Abstract
Recent progress of metallic membranes, especially on those of palladium (Pd) alloys and vanadium (V) alloys is reviewed. On Pd alloy membranes, alloying effects of 5 and 6 group metals to suppress interdiffusion between Pd plate and Fe oxide particles are shown. Also, anomalous temperature dependence of hydrogen permeability in Pd–Ag alloy is shown, suggesting new possibilities of alloy design for Pd alloy membranes to be used in lower operating temperatures. On V alloys, recent topics obtained in JST–CREST project “Development of Innovative Hydrogen Production Technology from Energy Carriers Based on Vanadium Alloy Membranes” are introduced. It is highlighted that high hydrogen flow rate over 9 L/min. has been achieved using a quadruple–layered flat membrane device from a gas mixture of 3H2 ＋N2.
