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Synthesis of Pd-Ag Alloy Membranes and their Application in Membrane Reactors for Hydrogen Production and Purification

Title
Synthesis of Pd-Ag Alloy Membranes and their Application in Membrane Reactors for Hydrogen Production and Purification
Type
Article in International Conference Proceedings Book
Year
2012
Authors
Luís M. Madeira
(Author)
FEUP
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Patricia Pérez
(Author)
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Miguel A. Soria
(Author)
FEUP
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Ana I. Pereira
(Author)
Other
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Carlos J. Tavares
(Author)
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Adélio Mendes
(Author)
FEUP
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Silvano Tosti
(Author)
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Conference proceedings International
Pages: 29-32
Advances in Hydrogen Energy Technologies: Key to Sustainable Energy Markets, 5th International Seminar
Taguspark, Portugal, Nov. 29-30
Other information
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
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