H2 permeation increase of electroless pore-plated Pd/PSS membranes with CeO2 intermediate barriers

Martinez-Diaz, D.; Sanz, R.; Calles, J.A.; Alique, D.

doi:10.1016/j.seppur.2019.01.076

Cited by 25 publications

(12 citation statements)

References 52 publications

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“…These raw supports had an external diameter of 0.5 inches and a wall thickness of around 1.9 mm. The original tubes were cut into small pieces 30 mm in length, cleaned, and calcined in air at 873 K for 12 h to generate a first intermediate layer that was formed by Fe-Cr oxides, as described in previous studies [ 28 ]. An additional CeO 2 -based intermediate layer was then incorporated using vacuum-assisted dip-coating to reduce both the average pore mouth size and external roughness of the support by a further grade [ 29 ].…”

Section: Methodsmentioning

confidence: 99%

Modeling of H2 Permeation through Electroless Pore-Plated Composite Pd Membranes Using Computational Fluid Dynamics

et al. 2021

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This work focused on the computational fluid dynamics (CFD) modeling of H2/N2 separation in a membrane permeator module containing a supported dense Pd-based membrane that was prepared using electroless pore-plating (ELP-PP). An easy-to-implement model was developed based on a source–sink pair formulation of the species transport and continuity equations. The model also included the Darcy–Forcheimer formulation for modeling the porous stainless steel (PSS) membrane support and Sieverts’ law for computing the H2 permeation flow through the dense palladium film. Two different reactor configurations were studied, which involved varying the hydrogen flow permeation direction (in–out or out–in). A wide range of experimental data was simulated by considering the impact of the operating conditions on the H2 separation, such as the feed pressure and the H2 concentration in the inlet stream. Simulations of the membrane permeator device showed an excellent agreement between the predicted and experimental data (measured as permeate and retentate flows and H2 separation). Molar fraction profiles inside the permeator device for both configurations showed that concentration polarization near the membrane surface was not a limit for the hydrogen permeation but could be useful information for membrane reactor design, as it showed the optimal length of the reactor.

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Section: Methodsmentioning

confidence: 99%

Modeling of H2 Permeation through Electroless Pore-Plated Composite Pd Membranes Using Computational Fluid Dynamics

et al. 2021

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“…Besides the morphology of the membranes, their permeation capacities with pure gases (H 2 , N 2 ) and their mixtures (N 2 content in the range 5%–40%) were also measured using a homemade facility, depicted in Figure 1 and used in previous studies [ 22 , 35 ].…”

Section: Methodsmentioning

confidence: 99%

“…Besides the morphology of the membranes, their permeation capacities with pure gases (H 2 , N 2 ) and their mixtures (N 2 content in the range 5%-40%) were also measured using a homemade facility, depicted in Figure 1 and used in previous studies [22,35]. In essence, the membrane was placed inside a 316L SS vessel rounded by an electrical furnace to operate in the range 350-450 • C. Two graphite O-rings were used to ensure good sealing of the membrane, maintaining both permeate and retentate streams completely separated during the complete set of experiments.…”

Section: Characterizationmentioning

confidence: 99%

“…One of the most frequent strategies is to consider a composite structure for the membrane, in which the palladium is deposited as a thin layer onto a porous substrate that provides the required mechanical resistance for the set [12,21]. However, more staked layers can also be generated to modify the original properties of the porous support [22,23] or protect the H 2 -selective film against certain molecules or particular operating conditions [24,25]. In those cases, the final mechanical properties of the system should be carefully addressed under operation because the possibility of a dramatic failure of the membrane noticeably increases with the number of stacked layers made of different materials.…”

Section: Introductionmentioning

confidence: 99%

“…Besides the intrinsic material compatibility of stacked layers in any composite membrane, the technology applied for the deposition of the top Pd film could also noticeably improve the mechanical resistance of the overall system. In the last years, a modification of the traditional electroless plating alternative in which the main reactants are separated by the wall of the porous support during the entire deposition process has exhibited very promising results in terms of Pd-thickness reduction and mechanical stability [ 17 , 22 , 30 ]. This alternative, denoted as electroless pore-plating (ELP-PP), has been satisfactorily applied onto both raw ceramic and metallic porous substrates or modified ones with different intermediate layers such as mixed iron–chromium oxides [ 31 ], ceria [ 22 ], or SBA-15 [ 32 ].…”

Section: Introductionmentioning

confidence: 99%

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Effective H2 Separation through Electroless Pore-Plated Pd Membranes Containing Graphite Lead Barriers

et al. 2020

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Hydrogen promotion as a clean energy vector could provide an efficient strategy for realizing real decarbonization of the current energy system. Purification steps are usually required in most H2-production processes, providing the use of Pd-based membranes, particularly those supported on porous stainless steel (PSS), important advantages against other alternatives. In this work, new composite membranes were prepared by modifying PSS supports with graphite, as an intermediate layer, before incorporating a palladium film by electroless pore-plating. Fully dense Pd layers were reached, with an estimated thickness of around 17 μm. Permeation measurements were carried out in two different modes: H2 permeation from the inner to the outer side of the membrane (in–out) and in the opposite way (out–in). H2 permeances between 3.24 × 10−4 and 4.33 × 10−4 mol m−2 s−1 Pa−0.5 with αH2/N2 ≥ 10,000 were reached at 350–450 °C when permeating from the outer to the inner surface. Despite a general linear trend between permeating H2 fluxes and pressures, the predicted intercept in (0,0) by the Sieverts’ law was missed due to the partial Pd infiltration inside the pores. H2-permeances progressively decreased up to around 33% for binary H2–N2 mixtures containing 40 vol% N2 due to concentration–polarization phenomena. Finally, the good performance of these membranes was maintained after reversing the direction of the permeate flux. This fact practically demonstrates an adequate mechanical resistance despite generating tensile stress on the Pd layer during operation, which is not accomplished in other Pd membranes.

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Advances in Pd Membranes for Hydrogen Production from Residual Biomass and Wastes

Maroño¹,

Alique

2020

Environmental Chemistry for a Sustainable World

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H2 permeation increase of electroless pore-plated Pd/PSS membranes with CeO2 intermediate barriers

Cited by 25 publications

References 52 publications

Modeling of H2 Permeation through Electroless Pore-Plated Composite Pd Membranes Using Computational Fluid Dynamics

Modeling of H2 Permeation through Electroless Pore-Plated Composite Pd Membranes Using Computational Fluid Dynamics

Effective H2 Separation through Electroless Pore-Plated Pd Membranes Containing Graphite Lead Barriers

Advances in Pd Membranes for Hydrogen Production from Residual Biomass and Wastes

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