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Application of composite Pd based membranes represents a promising alternative for hydrogen purification. Here we propose the application of asymmetric alumina hollow fibres as a support for Pd deposition. Hollow fibres were sintered at different temperatures (1300 and 1400 o C). Characterisations of the substrate showed that it presents the desired morphological structure, with finger-voids extending to almost 90% of the fibre, high porosity and suitable mechanical strength. Hydrogen permeations through the composite membrane formed by the deposition of one palladium (Pd) layer on the alumina hollow fibre sintered at 1300 o C was on average 100% greater than using the hollow fibre sintered at 1400 o C. For 2 Pd layers, this difference decreased to 22%, showing that the substrate influence is more evident in thinner Pd membranes. The obtained H2 flux was equal to 0.80 μmol m -2 s -1 (at 450 o C and 180 kPa) and it is one of highest flux reported in the literature.

EFFECT OF SUBSTRATE RESISTANCE ON HYDROGEN PERMEANCE THROUGH Pd/Al2O3 COMPOSITE HOLLOW FIBRE MEMBRANES