Abstract
Thin palladium composite membranes were prepared by modified electroless plating method on α-alumina supports and a dense Pd/α-Al 2O 3 composite membrane with high hydrogen flux, good selectivity for hydrogen was obtained. It was tested in a single gas permeation system for hydrogen permeance and hydrogen selectivity over nitrogen. The hydrogen permeance of the corresponding membrane was as high as 2.45 × 10 −6mol · m −2 · s −1 · Pa −1 and H 2/N 2 selectivity over 700 at 623K and a pressure difference of 0.1MPa. The main resistance of the composite membrane to H 2 permeation lies in the aluminum ceramic support rather than the thin Pd layer.
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