Hydrogen permeation through surface modified Pd and PdAg membranes

• Published in: Journal of membrane science 2001-10, Vol.193 (1), p.35-47
• Main Authors: Amandusson, H, Ekedahl, L.-G, Dannetun, H
• Format: Article
• Language: English
• Subjects: Hydrogen; Oxygen; Palladium; Permeation; Silver; TECHNOLOGY; TEKNIKVETENSKAP
• ISSN: 0376-7388; 1873-3123; 1873-3123
• DOI: 10.1016/S0376-7388(01)00414-8

The hydrogen permeation through surface modified Pd and Pd 70Ag 30 membranes has been studied at temperatures between 100 and 350°C. Silver has been evaporated on Pd and Pd 70Ag 30 foils with a thickness of 25 μm in order to study the role of the surface composition in comparison with the membrane bulk composition. The Pd 70Ag 30-based membranes display the largest permeation rates at temperatures below 200°C, while Pd membranes with 20 Å silver evaporated on the upstream side show the largest permeation rates above 200°C. There are, consequently, different rate limiting processes above and below 200°C: at temperatures below 200°C, the bulk diffusion through the membrane is rate limiting, while at temperatures above 200°C, the influence of the surface composition starts to become significant. It has further been concluded that a sharp silver concentration gradient from the surface to the bulk is important for the hydrogen permeation rate at temperatures above 200°C. Adding oxygen to the hydrogen supply will almost totally inhibit the hydrogen permeation rate when a pure Pd membrane surface is facing the upstream side, while for silver-containing surfaces the presence of oxygen has almost no effect. On a clean Pd surface, oxygen effectively consumes adsorbed hydrogen in a water forming reaction. With Ag on the surface, no water formation is detected. Co-supplied CO inhibits the permeation of hydrogen in a similar manner on all studied membrane surfaces, independent of surface silver content.