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Hydrogen permeation through surface modified Pd and PdAg membranes
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology.
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Applied Physics .
2001 (English)In: Journal of Membrane Science, ISSN 0376-7388, Vol. 193, no 1, 35-47 p.Article in journal (Refereed) Published
Abstract [en]

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.
Keyword [en]
Hydrogen, Oxygen, Palladium, Permeation, Silver
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-47235DOI: 10.1016/S0376-7388(01)00414-8OAI: oai:DiVA.org:liu-47235DiVA: diva2:268131
Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2011-01-13

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Ekedahl, Lars-GunnarDannetun, Helen

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