Resumo (PT):
Abstract (EN):
Pd-Ag based membranes, self-supported and supported on porous α-Al2O3, have been studied for hydrogen
selective separation. In the case of the self-supported membranes the Pd-Ag permeator tube was prepared by
cold-rolling and diffusion welding technique; magnetron sputtering technique was employed for the synthesis of
the membrane supported on porous α-Al2O3. The results have shown that the self supported Pd-Ag membranes
are infinitively H2-selective and the H2-permeation rate through this membrane is in accordance with Sieverts´
law for detect-free meal membranes; hence, an ultra-pure hydrogen stream can be obtained. The Pd-Ag
membrane supported on porous α-Al2O3 is not completely selective towards H2, but requires much less metal
since it is much thinner (ca. ~50 vs. 1 µm).
In this work, it was studied the water-gas shift on Pd-Ag membrane reactor, but it was also illustrated another
application of palladium membranes, in the ethanol steam reforming. The use of the self-supported Pd-Ag
membrane leads to enhance the H2 yield in both reactions, providing much better performances than
conventional reactors.
Language:
English
Type (Professor's evaluation):
Scientific
No. of pages:
4