Inhibition of hydrogen flux in palladium membranes by pressure–induced restructuring of the membrane surface

Hydrogen transport through the V-Cr-Al alloys: Hydrogen solution, permeation and thermal-stability

“…8, which follows the variation tendency of the sticking coefficient in Ref. [37,38]. It is worth noting that a deviation of the dependency between × J d and P u 0.5 from the linear relationship was observed for membrane #2 and #3.…”

“…In addition to the high permeability and HE resistance, another essential property of metal membranes is the stability at elevated operating temperatures and pressures. Lundin et al [37] reported the depression of the hydrogen flux through Pd membranes at 623 K and 673 K, which was induced by the morphological changes of the Pd surface that affected its hydrogen absorption rate. Besides, the interdiffusion between the membrane and the porous stainless steel support was reported inducing permeability decline of Pd-Cu alloy membranes [38].…”

Versatile and Resistant Electroless Pore-Plated Pd-Membranes for H2-Separation: Morphology and Performance of Internal Layers in PSS Tubes

“…The incorporation of a H 2 -selective film onto the external surface of tubular porous supports prevails in the literature, probably intending to facilitate its morphological characterization through non-destructive techniques and avoid the membrane delamination produced in most applications where the permeated pure hydrogen is collected on the lumen side [ 19 , 20 ]. However, these membranes can also present diverse operating problems that limit their performance, especially in the case of working with complex gas mixtures [ 21 , 22 , 23 ] or fluidization conditions [ 24 , 25 ]. In this context, certain gases, such as carbon monoxide or steam, can inhibit the permeation process through the palladium film, especially above a certain concentration in the feed mixture [ 23 , 26 ], while fluidized catalyst particles could damage the palladium film by collisions, thus facilitating the generation of cracks and defects [ 24 , 27 ].…”

Thin robust Pd membranes for low-temperature application

“…[10][11][12][13] Several strategies have been developed to improve the stability, e.g., Pd nanoparticles packed inside the porous support to suppress the a to b phase transition, 14,15 and the formation of Pd-Ag, Pd-Cu or Pd/Y alloys. 16,17 The application of pure Pd membranes oen limits its operating temperature above 300 C. [18][19][20][21] There are two phases in the Pd-H system, the one with lower hydrogen content is called a-phase, and the hydrogen-rich phase is usually termed b-phase. When below the critical temperature about 293 C and at hydrogen pressure < 20 bar, the b-phase nucleates and grows in a-phase and this system is possible for the two phases to coexist.…”