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Composite palladium-ceramic membranes with palladium films ranging from 11.4 to 20 pm were made by depositing palladium on the inside surface of asymmetric tubular ceramic membranes. Electroless plating was used to deposit the palladium film. Membranes were characterized by conducting permeability experiments with hydrogen, nitrogen, and helium at temperatures from 723 to 913 K and feed pressures from 160 to 2445 kPa. The membranes had both a high hydrogen permeability and selectivity. The hydrogen permeability for a composite membrane with an 11.4pm palladium film was 3.23 X 10~9 mol-m/ (m2-s-Pa0-602) at 823 K. Hydrogen/nitrogen selectivity for this membrane was 380 at 823 K at a transmembrane pressure difference of 1500 kPa. Improvements in membrane sealing should further increase the hydrogen selectivity. Results of this study demonstrate the potential for using composite metal-ceramic membranes ip membrane reactors including applications that require operation at relatively high temperatures and transmembrane pressure differences. eters as low as 4 nm on the top (selective) layer are

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