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Free keywords:
Hydrogen separation; palladium membrane; carbon dioxide effect
Pd-Ag membranes
Abstract:
The effect of CO2 on the performances and stability of Pd-Ag membranes was investigated in relation to the membrane nanostructure comparing two different preparation methods, sequential and simultaneous electroless deposition. Both membranes shown the presence of dissociation to carbon and oxygen (deriving from CO2 in the feed) which slowly diffuse through the membrane influencing also the H2 permeability. The better performance in term of separation coefficient H2/CO2 and H2 permeability obtained using sequential deposition are attributed at the thinner and homogeneous film, with the absence of detectable grain boundaries, where the diffusion of the other species, C and O, probably took place.
