New Sustainable Multilayered Membranes Based on ZrVTi for Hydrogen Purification

Area of Science:

• Materials Science: Development of novel alloys for advanced membrane applications.
• Chemical Engineering: Hydrogen purification and separation technologies.
• Environmental Science: Life cycle assessment of sustainable materials.

Background:

• Palladium (Pd) is a key material for hydrogen purification membranes but is costly and environmentally impactful.
• Limited research exists on multi-element alloys (4-5 components) with low or zero Pd content for hydrogen membranes.
• Group IV and V metals offer high hydrogen permeability, presenting potential sustainable alternatives to Pd.

Purpose of the Study:

• To investigate novel ZrVTi- and ZrVTiPd alloy-based membranes for hydrogen purification.
• To evaluate the performance, structure, and environmental impact of these new membrane materials.
• To tune membrane performance by optimizing deposition conditions for enhanced hydrogen separation.

Main Methods:

• Fabrication of micrometric-based multilayers using high-power impulse magnetron sputtering on porous alumina substrates.
• Characterization of alloy composition, film morphology, and structural properties.
• Testing of hydrogen permeance, selectivity, and embrittlement resistance.
• Life cycle assessment (LCA) to evaluate environmental impact compared to conventional membranes.

Main Results:

• Successfully fabricated dense Pd/Zr_xV_yTi_zPd_w/Pd multilayers with tunable properties.
• Demonstrated that partial substitution of Pd in ZrVTi-based alloys enhances membrane performance.
• Life cycle assessment confirmed reduced environmental impacts for the novel alloy membranes compared to Pd₇₇Ag₂₃ and V₉₃Pd₇ membranes.

Conclusions:

• ZrVTi- and ZrVTiPd alloy membranes are promising alternatives to palladium for sustainable hydrogen purification.
• Optimized deposition conditions allow for tuning membrane performance, including hydrogen permeance and selectivity.
• The developed membranes offer a significant reduction in environmental footprint, contributing to cost-effective and sustainable hydrogen technologies.