Wednesday, 2 November 2005 - 4:15 PM
407d

Palladium Coated Vanadium Alloy Membranes for Hydrogen Separation

Stephen N. Paglieri, Los Alamos National Laboratory, P.O. Box 1663, MS-C348, Los Alamos, NM 87545, David R. Pesiri, SDC Materials, 940 South Park Lane, Suite #2, Tempe, AZ 85281, Robert C. Dye, DX-2, Los Alamos National Laboratory, P.O. Box 1663, MS-C348, Los Alamos, NM 87545, Thomas J. Venhaus, ESA-TSE, Los Alamos National Laboratory, P.O. Box 1663, MS-C348, Los Alamos, NM 87545, Dhanesh Chandra, Chem. & Met. Engineering, University of Nevada, Reno, 1664 North Virginia Street, MS388, Reno, NV 89557-0042, Craig R. Tewell, Sandia National Laboratory, P.O. Box 5800, Albuquerque, NM 87185, and Ronny C. Snow, MST-7, Los Alamos National Laboratory, P.O. Box 1663, MS-C348, Los Alamos, NM 87545.

Hydrogen-separating membranes have the potential to facilitate the generation of pure hydrogen for use in fuel cells. Palladium alloy tubes and foils are presently used to purify hydrogen. Due to the high cost of palladium, thin metal films supported on hydrogen-permeable substrates are required to reduce membrane cost. Composite metal membranes were fabricated and characterized with respect to hydrogen permeability, permselectivity, and robustness. Vanadium alloys are attractive membrane materials due to high hydrogen permeability, and resistance to hydrogen embrittlement as compared to pure vanadium. However, surface oxides impede hydrogen entry and exit from the metal. Membranes with high hydrogen permeabilities and complete selectivity for hydrogen were fabricated from vanadium alloy foils such as VTi5 and VCu1-10 (wt. %), and coated with thin films (≤ 200 nm) of palladium and palladium alloys to protect from oxidation. Hydrogen flux measurements were performed at 320-450°C and metallic interdiffusion was studied using AES.


Web Page: https://www.ms.ornl.gov/FEM/pdf/Proceedings18Fossil04.pdf

See more of #407 - Inorganic Membranes for Gas and Vapor Separations (02D07)
See more of Separations Division

See more of The 2005 Annual Meeting (Cincinnati, OH)