Hydrogen permeation through surface modified Pd and PdAg membranes
2001 (English)In: Journal of Membrane Science, ISSN 0376-7388, Vol. 193, no 1, 35-47 p.Article in journal (Refereed) Published
The hydrogen permeation through surface modified Pd and Pd70Ag30 membranes has been studied at temperatures between 100 and 350°C. Silver has been evaporated on Pd and Pd70Ag30 foils with a thickness of 25µm in order to study the role of the surface composition in comparison with the membrane bulk composition. The Pd70Ag30-based membranes display the largest permeation rates at temperatures below 200°C, while Pd membranes with 20Å 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. © 2001 Elsevier Science B.V. All rights reserved.
Place, publisher, year, edition, pages
2001. Vol. 193, no 1, 35-47 p.
Hydrogen, Oxygen, Palladium, Permeation, Silver
Engineering and Technology
IdentifiersURN: urn:nbn:se:liu:diva-47235DOI: 10.1016/S0376-7388(01)00414-8OAI: oai:DiVA.org:liu-47235DiVA: diva2:268131