Cerca nel sito per parola chiave

pubblicazioni - Articolo

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

pubblicazioni - Articolo

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

Background Palladium alloy membranes are widely studied for CO2 capture and hydrogen separation from synthesis gas in membrane reactors. Due to the considerable cost of palladium, efforts have been made to obtain low thickness deposits on cheaper materials, such as macro-porous metals, by various techniques, including electroless plating [1, 2]. However, high operating temperatures (>350-400°C) and long exposure times can determine the diffusion of substrate metals (e.g. iron) into the palladium layer and, subsequently, a significant decrease of hydrogen permeance and selectivity.

To avoid this problem, the support should be modified, introducing a suitable barrier layer. Candidate materials for this purpose include ceramics such as alumina and alumina alloys [3]. This paper focuses on the preparation and charaterization of palladium composite membranes obtained by deposition of Pd by electroless plating on alumina modified stainless steel supports. Conclusions Palladium composite membranes have been obtained by deposition of Pd by electroless plating on alumina modified stainless steel supports. SEM/EDS and Auger spectroscopy analysis allowed the identification of critical issues and a proper re-elaboration of preparation procedure.

Progetti

Commenti