Pd-Cu-M (M= Y, Ti, Zr, V, Nb, and Ni) Alloys for Hydrogen Separation Membrane
Paper ID : 1380-MST2015-FULL
Authors:
Shahrouz Nayebossadri *, Shahrouz Nayebossadri, David Book
University of Birmingham
Abstract:
Palladium-copper (Pd–Cu) alloys are of potential interest for use as hydrogen separation membranes because they are lower in cost and more chemically resistant than the commercially available Pd–Ag membranes. However, their hydrogen permeability and chemical stability needs to be further improved. In this work, self–supported fcc Pd–Cu–M (M= Y, Ti, Zr, V, Nb, and Ni) ternary alloys were studied as potential hydrogen purification membranes. The effects of small additions of these elements on the structure, and hydrogen permeability were examined. Structural analyses by XRD showed fcc phase for all alloys with induced textures from cold rolling. Heat treatment at 650 °C for 96 h led to the re–orientation in all alloys except Pd–Cu–Zr alloy exhibiting structural stability as a result of Zr addition. A comparable hydrogen permeability of Pd–Cu–Zr alloy with the corresponding binary alloy was observed. Hydrogen flux variations of all ternary alloys were studied and compared with Pd65.1Cu34.9 binary alloy under 1000 ppm H2S+H2 feed gas. The marked effect of Zr addition for improving the resistance to the sulphur poisoning was observed and attributed to the less favourable H2S–surface interaction and more importantly to the structural stability of the Pd–Cu–Zr alloy delaying the bulk sulphidation.
Keywords:
Hydrogen separation, Metallic membranes, Pd-based membranes, Pd-Cu, Teranry alloys
Status : Paper Accepted (Oral Presentation)