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TitleDeposition of Pd–Ag thin film membranes on ceramic supports for hydrogen purification/separation
Author(s)Pereira, Ana Isabel
Pérez, P.
Rodrigues, S. C.
Mendes, A.
Madeira, L. M.
Tavares, C. J.
KeywordsThin films
Sol–gel chemistry
Electron microscopy
Surface properties
Catalytic properties
A. Thin films
B. Sol-gel chemistry
B. Sputtering
C. Electron microscopy
D. Catalytic properties
D. Diffusion
D. Surface properties
Issue date2015
JournalMaterials research bulletin
CitationPereira, A. I., Pérez, P., Rodrigues, S. C., Mendes, A., Madeira, L. M., & Tavares, C. J. (2015). Deposition of Pd-Ag thin film membranes on ceramic supports for hydrogen purification/separation. Materials Research Bulletin, 61, 528-533. doi: 10.1016/j.materresbull.2014.10.055
Abstract(s)Pd–Ag based membranes supported on porous a-Al2O3 (doped with yttria-stabilized zirconia) were studied for hydrogen selective separation. Magnetron sputtering technique was employed for the synthesis of thin film membranes. The hydrogen permeation flux is affected by the membrane columnar structure, which is formed during deposition. From scanning electron microscopy analysis, it was observed that different sputtering deposition pressures lead to distinct columnar structure growth. X-ray diffraction patterns provided evidence of a Pd–Ag solid solution with an average crystallite domain size of 21 nm, whose preferential growth can be altered by the deposition pressure. The gas-permeation results have shown that the Pd–Ag membrane supported on porous a-Al2O3 is selective toward H2. For optimized membrane synthesis conditions, the permeance toward N2 is 0.076 10 6 mol m 2 s 1 Pa 1 at room temperature, whereas for a pressure difference of 300 kPa the H2-flux is of the order of ca. 0.21 mol m 2 s 1, which corresponds to a permeance of 0.71 10 6 mol m 2 s 1 Pa 1, yielding a selectivity of a (H2/N2) = 10. These findings suggest that the membrane has a reasonable capacity to selectively permeate this gas.
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Appears in Collections:CDF - GRF - Artigos/Papers (with refereeing)

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