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

Broglia, M.; Pinacci, P.; Radaelli, Marta; Bottino, A.; Capannelli, G.; Comite, Antonio; Vanacore, Giovanni Maria; Zani, Maurizio

doi:10.1016/j.desal.2009.01.004

Cited by 16 publications

(6 citation statements)

References 15 publications

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“…Different techniques can be adopted for depositing palladium or its alloys onto porous substrates such as magnetron sputtering [38], spray pyrolysis [39], chemical vapor deposition (CVD) [40], physical vapor deposition [39,41] and electroless plating deposition (ELP) [42,43]. In this study, a dense Pd-Au layer (~7 μm thick) was deposited onto a PSS tubular support via the ELP method.…”

Section: Methodsmentioning

confidence: 99%

Supported Pd-Au Membrane Reactor for Hydrogen Production: Membrane Preparation, Characterization and Testing

et al. 2016

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A supported Pd-Au (Au 7wt%) membrane was produced by electroless plating deposition. Permeation tests were performed with pure gas (H 2 , H 2 , N 2 , CO 2 , CH 4 ) for long time operation. After around 400 h under testing, the composite Pd-Au membrane achieved steady state condition, with an H 2 /N 2 ideal selectivity of around 500 at 420 °C and 50 kPa as transmembrane pressure, remaining stable up to 1100 h under operation. Afterwards, the membrane was allocated in a membrane reactor module for methane steam reforming reaction tests. As a preliminary application, at 420 °C, 300 kPa of reaction pressure, space velocity of 4100 h −1 , 40% methane conversion and 35% hydrogen recovery were reached using a commercial Ni/Al 2 O 3 catalyst. Unfortunately, a severe coke deposition affected irreversibly the composite membrane, determining the loss of the hydrogen permeation characteristics of the supported Pd-Au membrane.

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Section: Methodsmentioning

confidence: 99%

Supported Pd-Au Membrane Reactor for Hydrogen Production: Membrane Preparation, Characterization and Testing

et al. 2016

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“…Several methods have been developed for depositing a palladium layer onto porous substrates such as magnetron sputtering [ 25 ], spray pyrolysis [ 26 ], CVD [ 27 , 28 ], physical vapour deposition [ 29 ] and ELP [ 13 , 30 , 31 ]. In this work, ELP technique has been chosen for preparing both composite membranes owing to its important benefits such as the uniformity of the thin palladium layer, simplicity of the required equipment and low cost.…”

Section: Methodsmentioning

confidence: 99%

“…Numerous methods for depositing a thin Pd-layer onto porous supports have been investigated [ 25 , 26 , 27 , 28 , 29 , 30 , 31 ] and the technique most widely used is the electroless plating (ELP) owing to its various benefits [ 13 , 30 , 31 ]. Indeed, the hardness of the deposited layer and its strong adhesion to the support, the deposit uniformity on the complex geometry as well as the low preparation cost and the simplicity of the equipment and procedure can be considered as some of these benefits in the use of this technique [ 24 , 32 ].…”

Section: Introductionmentioning

confidence: 99%

Performance and Long-Term Stability of Pd/PSS and Pd/Al2O3 Membranes for Hydrogen Separation

et al. 2014

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The present work is focused on the investigation of the performance and long-term stability of two composite palladium membranes under different operating conditions. One membrane (Pd/porous stainless steel (PSS)) is characterized by a ~10 µm-thick palladium layer on a porous stainless steel substrate, which is pretreated by means of surface modification and oxidation; the other membrane (Pd/Al2O3) is constituted by a ~7 µm-thick palladium layer on an asymmetric microporous Al2O3 substrate. The operating temperature and pressure ranges, used for studying the performance of these two kinds of membranes, are 350–450 °C and 200–800 kPa, respectively. The H2 permeances and the H2/N2 selectivities of both membranes were investigated and compared with literature data. At 400 °C and 200 kPa as pressure difference, Pd/PSS and Pd/Al2O3 membranes exhibited an H2/N2 ideal selectivity equal to 11700 and 6200, respectively, showing stability for 600 h. Thereafter, H2/N2 selectivity of both membranes progressively decreased and after around 2000 h, dropped dramatically to 55 and 310 for the Pd/PSS and Pd/Al2O3 membranes, respectively. As evidenced by Scanning Electron Microscope (SEM) analyses, the pinholes appear on the whole surface of the Pd/PSS membrane and this is probably due to release of sulphur from the graphite seal rings.

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“…In this way, Yepes et al [ 128 ] and Li et al [ 129 ] decreased the original pore size of the metallic support by incorporating an alumina top layer that prevents possible inter-diffusion processes between the original support and the selective layer. Broglia et al [ 130 ] reported the incorporation process of γ-Al 2 O 3 particles by dip-coating onto a PSS support to achieve a totally defect-free Pd layer of around 11 μm. Chi et al [ 131 ] detailed the use of different graded alumina particles for a better modification of commercial PSS tubes.…”

Section: Membrane Supportsmentioning

confidence: 99%

Review of Supported Pd-Based Membranes Preparation by Electroless Plating for Ultra-Pure Hydrogen Production

et al. 2018

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In the last years, hydrogen has been considered as a promising energy vector for the oncoming modification of the current energy sector, mainly based on fossil fuels. Hydrogen can be produced from water with no significant pollutant emissions but in the nearest future its production from different hydrocarbon raw materials by thermochemical processes seems to be more feasible. In any case, a mixture of gaseous compounds containing hydrogen is produced, so a further purification step is needed to purify the hydrogen up to required levels accordingly to the final application, i.e., PEM fuel cells. In this mean, membrane technology is one of the available separation options, providing an efficient solution at reasonable cost. Particularly, dense palladium-based membranes have been proposed as an ideal chance in hydrogen purification due to the nearly complete hydrogen selectivity (ideally 100%), high thermal stability and mechanical resistance. Moreover, these membranes can be used in a membrane reactor, offering the possibility to combine both the chemical reaction for hydrogen production and the purification step in a unique device. There are many papers in the literature regarding the preparation of Pd-based membranes, trying to improve the properties of these materials in terms of permeability, thermal and mechanical resistance, poisoning and cost-efficiency. In this review, the most relevant advances in the preparation of supported Pd-based membranes for hydrogen production in recent years are presented. The work is mainly focused in the incorporation of the hydrogen selective layer (palladium or palladium-based alloy) by the electroless plating, since it is one of the most promising alternatives for a real industrial application of these membranes. The information is organized in different sections including: (i) a general introduction; (ii) raw commercial and modified membrane supports; (iii) metal deposition insights by electroless-plating; (iv) trends in preparation of Pd-based alloys, and, finally; (v) some essential concluding remarks in addition to futures perspectives.

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

Cited by 16 publications

References 15 publications

Supported Pd-Au Membrane Reactor for Hydrogen Production: Membrane Preparation, Characterization and Testing

Supported Pd-Au Membrane Reactor for Hydrogen Production: Membrane Preparation, Characterization and Testing

Performance and Long-Term Stability of Pd/PSS and Pd/Al2O3 Membranes for Hydrogen Separation

Review of Supported Pd-Based Membranes Preparation by Electroless Plating for Ultra-Pure Hydrogen Production

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