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High-temperature stability of palladium membranes on porous metal supports with different intermediate layers / Ke Zhang in Industrial & engineering chemistry research, Vol. 48 N°4 (Février 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - pp. 1880–1886 Titre : High-temperature stability of palladium membranes on porous metal supports with different intermediate layers Type de document : texte imprimé Auteurs : Ke Zhang, Auteur ; Huiyuan Gao, Auteur ; Zebao Rui, Auteur Année de publication : 2009 Article en page(s) : pp. 1880–1886 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Palladium  membranes  Porous  stainless  steel  Yttria  stabilized  zirconia Résumé : The effectiveness of intermediate layer to prevent intermetallic diffusion is a key factor for application of Pd membranes on porous stainless steel (PSS) support. In this work, electroless-plated Pd membranes were prepared on PSS disks with two different intermediate layers: in situ oxidized metal oxide and sol−gel derived mesoporous yttria stabilized zirconia (YSZ). A thinner, gastight Pd layer can be formed on PSS support with the YSZ intermediate layer, resulting in a higher hydrogen permeance than Pd membranes on PSS support with the in situ oxidized metal oxide intermediate layer. High temperature permeation and 100-h stability tests showed that both intermediate layers were effective as the diffusion barrier for Pd membranes on PSS supports in the temperature range of 773−873 K. At temperatures above 873 K, only the YSZ intermediate layer is effective in preventing intermetallic diffusion and gives a stable Pd membrane. At the elevated temperatures Pd membranes on PSS support with in situ oxidation layer suffer from a chemical and mechanical stability problem due to reduction of metal oxides in hydrogen atmosphere which results in intermetallic diffusion and possibly weakens the adhesion of the Pd layer on PSS support. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801417w [article] High-temperature stability of palladium membranes on porous metal supports with different intermediate layers [texte imprimé] / Ke Zhang, Auteur ; Huiyuan Gao, Auteur ; Zebao Rui, Auteur . - 2009 . - pp. 1880–1886. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N°4 (Février 2009) . - pp. 1880–1886 Mots-clés : Palladium  membranes  Porous  stainless  steel  Yttria  stabilized  zirconia Résumé : The effectiveness of intermediate layer to prevent intermetallic diffusion is a key factor for application of Pd membranes on porous stainless steel (PSS) support. In this work, electroless-plated Pd membranes were prepared on PSS disks with two different intermediate layers: in situ oxidized metal oxide and sol−gel derived mesoporous yttria stabilized zirconia (YSZ). A thinner, gastight Pd layer can be formed on PSS support with the YSZ intermediate layer, resulting in a higher hydrogen permeance than Pd membranes on PSS support with the in situ oxidized metal oxide intermediate layer. High temperature permeation and 100-h stability tests showed that both intermediate layers were effective as the diffusion barrier for Pd membranes on PSS supports in the temperature range of 773−873 K. At temperatures above 873 K, only the YSZ intermediate layer is effective in preventing intermetallic diffusion and gives a stable Pd membrane. At the elevated temperatures Pd membranes on PSS support with in situ oxidation layer suffer from a chemical and mechanical stability problem due to reduction of metal oxides in hydrogen atmosphere which results in intermetallic diffusion and possibly weakens the adhesion of the Pd layer on PSS support. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie801417w