Thin palladium layer deposited on ceramic materials: application in hydrogen transport and catalytic membrane process.
Fiche publication
Date publication
janvier 2008
Auteurs
Membres identifiés du Cancéropôle Est :
Dr ERNST Barbara
Tous les auteurs :
Haag S, Burgard M, Amer J, Ernst B
Lien Pubmed
Résumé
The objective of this work was to develop a thin, highly permeable, composite inorganic membrane based on palladium supported on a porous ceramic for high temperature hydrogen separation. The palladium layer (1-2 mu m thick) was deposited by electroless plating on an asymmetric tubular alumina support. High temperature hydrogen permeation tests were done showing interesting hydrogen permselectivity properties with a H(2)/N(2) separation factor at 60 (400 degrees C) with a trans-membrane pressure difference of I bar. The transport of the hydrogen through the Pd membrane is mixed, solution-diffusion through the metal bulk and surface diffusion/Knudsen diffusion through the pores/defects of the film. As predicted, the membrane reactor for the dry reforming of methane shifts the equilibrium of the reaction in the direction of a higher hydrogen production. An enhancement of the methane conversion of 18% was observed in the membrane reactor configuration due to the selective removal of the hydrogen during the reaction as well as a limitation of side reactions.
Référence
Int J Surf Sci Eng. 2008;2(3-4):202-21.