Palladium composite membranes have been obtained by deposition of Pd on alumina-modified stainless steel supports. The preparation procedure involves deposition of a double layer of γ-alumina (γ-Al2O3) on the support by dip coating, followed by drying and calcination, activation of the modified support, deposition of palladium by electroless plating. SEM/EDS and Auger spectroscopy analysis, coupled with sputtering allowed the identification of critical issues and a proper re-elaboration of the preparation procedure. It has been found that γ-Al2O3 completely covers the support surface determining a significant reduction of surface rugosity. Activation, however, even if performed inside the γ-Al2O3 pH stability range, determines the partial dissolution of alumina; this phenomenon is enhanced while decreasing pH value. Moreover, Pd seeds, which catalyze subsequent Pd deposition, are not distributed evenly on the surface. As a consequence of the above observations, membrane preparation has been modified by introducing a pre-activation of the γ-Al2O3 external layer, consisting of the addition of palladium chloride to the alumina gel and palladium reduction in sodium boron hydride solution after calcination

Broglia, A., Pinacci, P., Radaelli, A., Bottino, A., Capannelli, G., Comite, A., et al. (2009). Synthesis and characterization of Pd membranes on alumina-modified porous stainless steel supports. DESALINATION, 245(1-3), 508-515 [10.1016/j.desal.2009.01.004].

Synthesis and characterization of Pd membranes on alumina-modified porous stainless steel supports

Vanacore, G;
2009

Abstract

Palladium composite membranes have been obtained by deposition of Pd on alumina-modified stainless steel supports. The preparation procedure involves deposition of a double layer of γ-alumina (γ-Al2O3) on the support by dip coating, followed by drying and calcination, activation of the modified support, deposition of palladium by electroless plating. SEM/EDS and Auger spectroscopy analysis, coupled with sputtering allowed the identification of critical issues and a proper re-elaboration of the preparation procedure. It has been found that γ-Al2O3 completely covers the support surface determining a significant reduction of surface rugosity. Activation, however, even if performed inside the γ-Al2O3 pH stability range, determines the partial dissolution of alumina; this phenomenon is enhanced while decreasing pH value. Moreover, Pd seeds, which catalyze subsequent Pd deposition, are not distributed evenly on the surface. As a consequence of the above observations, membrane preparation has been modified by introducing a pre-activation of the γ-Al2O3 external layer, consisting of the addition of palladium chloride to the alumina gel and palladium reduction in sodium boron hydride solution after calcination
Articolo in rivista - Articolo scientifico
Calcination; electroless plating; Sputtering; Surface rugosity;
English
2009
245
1-3
508
515
none
Broglia, A., Pinacci, P., Radaelli, A., Bottino, A., Capannelli, G., Comite, A., et al. (2009). Synthesis and characterization of Pd membranes on alumina-modified porous stainless steel supports. DESALINATION, 245(1-3), 508-515 [10.1016/j.desal.2009.01.004].
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/253513
Citazioni
  • Scopus 16
  • ???jsp.display-item.citation.isi??? 13
Social impact