Hydrogen permeability and structure of vanadium alloy membranes

Sipatov, I. S.; Sidorov, N. I.; Pastukhov, E. A.; Gabis, I. E.; Piven, V. A.; Есин, А. А.; Pryanichnikov, S. V.; Vostryakov, A. A.

doi:10.1134/s096554411706010x

Cited by 10 publications

(4 citation statements)

References 15 publications

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“…Hydrogen bearing vanadium materials become brittle when the hydrogen concentration in metal exceeds 0.22 [hydrogen/metal (H/M)] . Thus, to reduce the solubility of hydrogen, substituting vanadium with other metals has been adopted to maintain the stability and performance of vanadium-based materials. , Nevertheless, in most studies, especially without a palladium coating, the pressure of hydrogen was set to pressure not greater than 10 kPa. , Dolan et. al.…”

Section: Introductionmentioning

confidence: 99%

“…5,6 Nevertheless, in most studies, especially without a palladium coating, the pressure of hydrogen was set to pressure not greater than 10 kPa. 7,8 Dolan et. al. showed that, other than alloying, temperature control can also prevent mechanical failure of vanadium-based alloys caused by the miscibility gap between vanadium hydride phases during the operation of a palladium-coated vanadium tubular membrane.…”

Section: Introductionmentioning

confidence: 99%

“… 5 , 6 Nevertheless, in most studies, especially without a palladium coating, the pressure of hydrogen was set to pressure not greater than 10 kPa. 7 , 8 Dolan et. al.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Gas for Thermal Treatment on Hydrogen Permeation in V–Ni Alloy Membranes

2023

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Hydrogen separation is an important step for the utilization of hydrogen energy. Metallic alloys, such as vanadium−nickel, are potential hydrogen separation materials. Due to the strong propensity of vanadium to form oxides and hydrides, vanadium alloy has a lower hydrogen permeability, and it is difficult to maintain the permeability over time. Therefore, special preparation processes such as Pd coating have been suggested for hydrogen separation vanadium-based membranes. However, aside from the prohibitive price of palladium, the interdiffusion of palladium and vanadium makes the coated membrane inviable to be used at a high temperature. Thermal treatment with inert gas was investigated in this study to assess the applicability of the vanadium alloy without palladium coating for hydrogen separation and clarify the mechanism behind the thermal treatment. Argon is inert with vanadium and displayed permeability recovery after 43 h thermal treatment, but the permeability declined under certain conditions. In contrast, nitrogen is known to interact with vanadium and the hydrogen permeability was maintained at a level lower than the test with argon. Given that nitrogen can compete with hydrogen for the active sites on vanadium, nitrogen might hinder hydrogen adsorption and hydride formation, whereas argon reduced the partial pressure of hydrogen during the thermal treatment, enhancing the driving force of hydrogen desorption. In the X-ray diffraction spectrum, vanadium hydrides and oxides were confirmed after hydrogen permeation and thermal treatment. In the X-ray photoelectron spectroscopy data, oxygen was a dominant element due to vanadium oxides and adsorbed nitrogen was also observed. According to binding energy shifts of nitrogen, nitrogen used for thermal treatment might substitute or compete for active sites with adsorbed nitrogen and hydrogen, existing in vanadium lattice. Although thermal treatment can be used to recover hydrogen permeability, the alloy cannot be recovered as hydrogen-free. However, results demonstrate the potential of thermal treatment to complement an uncoated vanadium alloy for a hydrogen separation membrane.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Gas for Thermal Treatment on Hydrogen Permeation in V–Ni Alloy Membranes

2023

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“…Hydrogen permeable membranes attract high interest in multiple technological and scientific areas. The search for an alternative to the Pd-based membranes, which involve elevated costs, has revealed vanadium and vanadium-based materials (and other elements from group V) as a promising choice, e.g., for hydrogen separation and purification technologies [1][2][3][4], the main aim being its use as fuel for the production of a carbon-free energy [5,6] or for tritium recycling and exhaust structures in the nuclear fusion field [7,8]. While there is a general agreement on diffusion and solubility values, a wide spread of permeability values is found in the literature [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Experimental Determination of Hydrogen Isotope Transport Parameters in Vanadium

et al. 2022

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Deuterium permeation through vanadium membranes in a wide range of pressures and the temperature range ~250–550 °C was experimentally investigated. Measurements on the same material were carried out in three laboratories with different features for an extended characterization and for cross-check validation. A unified equation for deuterium permeability in pure vanadium (99%) was provided as Ф = 1.27 ×10−4·e−8667/T mol m−1 s−1 Pa−0.5, which represents a significant progress for the characterization of the transport properties in this material, given the spread of data, which can currently be found in the literature. Adsorption and recombination rate constants were also measured for hydrogen and deuterium at low pressure for the same range of temperatures. Finally, the influence of the surface roughness was examined by measuring samples with different surface finish.

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