Effect of hydrogen-sulfide on the hydrogen permeance of palladium?copper alloys at elevated temperatures

• DOI: 10.1016/j.memsci.2004.04.033
• Publication Date: 2004-07-23T14:54:10Z
• Authors: B MORREALE
• Keywords: 02 engineering and technology; 0210 nano-technology

Abstract The hydrogen permeance of several 0.1 mm thick Pd–Cu alloy foils (80 wt.% Pd–20 wt.% Cu, 60 wt.% Pd–40 wt.% Cu and 53 wt.% Pd–47 wt.% Cu) was evaluated using transient flux measurements at temperatures ranging from 603 to 1123 K and pressures up to 620 kPa both in the presence and absence of 1000 ppm H 2 S. Sulfur resistance, as evidenced by no significant change in permeance, was correlated with the temperatures associated with the face-centered-cubic crystalline structure for the alloys in this study. The permeance of the body-centered cubic phase, however, was up to two orders of magnitude lower when exposed to H 2 S. A smooth transition from sulfur poisoning to sulfur resistance with increasing temperature was correlated with the alloy transition from a body-centered-cubic structure to a face-centered-cubic structure.