Comprehensive permeation analysis and mechanical resistance of electroless pore-plated Pd-membranes with ordered mesoporous ceria as intermediate layer

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

“…However, this could not only be attributed to the dilution effect because the diverse N2 contents caused a variation of the H2 permeance despite considering the hydrogen partial pressures when calculating the pressure driving force used in Sieverts' law. Therefore, some possible contribution of concentration polarization seems to be present, as previously suggested in [29]. In any case, this behavior is coherent with the H2 permeance values reached under both conditions, with them being around 2.5 times higher in the case of feeding H2 concentrate mixtures instead of the diluted one.…”

“…This fact was taken into account in the modeling to explain certain differences reached while permeating from the outer to the inner surface or vice versa. Further details about the morphology of this kind of membrane can be found elsewhere [ 29 ].…”

“…In all cases, a slight deviation from the origin was observed when trying to fit the experimental data to the Sieverts’ law due to the above-mentioned partial infiltration of palladium into the pores of the substrate. A detailed explanation of the permeation behavior of this membrane can be found in our previous manuscript, where this ELP-PP membrane was presented for the first time [ 29 ]. Here, a brief summary of the most relevant parameters to be considered in the modeling is included.…”

“…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 ]. Finally, ELP-PP of the palladium was used to generate the H 2 -selective film, as reported in previous publications [ 30 , 31 ].…”

“…The basic morphology of these composite Pd membranes was analyzed via SEM analysis, including both surface and cross-sectional views. Moreover, a series of gas permeation experiments were carried out to determine both the permeability and H 2 selectivity of the prepared membranes in a homemade device that was described in our previous publications [ 28 , 29 ]. A 316L SS cell rounded using an external electrical furnace contained the Pd membrane in the middle of two graphite O-rings to ensure an adequate sealing between both the retentate and permeate sides.…”