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Effective H2 Separation through Electroless Pore-Plated Pd Membranes Containing Graphite Lead Barriers.

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New composite membranes using palladium and graphite on porous stainless steel offer efficient hydrogen purification for clean energy. These membranes show good performance and mechanical resistance, advancing decarbonization efforts.

Keywords:
composite membraneelectroless platinggraphitehydrogenintermediate layerpalladium

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Energy Technology

Background:

  • Hydrogen is a key clean energy vector for decarbonization.
  • Palladium-based membranes are crucial for H2 purification in production processes.
  • Porous stainless steel (PSS) supports offer advantages for membrane fabrication.

Purpose of the Study:

  • To develop and characterize novel composite membranes for hydrogen purification.
  • To evaluate the performance of palladium films on graphite-modified PSS supports.
  • To assess the mechanical stability and operational reversibility of the membranes.

Main Methods:

  • Fabrication of composite membranes using electroless pore-plating of palladium onto graphite-modified PSS supports.
  • Characterization of palladium layer density and thickness.
  • Hydrogen and nitrogen permeation measurements in both in-out and out-in configurations.
  • Analysis of H2/N2 mixture permeance and evaluation of Sieverts' law adherence.

Main Results:

  • Fully dense palladium layers (approx. 17 μm) were achieved on the modified PSS supports.
  • High H2/N2 selectivity (α ≥ 10,000) and permeance (3.24–4.33 × 10^-4 mol m^-2 s^-1 Pa^-0.5) were obtained at 350-450 °C.
  • Minor deviations from Sieverts' law were observed due to pore infiltration; H2 permeance decreased by ~33% with 40% N2 due to concentration polarization.
  • Membrane performance remained stable after reversing the permeate flux direction, indicating good mechanical resistance.

Conclusions:

  • The developed composite membranes exhibit excellent H2 purification performance and selectivity.
  • The graphite interlayer and pore-plating method enhance palladium layer integrity and membrane stability.
  • These membranes demonstrate robust mechanical properties and operational reversibility, suitable for demanding hydrogen separation applications.