Premium
Defect‐free palladium membranes on porous stainless‐steel support
Author(s) -
Mardilovich Peter P.,
She Ying,
Ma Yi Hua,
Rei MinHon
Publication year - 1998
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.690440209
Subject(s) - membrane , knudsen number , hydrogen , porosity , palladium , recrystallization (geology) , diffusion , materials science , chemistry , helium , knudsen diffusion , analytical chemistry (journal) , chemical engineering , thermodynamics , composite material , chromatography , physics , paleontology , biochemistry , organic chemistry , biology , engineering , catalysis
Abstract Defect‐free Pd membranes were prepared by an electroless plating technique on porous stainless‐steel tubes. The effective surface of Pd membranes was up to 75 cm 2 . The helium flux was not detected at room temperature and pressure difference of 3 atm. At 350°C hydrogen permeances of up to \documentclass{article}\pagestyle{empty}\begin{document}$ 8\ m^3 /(m^2 \cdot \overrightarrow h \cdot atm^{0.5}) $\end{document} were obtained. A t a pressure difference of 1 atm and 350°C, selectivity coefficients as high as J(H 2 /JN 2 ) = 5,000 were observed. Fluxes of gases, impermeable through the Pd, were quantitatively described as a combination of Knudsen diffusion and viscous flow through the gaps created in the Pd layer at high temperatures. The stability of the prepared membranes at temperatures up to 700°C was investigated. The membranes were stable at 350°C over a period of 1,100 h, with no significant changes in the steady‐state hydrogen flux and with a recrystallization texture and aggregation of Pd grains.