New synthesis method of Pd membranes over tubular PSS supports via “pore-plating” for hydrogen separation processes

Sanz, R.; Calles, J.A.; Alique, D.; Furones, Laura

doi:10.1016/j.ijhydene.2012.09.084

Cited by 40 publications

(30 citation statements)

References 28 publications

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“…As it can be seen, independently of the commercial media grade, an apparent continuous layer of palladium was formed onto the modified supports. This fact, thoroughly discussed in our previous manuscripts [18,53], is mainly caused by the wide variety of pore sizes in the PSS supports, in spite of being modified by in-situ oxidation at high temperature for the generation of a Fe-Cr mixed oxides intermediate layer.…”

Section: Palladium Composite Membrane Preparationmentioning

confidence: 92%

“…The general procedure to prepare the composite PSS-Pd membranes involves four successive steps, as we already published in detail elsewhere [18,23,53,54]: (i) initial cleaning with a sequence of acidic, alkaline and alcohol solutions in ultrasonic; (ii) intermediate layer generation; (iii) activation of the modified support and (iv) final palladium incorporation. This work is mainly focused in the second step, based on the generation of the mixed iron-chromium oxides intermediate layer formed by in-situ oxidation of commercial raw supports in air.…”

Section: Membrane Preparationmentioning

confidence: 99%

“…Furthermore, the permeation behavior of fabricated membranes was also determined in a home-made permeator device described elsewhere [39,53]. In summary, each sample (raw material, modified support or final palladium composite membrane) was placed in a stainless-steel cell, ensuring the correct sealing with graphite O-rings.…”

Section: Membrane Characterizationmentioning

confidence: 99%

“…More details about this technique, including details of bath composition, temperature and duration of the process, can be consulted in our previous publications [18,20,53,54].…”

Section: Palladium Composite Membrane Preparationmentioning

confidence: 99%

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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: Palladium Composite Membrane Preparationmentioning

confidence: 92%

Section: Membrane Preparationmentioning

confidence: 99%

Section: Membrane Characterizationmentioning

confidence: 99%

“…More details about this technique, including details of bath composition, temperature and duration of the process, can be consulted in our previous publications [18,20,53,54].…”

Section: Palladium Composite Membrane Preparationmentioning

confidence: 99%

See 2 more Smart Citations

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

Furones

Alique

2017

ChemEngineering

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show abstract

“…A thin and dense palladium layer around the external surface of the support and the filling of the nearest pores was observed, obtaining an infinite hydrogen selectivity and good stability under thermal cycles [19,20].…”

Section: Introductionmentioning

confidence: 99%

Hydrogen production in a Pore-Plated Pd-membrane reactor: Experimental analysis and model validation for the Water Gas Shift reaction

Sanz

Calles

Alique

et al. 2015

International Journal of Hydrogen Energy

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Design of metallic nickel hollow fiber membrane modules for pure hydrogen separation

Zhang

Chu

et al. 2018

AIChE Journal

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Cost‐effective and robust nickel (Ni) membrane for H2 separation is a promising technology to upgrade the conventional H2 industries with improved economics and environmental benignity. In this work, Ni hollow fibers (HFs) with one closed end were fabricated and assembled into a membrane module for pure H2 separation by applying vacuum to the permeate side. The separation behavior of the HF module was investigated both experimentally and theoretically. Results indicate that H2 recovery can be improved significantly by changing the operation conditions (temperature or feed pressure). Ni HF is a promising membrane geometry, but the negative effect of pressure drop when H2 passes through the lumen cannot be ignored. Under the vacuum operation mode, there is little difference in term of H2 recovery efficiency whether the feed gas flow is controlled in countercurrent or recurrent operation. This work provides important insight to the development of superior membrane H2 separation system. © 2018 American Institute of Chemical Engineers AIChE J, 64: 3662–3670, 2018

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New synthesis method of Pd membranes over tubular PSS supports via “pore-plating” for hydrogen separation processes

Cited by 40 publications

References 28 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

Hydrogen production in a Pore-Plated Pd-membrane reactor: Experimental analysis and model validation for the Water Gas Shift reaction

Design of metallic nickel hollow fiber membrane modules for pure hydrogen separation

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