Non-ideal hydrogen permeation through V-alloy membranes

Bellini, Stefano; Xiao, Liang; Li, Xinzhong; Gallucci, Fausto; Caravella, Alessio

doi:10.1016/j.memsci.2018.07.058

Cited by 11 publications

(5 citation statements)

References 35 publications

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“…V 85 Cr 10 Al exhibits lower hydrogen permeability than that of V 90 Cr 5 Al 5 , which is still higher than the reported value from Ref. [51]. This may result from the air treatment before the permeation test.…”

Section: Resultscontrasting

confidence: 56%

“…This step lasted 20 min until the surface of the disk lost the metallic luster and became dark. Then electroless plating in a special ethylene diamine tetraacetic acid (EDTA)-based solution was performed at 323 K. More details can be found in previous work [51].…”

Section: Sample Preparation and Microstructure Characterizationmentioning

confidence: 99%

“…The hydrogen permeable properties of the V 95 Cr 5 Al 5 and V 85 Cr 10 Al 5 membranes under pure hydrogen atmosphere were characterized using a gas permeation apparatus as in Ref. [51]. The membrane was sealed by copper gaskets during the permeation test.…”

Section: Hydrogen Solubility and Permeabilitymentioning

confidence: 99%

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

Huang

Shan

et al. 2020

Separation and Purification Technology

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Section: Resultscontrasting

confidence: 56%

Section: Sample Preparation and Microstructure Characterizationmentioning

confidence: 99%

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

Huang

Shan

et al. 2020

Separation and Purification Technology

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“…Vanadium in particular has interesting characteristics, showing the highest diffusivity and lowest solubility compared with other BCC metals [ 5 , 6 , 7 ] along with a relatively low cost. Moreover, the insertion of Ni-atoms into the V-lattice has been demonstrated to enhance the alloy properties in terms of mechanical resistance to the internal stress induced by the presence of hydrogen [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

Thermodynamic Aspects in Non-Ideal Metal Membranes for Hydrogen Purification

et al. 2018

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In this paper, an overview on thermodynamic aspects related to hydrogen-metal systems in non-ideal conditions is provided, aiming at systematically merging and analyzing information achieved from several different studies present in the open literature. In particular, the relationships among inner morphology, dissolved hydrogen and internal stresses are discussed in detail, putting in evidence the conformation complexity and the various types of dislocations induced by the presence of H-atoms in the lattice. Specifically, it is highlighted that the octahedral sites are preferentially occupied in the FCC metals (such as palladium), whereas tetrahedral sites are more energetically favored in BCC-structured ones (such as vanadium). These characteristics are shown to lead to a different macroscopic behavior of the two classes of metals, especially in terms of solubility and mechanical failure due to the consequent induced stresses. Furthermore, starting from the expression of the chemical potential generally presented in the literature, a new convenient expression of the activity of the H-atoms dissolved into the metal lattice as a function of the H-concentration is achieved. Such an activity expression is then used in the dissolution equilibrium relationship, which is shown to be the overall result of two different phenomena: (i) dissociative adsorption of molecular hydrogen onto the surface; and (ii) atomic hydrogen dissolution from the surface to the metal bulk. In this way, the obtained expression for equilibrium allows a method to calculate the equilibrium composition in non-ideal conditions (high pressure), which are of interest for real industrial applications.

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“…However, better mechanical properties can be achieved by alloying with other metals, such as Al [16], Fe, Cu [18], Au [19], Ru [20], etc., without affecting too much the overall permeability of the membranes. Among these materials, membranes based on Pd are the most mature technology [21,22].…”

Section: Introductionmentioning

confidence: 99%

Promising Isotope Effect in Pd77Ag23 for Hydrogen Separation

et al. 2021

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Pd–Ag alloys are largely used as hydrogen separation membranes and, as a consequence, the Pd–Ag–H system has been intensively studied. On the contrary, fewer information is available for the Pd–Ag–D system; thus, the aim of this work is to improve the knowledge of the isotope effect on the commercial Pd77Ag23 alloy, especially for temperature above 200 °C. In particular, deuterium absorption measurements are carried out in the Pd77Ag23 alloy in the temperature range between 79 and 400 °C and in the pressure range between 10−2 and 16 bar. In this exploited pressure (p) and composition (c) range, above 300 °C the pc isotherms display the typical shape of materials where only a solid solution of deuterium is present while at lower temperatures these curves seem to be better described by the coexistence of a solid solution and a deuteride in a large composition range. The obtained results are compared and discussed with the ones previously measured with the lightest hydrogen isotope. Such a comparison shows that the Pd77Ag23 alloy exhibits a clear inverse isotope effect, as the equilibrium pressure of the Pd–Ag–D system is higher than in Pd–Ag–H by a factor of ≈2 and the solubility of deuterium is about one half of that of hydrogen. In addition, the absorption measurements were used to assess the deuteration enthalpy that below 300 °C is ΔHdeut = 31.9 ± 0.3 kJ/mol, while for temperatures higher than 300 °C, ΔHdeut increases to 43 ± 1 kJ/mol. Additionally, in this case a comparison with the lighter isotope is given and both deuteration enthalpy values result lower than those reported for hydrogenation. The results described in this paper are of practical interest for applications operating above 200 °C, such as membranes or packing column, in which Pd77Ag23 has to interact with a gas stream containing both hydrogen isotopes.

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Non-ideal hydrogen permeation through V-alloy membranes

Cited by 11 publications

References 35 publications

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

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

Thermodynamic Aspects in Non-Ideal Metal Membranes for Hydrogen Purification

Promising Isotope Effect in Pd77Ag23 for Hydrogen Separation

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