Abstract
The hydrogen flux through the foil (thickness 30 μm) with the composition Pd–6.0 wt % In–0.5 wt % Ru in the temperature range from 593 to 823 K is studied. The permeability of Pd–In–Ru foil at 823 K is 3 times higher than the foil of the Pd–23 wt % Ag alloy. The H2 flux in the Pd–In–Ru foil is controlled by the diffusion of atomic hydrogen in the membrane bulk. The apparent activation energy of the hydrogen permeance is 18.7 kJ/mol. The influence of impurities (CO, N2, Ar) on the hydrogen flux is studied using both a sweep gas (N2) and transmembrane pressure. An insignificant negative effect of CO is observed in experiments using a sweep gas. When the transmembrane pressure is used, CO exerts a negative effect on the H2 flux, and this influence decreases with increasing temperature. The negative effect of CO decreases with the simultaneous use of transmembrane pressure and sweep gas. Contact of the foil with pure CO results in an insignificant formation of carbon deposits on the membrane surface, which exerts almost no effect on the H2 flux. No carbon deposits are formed on contact of the foil with the mixture H2–22.5% CO due to CO methanation with the formation of CH4 and H2O.
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