TY - JOUR
T1 - Influence of steam and carbon dioxide on the hydrogen flux through thin Pd/Ag and Pd membranes
AU - Gielens, F.C.
AU - Knibbeler, R.J.J.
AU - Duysinx, P.
AU - Tong, H.D.
AU - Vorstman, M.A.G.
AU - Keurentjes, J.T.F.
PY - 2006
Y1 - 2006
N2 - The influence of CO2 and steam on the H2 permeation behavior of high-flux Pd/Ag alloy and Pd membranes was studied. The membranes - fabricated with microsystem technol. - were 1.0 and 0.5 mm thick and the thin membranes reveal inhibitive effects better than the relatively thick membranes. The H2 flux through a membranes was studied for >80 h during and after addn. of CO2 or H2O to the feed. Measurements were carried out at 623, 673 and 723 K. The largest flux redns. were 70 and 69% at 623 K for H2O and CO2, resp. After terminating the steam addn. the H2 permeance restores to its original value. After terminating the CO2 addn. the H2 permeance increases, but to a value less than before the CO2 addn. Large time consts. were found for the transient permeance behavior. The inhibitive effect of CO2 is caused by the formation of CO and H2O by the reverse water gas shift reaction. Besides by adsorption of CO2, CO and H2O, a stronger inhibitive effect is caused by C, which is formed by the dissocn. of CO and CO2. [on SciFinder (R)]
AB - The influence of CO2 and steam on the H2 permeation behavior of high-flux Pd/Ag alloy and Pd membranes was studied. The membranes - fabricated with microsystem technol. - were 1.0 and 0.5 mm thick and the thin membranes reveal inhibitive effects better than the relatively thick membranes. The H2 flux through a membranes was studied for >80 h during and after addn. of CO2 or H2O to the feed. Measurements were carried out at 623, 673 and 723 K. The largest flux redns. were 70 and 69% at 623 K for H2O and CO2, resp. After terminating the steam addn. the H2 permeance restores to its original value. After terminating the CO2 addn. the H2 permeance increases, but to a value less than before the CO2 addn. Large time consts. were found for the transient permeance behavior. The inhibitive effect of CO2 is caused by the formation of CO and H2O by the reverse water gas shift reaction. Besides by adsorption of CO2, CO and H2O, a stronger inhibitive effect is caused by C, which is formed by the dissocn. of CO and CO2. [on SciFinder (R)]
U2 - 10.1016/j.memsci.2005.12.002
DO - 10.1016/j.memsci.2005.12.002
M3 - Article
SN - 0376-7388
VL - 279
SP - 176
EP - 185
JO - Journal of Membrane Science
JF - Journal of Membrane Science
IS - 1-2
ER -