Y. Sakamoto et al., EFFECT OF CARBON NONOXIDE ON HYDROGEN PERMEATION IN SOME PALLADIUM-BASED ALLOY MEMBRANES, International journal of hydrogen energy, 21(11-12), 1996, pp. 1017-1024
Citations number
21
Categorie Soggetti
Energy & Fuels","Environmental Sciences","Physics, Atomic, Molecular & Chemical
The effect of poisoning by carbon monoxide in hydrogen gas on hydrogen
permeation through Pd-rich Pd-Y(Gd)-Ag and Pd-Y-In(Sn,Pb) alloy serie
s has been investigated. The hydrogen permeability in all the alloys d
ecreases with time due to the adsorption of the contaminant gas on the
surfaces. In particular, the reduction in permeability For high Y(Gd)
content Pd-Y(Gd)-Ag alloys, which have higher permeability under pure
H-2 gas, is larger than that in the Pd-Y-In(Sn,Pb) alloys series. The
reduction rates for the Pd-Cid-Ag alloy series decrease with increasi
ng temperature, whereas for the Pd-Y-Ag alloy series and also Pd-24.0
at. % Ag alloy the reduction rates increase with temperature. The XPS
analysis on the alloy surfaces before and after the permeation experim
ents showed no carbides or oxides. The intensities of C-1s spectrum fo
r all the alloys decrease with increase of Ar+ sputter etching time. T
he reduction in hydrogen permeability for these alloys can be attribut
ed to the decrease in effective area for dissociation of hydrogen mole
cules due to the adsorption of CO on the alloy surfaces. Copyright 199
6 International Association for Hydrogen Energy