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Membrane electrodes, also known as p-ion electrodes, use membranes that selectively interact with free analyte ions, generating a potential difference across the membrane. The resulting membrane potential, known as the asymmetry potential, is not zero even when analyte concentrations on both sides of the membrane are equal. The membrane's response is typically not selective to a single analyte but proportional to the concentration of all ions in the sample solution capable of interacting at...
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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Separation Science

Background:

  • Nanosheet-based MFI membranes are recognized for their efficacy in hydrocarbon isomer separations.
  • Ammonia (NH3) separation from nitrogen (N2) and hydrogen (H2) is crucial for ammonia synthesis and utilization processes.

Purpose of the Study:

  • To evaluate the performance of nanosheet-based MFI membranes for NH3/N2 and NH3/H2 mixture separations.
  • To investigate the influence of temperature and pressure on membrane separation factors and permeance.

Main Methods:

  • Fabrication of nanosheet-based MFI membranes.
  • Gas permeation experiments at room temperature and elevated temperatures (323 K).
  • Testing with binary mixtures of NH3/N2 and NH3/H2 under varying pressures (3 and 7 bar).

Main Results:

  • Achieved high NH3/N2 separation factor (2236) and NH3 permeance (1.1 × 10-6 mol m-2 s-1 Pa-1).
  • Demonstrated significant NH3/H2 separation factor (307) with NH3 permeance (2.3 × 10-6 mol m-2 s-1 Pa-1).
  • Observed increased separation factors at lower temperatures and higher pressures, consistent with competitive sorption.

Conclusions:

  • Nanosheet-based MFI membranes exhibit excellent performance for NH3/N2 and NH3/H2 separations.
  • These membranes are suitable for separation and purification in ammonia-related industrial processes.
  • The membranes also show potential for separating light hydrocarbons (ethane, propane, butane) from H2.