Abstract
Abstract Investigations were made at 20°C on the permeation of He, H2, CO2, O2, Ar and N2, and the separation of an H2/N2 gas mixture through a high-flux asymmetric cellulose acetate (ACA) membrane metallized in vacuum with a 30 nm thick layer of Pd. It was found that to achieve high H2 permeation selectivity by metallization, the ultrathin ‘skin’ of the ACA membrane must be coated with a protective polymeric layer before the Pd deposition process. Eventually the composite membrane obtained exhibits high permeability and is up to 3.8 times more permeation-selective for H2 than the bare ACA membrane. The causes that determine modifications of the permeant gas fluxes and permeation selectivities of the membranes obtained during the successive preparation stages of the metallized ACA membranes are also discussed.
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