Pd-thickness reduction in electroless pore-plated membranes by using doped-ceria as interlayer

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

doi:10.1016/j.ijhydene.2019.10.140

Cited by 19 publications

(12 citation statements)

References 49 publications

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“…Based on these results evidencing a homogeneous deposition of the palladium around the external surface of modified supports, the palladium thickness can be directly estimated as a uniform outer layer from gravimetric measurements. This value, denoted in the present work as t Pd e , was around 17 μm, which is close to other values obtained when using the ELP-PP procedure to synthesize Pd membranes with intermediate layers such as CeO 2 [ 35 ] or SBA-15 [ 32 ].…”

Section: Resultssupporting

confidence: 89%

“…Despite the preferential incorporation of the palladium particles just inside the pores of the support or their surrounding areas when using the ELP-PP alternative, in this case, a continuous Pd film that covers the entire surface of the modified supports with graphite can be observed by both SE (secondary electrons) and BSE (back-scattering electrons) images. This morphology, with a spherical grain growth of palladium deposits (Figure 3a), is certainly similar to the ones reached for other ELP-PP membranes in which diverse ceramic intermediate layers were used [32,35]. It can be explained by the presence of a certain pore size distribution in the porous substrates due to the irregularity of the SS grains and the graphite particles.…”

Section: Membrane Morphologysupporting

confidence: 82%

“…Finally, substrate activation with both Pd nuclei and Pd deposition was carried out based on the well-established electroless pore-plating alternative [ 12 , 17 , 33 ]. Accordingly, the solutions containing the Pd source and the reducing agent were fed from opposite sides of the support with the aim that they will be present and reactive just in the pores or surrounding areas [ 30 , 34 , 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 ].…”

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%

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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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Section: Resultssupporting

confidence: 89%

Section: Membrane Morphologysupporting

confidence: 82%