Hydrogen permeability of sulfur tolerant Pd–Cu alloy membranes

She, Ying; Emerson, Sean C.; Magdefrau, Neal J.; Opalka, Susanne M.; Thibaud‐Erkey, Catherine; Vanderspurt, Thomas H.

doi:10.1016/j.memsci.2013.09.025

Cited by 31 publications

(10 citation statements)

References 26 publications

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“…Although materials with a higher permeability than that of Pd are known (e.g., V, Nb, and Ta), expensive Pd and Pd‐based alloys remain the superior membrane materials owing to their favorable surface properties . Although it is well known that embrittlement can be limited by alloying Pd with elements such as Ag, Y, and Cu, the problem of contamination (e.g., competitive adsorption, coking, and sulfur poisoning) remains unsolved. For porous membranes, Pd is also commonly used as a catalytic, dense coating layer.…”

Section: Figurementioning

confidence: 99%

Promotion of Hydrogen Desorption from Palladium Surfaces by Fluoropolymer Coating

et al. 2016

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The catalytic activity of Pd surfaces towards hydrogen desorption was significantly improved by a nanometer‐thin polytetrafluoroethylene (PTFE) layer, as shown by an enhancement in the permeability of a Pd membrane coated on the permeate side. The origin of this effect was found to be due to a lowering of the barrier for hydrogen desorption, as evidenced by a change in the rate‐limiting mechanism of hydrogen permeation through the membrane from desorption (un‐coated) to diffusion controlled. In situ X‐ray photoelectron spectroscopy (XPS) revealed the electronic structure of the sputtered PTFE. Apart from C–Fn subunits (n=1, 2, 3), we found that nonsaturated carbon atoms became hydrogenated during hydrogen permeation, which was indicative of an interaction between Pd and PTFE. This interaction was weak; no Pd−F bonds were formed. We thus attributed the effect to an increase in the hydrophobicity of the surface by the porous PTFE layer and to a promoter effect of hydrogen desorption as a result of electrostatic interactions between chemisorbed hydrogen and physisorbed PTFE.

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Section: Figurementioning

confidence: 99%

Promotion of Hydrogen Desorption from Palladium Surfaces by Fluoropolymer Coating

et al. 2016

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“…In order to overcome these drawbacks, some studies proposed to change the crystal structure into nanostructure [19]. However, most of the researches proposed an enhancement of the membranes stability by alloying them with other elements [20,21,22]. Most efforts in this area are dedicated to Pd-Cu alloys because of their high resistance to sulfur poisoning [23,24,25].…”

Section: Introductionmentioning

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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“…However, some palladium-based alloys overcome at least one of these two major drawbacks of pure palladium. Palladium–copper alloys show, for instance, significant tolerance towards sulfur impurities, whereas palladium–silver alloys have lower phase-transition temperatures [11,13,16,17]. In addition, depending on the exact composition, palladium–copper and palladium–silver alloys have slightly higher hydrogen permeabilities than pure palladium, and alloying palladium with cheaper metals makes the membrane material, per mass, less expensive [11,13,14].…”

Section: Palladium Based Composite Membranes Via Suspension Plasmamentioning

confidence: 99%

Recent Developments in Compact Membrane Reactors with Hydrogen Separation

et al. 2018

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Hydrogen production and storage in small and medium scale, and chemical heat storage from renewable energy, are of great interest nowadays. Micro-membrane reactors for reforming of methane, as well as for the dehydrogenation of liquid organic hydrogen carriers (LOHCs), have been developed. The systems consist of stacked plates with integrated palladium (Pd) membranes. As an alternative to rolled and electroless plated (Pd) membranes, the development of a cost-effective method for the fabrication of Pd membranes by suspension plasma spraying is presented.

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Hydrogen permeability of sulfur tolerant Pd–Cu alloy membranes

Cited by 31 publications

References 26 publications

Promotion of Hydrogen Desorption from Palladium Surfaces by Fluoropolymer Coating

Promotion of Hydrogen Desorption from Palladium Surfaces by Fluoropolymer Coating

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

Recent Developments in Compact Membrane Reactors with Hydrogen Separation

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