Influence of steam and carbon dioxide on the hydrogen flux through thin Pd/Ag and Pd membranes

F.C. Gielens, R.J.J. Knibbeler, P. Duysinx, H.D. Tong, M.A.G. Vorstman, J.T.F. Keurentjes

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The influence of CO2 and steam on the H2 permeation behavior of high-flux Pd/Ag alloy and Pd membranes was studied. The membranes - fabricated with microsystem technol. - were 1.0 and 0.5 mm thick and the thin membranes reveal inhibitive effects better than the relatively thick membranes. The H2 flux through a membranes was studied for >80 h during and after addn. of CO2 or H2O to the feed. Measurements were carried out at 623, 673 and 723 K. The largest flux redns. were 70 and 69% at 623 K for H2O and CO2, resp. After terminating the steam addn. the H2 permeance restores to its original value. After terminating the CO2 addn. the H2 permeance increases, but to a value less than before the CO2 addn. Large time consts. were found for the transient permeance behavior. The inhibitive effect of CO2 is caused by the formation of CO and H2O by the reverse water gas shift reaction. Besides by adsorption of CO2, CO and H2O, a stronger inhibitive effect is caused by C, which is formed by the dissocn. of CO and CO2. [on SciFinder (R)]
Original languageEnglish
Pages (from-to)176-185
Number of pages10
JournalJournal of Membrane Science
Issue number1-2
Publication statusPublished - 2006


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