of Environmental Chemistry and Chemical Engineering, School of Advanced Engineering Kogakuin University
  • Miyagawa Masaya
    Department of Environmental Chemistry and Chemical Engineering, School of Advanced Engineering Kogakuin University
  • Takaba Hiromitsu
    Department of Environmental Chemistry and Chemical Engineering, School of Advanced Engineering Kogakuin University

Bibliographic Information

Other Title
  • 粒界構造の積極的利用によるCHA膜のCO2選択性向上メカニズム
  • リュウカイ コウゾウ ノ セッキョクテキ リヨウ ニ ヨル CHAマク ノ CO ₂ センタク セイコウ ジョウ メカニズム

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Description

CHA zeolite membranes with pore diameters close to the kinetic diameter of CH4 are expected to be used for separation of CO2 in natural gas. Grain boundaries in zeolite membranes are considered to decrease a membrane performance, however, the selective condensation of CO2 at grain boundaries may improve the CO2 selectivity. In this paper, the effect of grain boundaries on the performance of membranes was investigated by non-equilibrium molecular dynamics simulations. It was found that CO2 permeation against CH4 is enhanced by the condensation of CO2 at the grain boundary inside the membrane. This CO2 condensation increase CO2 selectivity of CHA membrane that exceed the intrinsic selectivity of perfect crystal CHA membrane. This result suggests that more efficient zeolite membranes could be developed by fine controlling of grain boundaries, which shows higher CO2 selectivity than fully crystalline membranes.

Journal

  • ゼオライト

    ゼオライト 38 (4), 110-118, 2021-10-15

    Japan Association of Zeolite

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