Palladium-gold alloy membranes hydrogen

Palladium-Copper and Palladium-Gold Alloy Composite Membranes for Hydrogen Separations... 

Roa F, Thoen PM, Gade SK, Way JD, DeVoss SJ, Alptekin GO. Palladium-copper and palladium-gold alloy composite membranes for hydrogen separations. In Bose AC, editor. Inorganic membranes for energy and environmental applications. New York Springer Science and Business Media, LLC. 2009. p. 221-39. 

McKinley studied the effects of poisoning by H2S on membrane materials of pure palladium, and alloys of palladium with silver, nickel, copper and gold [74]. Only the Pd-Au alloys showed reasonable resistance to poisoning by hydrogen sulfide according to McKinley [74]. An alloy of 60 wt% Pd and 40 wt% Au retained 80% of its initial (unpoisoned) permeability upon exposure to 4 ppm H2S and retained 40% of its permeability during exposure to 20 ppm H2S at 623 K (350 °C). In contrast, pure palladium was poisoned to 30% of its initial, unpoisoned value after 6 days exposure to only 4 ppm H2S. An alloy of 73 wt% Pd and 27 wt% Ag was completely poisoned within hours after exposure to only 4 ppm... 

Gade SK, DeVoss SJ, Coulter KE, Pagheri SN, Alptekin GO, Way JD. Palladium-gold membranes in mixed gas streams with hydrogen sulfide effect of alloy content and fabrication technique. J Membr Sci 2011 378 35 1. 

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