INVESTIGADORES
CORNAGLIA Laura Maria
artículos
Título:
Novel PdAgCu ternary alloy: Hydrogen permeation and surface properties
Autor/es:
A. TARDITI, F. BRAUN, L. M. CORNAGLIA
Revista:
APPLIED SURFACE SCIENCE
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Año: 2011 vol. 257 p. 6626 - 6635
ISSN:
0169-4332
Resumen:
Dense
PdAgCu ternary alloy composite membranes were synthesized by the sequential
electroless plating of Pd, Ag and Cu on top of both disk and tubular porous
stainless steel substrates. X-ray diffraction and scanning electron microscopy
were employed to study the structure and morphology of the tested samples. The
hydrogen permeation performance of these membranes was investigated over a 350
450 oC temperature range and a trans-membrane pressure up to 100
kPa. After annealing at 500 oC
in hydrogen stream followed by permeation experiments, the alloy layer
presented a FCC crystalline phase with a bulk concentration of 68% Pd, 7% Ag
and 25% Cu as revealed by EDS. The PdAgCu tubular membrane was found to be
stable during more than 300 hours on hydrogen stream. The permeabilities of the
PdAgCu ternary alloy samples were higher than the permeabilities of the PdCu
alloy membranes with a FCC phase. The Co-segregation of silver and copper to
the membrane surface was observed after hydrogen permeation experiments at high
temperature as determined by XPS