NaA zeolite as an effective diffusion barrier in composite Pd/PSS membranes

Bosko, María Laura; Ojeda, Fabiana Soledad; Lombardo, E.A.; Cornaglia, Laura María

doi:10.1016/j.memsci.2009.01.005

Cited by 72 publications

(27 citation statements)

References 27 publications

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“…The incorporation of an additional intermediate layer is one of the most popular alternatives to overcome these problems [34][35][36] and, additionally, it is able to prevent metal interdiffusion processes that could cause a drastic permeation drop when operating at high temperatures [37]. A wide variety of materials has been proposed to be used as intermediate layers, including silica [38,39], ceria [40][41][42], zirconia [22,33,43,44] and micron-sized nickel and alumina slurries [45], among others [37,[46][47][48][49]. In most cases, the calcination of the composite system is required in order to obtain the final structure of these materials [40,43] and, consequently, partial oxidation of the support is also produced.…”

Section: Introductionmentioning

confidence: 99%

Interlayer Properties of In-Situ Oxidized Porous Stainless Steel for Preparation of Composite Pd Membranes

Furones

Alique

2017

ChemEngineering

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Abstract:Hydrogen is considered as a real alternative for improving the current energy scenario in the near future and separation processes are a crucial step for the economy of the process in both centralized and distributed production systems. In this context, Pd-based composite membranes appear as an attractive technology trying to reduce the Pd thickness by modifying the commercial supports, mainly formed by metals to fit properly in conventional industrial devices. In most cases, a final calcination step is required and hence, the metallic support can be oxidized. This work analyzes in detail the properties of intermediate layers generated by in-situ oxidation of tubular PSS supports as a crucial step for the preparation of Pd/PSS membranes. The oxidation temperature determines the modification of original morphology and permeability by increasing the presence of mixed iron-chromium oxides as temperature rises. A compromise solution need to be adopted in order to reduce the average pore mouth size and the external roughness, while maintaining a high permeation capacity. Temperature of 600 • C lets to reduce the average pore size from 3.5 to 2.1 µm or from 4.5 to 2.3 µm in case of using PSS supports with 0.1 or 0.2 µm porous media grades, respectively but maintaining a hydrogen permeation beyond targets of United States of America Department of Energy (US DOE). Lower temperatures provoke an insufficient surface modification, while greater values derive in a drastic reduction of permeability. In these conditions, two composite membranes were prepared by ELP-PP, obtaining 14.7 and 18.0 µm thick palladium layers in case of modifying PSS tubes of 0.1 or 0.2 µm media grades, respectively. In both cases, the composite Pd membranes exhibited a hydrogen perm-selectivity greater than 2000 with permeances ranged from 2.83 to 5.84·10 −4 mol m −2 s −1 Pa −0.5 and activation energies of around 13-14 kJ mol −1 .

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Section: Introductionmentioning

confidence: 99%

Interlayer Properties of In-Situ Oxidized Porous Stainless Steel for Preparation of Composite Pd Membranes

Furones

Alique

2017

ChemEngineering

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“…The recent work of Bosko and coworkers [40] employed a zeolite layer of NaA as a diffusion barrier between the palladium membrane and stainless steel support. The molecular-sized pores of zeolites prevent the interdiffusion of materials between the Pd membrane and support.…”

Section: Introductionmentioning

confidence: 99%

A novel approach for the preparation of highly stable Pd membrane on macroporous α-Al2O3 tube

Zhang

Deng

et al. 2010

Journal of Membrane Science

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“…The seeding layer was coated on the outer surface of the oxidized support by the vacuum-assisted seeding method using an ejector water jet pump, which was used to generate a pressure difference between the two sides of the support walls [19]. The tube connected to a vacuum system was fixed vertically and twice immersed for 3 min in a cylindrical vessel containing a colloidal suspension.…”

Section: Modified Supportmentioning

confidence: 99%

Dry reforming of methane in membrane reactors using Pd and Pd–Ag composite membranes on a NaA zeolite modified porous stainless steel support

Bosko

Múnera

Lombardo

et al. 2010

Journal of Membrane Science

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NaA zeolite as an effective diffusion barrier in composite Pd/PSS membranes

Cited by 72 publications

References 27 publications

Interlayer Properties of In-Situ Oxidized Porous Stainless Steel for Preparation of Composite Pd Membranes

Interlayer Properties of In-Situ Oxidized Porous Stainless Steel for Preparation of Composite Pd Membranes

A novel approach for the preparation of highly stable Pd membrane on macroporous α-Al2O3 tube

Dry reforming of methane in membrane reactors using Pd and Pd–Ag composite membranes on a NaA zeolite modified porous stainless steel support

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