Journal
ADVANCED MATERIALS
Volume 19, Issue 12, Pages 1636-+Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.200602637
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A novel composite membrane without continuous pores (see figure) with very high permeance for hydrogen is reported. The membrane is composed of a thin (30 nm) permselective silica layer deposited on a graded gamma-alumina multilayer substrate, consisting of size-controlled boehmite (AlOOH) sols deposited in order of decreasing size on a macroporous alumina support. A theory involving jumps of permeating molecules between adjacent solubility sites explains its behavior.
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