Influence of H2S on the hydrogen flux of thin-film PdAgAu membranes. (4th March 2020)

• Record Type: Journal Article
• Authors: de Nooijer, Niek; Sanchez, Julio Davalos; Melendez, Jon; Fernandez, Ekain; Pacheco Tanaka, David Alfredo; van Sint Annaland, Martin; Gallucci, Fausto
• Is Part Of: International journal of hydrogen energy. Volume 45:Number 12(2020)
• Page Start: 7303
• Page End: 7312
• Publication Date: 2020-03-04
• Subjects: H2S inhibition -- Palladium-based membrane -- Permeation -- Hydrogen production; Hydrogen as fuel -- Periodicals; Hydrogène (Combustible) -- Périodiques; Hydrogen as fuel; Periodicals; 665.81
• DOI: 10.1016/j.ijhydene.2019.06.194
• Languages: English
• ISSNs: 0360-3199

Abstract

Abstract: Pd-based membranes have the potential to be used for hydrogen purification and production in membrane reactors. However, the presence of impurities in the feedstock, such as H2 S can poison the membrane, thus decreasing the hydrogen permeation by blocking and deactivating active sites of the Pd-alloy on the membrane surface. H2 S at high concentrations can even destroy the membrane by the formation of Pd4 S. It is known that alloying of Pd with Au enhances the membrane resistance to H2 S. This work reports the performance of six PdAgAu/Al2 O3 supported membranes, prepared by electroless plating combined with PVD under exposure to trace amounts (<2 ppm) of H2 S. The Au content shows not to play a significant role at these low concentrations. Exposure results suggest a dual influence of physisorbed H2 S and chemisorbed S species. A Langmuir description shows that the influence of the partial pressure of hydrogen is negligible on the flux inhibition. In the post characterization the absence of Pd4 S was shown, however the surface was affected by the exposure to H2 S. Highlights: Six PdAgAu/Al2 O3 supported membranes were prepared by electroless plating and PVD. Different membranes were tested under exposure to trace amounts (<2 ppm) of H2 S. A Langmuir description shows that the influence of the partial pressure of hydrogen is negligible on the flux inhibition.