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Kr/Xe Separation over a Chabazite Zeolite Membrane.

Xuhui Feng1, Zhaowang Zong1, Sameh K Elsaidi2

  • 1Chemical and Biological Engineering Department, Colorado School of Mines , Golden, Colorado 80401, United States.

Journal of the American Chemical Society
|July 28, 2016
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Chabazite zeolite SAPO-34 membranes efficiently separate krypton (Kr) and xenon (Xe) gas mixtures. These membranes offer high permeances and selectivities for industrial applications, including air separation and nuclear reprocessing.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Separation Science

Background:

  • Krypton (Kr) and xenon (Xe) separation is crucial for nuclear fuel reprocessing and air separation industries.
  • Existing separation methods often face challenges with efficiency and cost-effectiveness.

Purpose of the Study:

  • To investigate the efficacy of chabazite zeolite SAPO-34 membranes for separating Kr/Xe gas mixtures.
  • To optimize membrane properties for industrial-scale gas separation.

Main Methods:

  • Fabrication of SAPO-34 membranes with controlled thickness and crystal size.
  • Gas permeation experiments using Kr/Xe mixtures at industrially relevant compositions.
  • Analysis of separation performance, including permeance and selectivity.

Main Results:

  • SAPO-34 membranes achieved high Kr permeances (up to 1.2 × 10^-7 mol/m^2 s Pa) and selectivities (up to 45).
  • Effective separation was demonstrated for compositions relevant to both air separation and nuclear reprocessing.
  • Molecular sieving and diffusivity differences were identified as key separation mechanisms.

Conclusions:

  • SAPO-34 membranes present a promising solution for efficient Kr/Xe gas mixture separation.
  • Tunable membrane properties allow for optimization for specific industrial applications.
  • The findings support the potential of zeolite membranes in advanced separation technologies.