Influence of H2S on the hydrogen flux of thin-film PdAgAu membranes

Nooijer, Niek de; Sanchez, Julio Davalos; Meléndez, J.; Fernandez, Ekain; Tanaka, David A. Pacheco; Annaland, Martin van Sint; Gallucci, Fausto

doi:10.1016/j.ijhydene.2019.06.194

Cited by 20 publications

(4 citation statements)

References 36 publications

(47 reference statements)

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“…Such limitation can be minimised by fabricating the Pd alloy membranes with metals in group IB, IVB, VB and VIB of the periodic table. Peters et al [164] observed only 20%-30% loss in H 2 flux when exposing a Pd 77 Ag 23 membrane (thickness 10 µm) to 5 Â 10 -7 -0.002% (v/v) H 2 S/H 2 mixed gas for 265 h. Recent studies further demonstrated that the close to full recovery of H 2 flux through Pd alloy membranes were obtained when removing the H 2 S in the feed gas [164,165]. This suggested that the dominant interaction of H 2 S and alloy membranes was reversible adsorption rather than sulfidation reaction.…”

Section: Dense Metallic Membranesmentioning

confidence: 99%

“…Due to the special hydrogen transport mechanism, hydrogen permeation through dense metallic membranes is not affected by most of impurities except H 2 S. It was reported that H 2 S at concentrations~0.0002% (v/v) can react with conventional Pd and Pt membranes to form the metal sulphide on the membrane surface, which then completely inhibit the H 2 permeation through the membrane [63,164,165]. Such limitation can be minimised by fabricating the Pd alloy membranes with metals in group IB, IVB, VB and VIB of the periodic table.…”

Section: Dense Metallic Membranesmentioning

confidence: 99%

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The opportunity of membrane technology for hydrogen purification in the power to hydrogen (P2H) roadmap: a review

Miandoab

et al. 2020

Front. Chem. Sci. Eng.

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The global energy market is in a transition towards low carbon fuel systems to ensure the sustainable development of our society and economy. This can be achieved by converting the surplus renewable energy into hydrogen gas. The injection of hydrogen (⩽10% v/v) in the existing natural gas pipelines is demonstrated to have negligible effects on the pipelines and is a promising solution for hydrogen transportation and storage if the end-user purification technologies for hydrogen recovery from hydrogen enriched natural gas (HENG) are in place. In this review, promising membrane technologies for hydrogen separation is revisited and presented. Dense metallic membranes are highlighted with the ability of producing 99.9999999% (v/v) purity hydrogen product. However, high operating temperature (⩾300 °C) incurs high energy penalty, thus, limits its application to hydrogen purification in the power to hydrogen roadmap. Polymeric membranes are a promising candidate for hydrogen separation with its commercial readiness. However, further investigation in the enhancement of H 2 /CH 4 selectivity is crucial to improve the separation performance. The potential impacts of impurities in HENG on membrane performance are also discussed. The research and development outlook are presented, highlighting the essence of upscaling the membrane separation processes and the integration of membrane technology with pressure swing adsorption technology.

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Section: Dense Metallic Membranesmentioning

confidence: 99%

Section: Dense Metallic Membranesmentioning

confidence: 99%

The opportunity of membrane technology for hydrogen purification in the power to hydrogen (P2H) roadmap: a review

Miandoab

et al. 2020

Front. Chem. Sci. Eng.

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“…Many metals and metal alloys have been considered for hydrogen purification [16,17]; group V metals (such as Nb, Ta, V) and other metals such as Ni and Pd show a high hydrogen permeability, but they are also prone to hydrogen embrittlement. 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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“…Among all H 2 -selective membrane types, Pd-based membranes show an optimum match with the operating conditions typically targeted in a membrane-enhanced dehydrogenation process that is potentially operated between 300 and 500 °C [ 26 , 27 ]. One of the most investigated challenges for Pd-based membranes is that they are, to various degrees, prone to poisoning by for example CO and other surface co-adsorbates, leading to a reduced H 2 flux through coking [ 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 ]. Also in the case of dehydrogenation of light alkenes, it was observed that the obtained H 2 flux decreases over time [ 6 , 13 , 15 , 38 , 39 ].…”

Section: Introductionmentioning

confidence: 99%

Flux-Reducing Tendency of Pd-Based Membranes Employed in Butane Dehydrogenation Processes

2020

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We report on the effect of butane and butylene on hydrogen permeation through thin state-of-the-art Pd–Ag alloy membranes. A wide range of operating conditions, such as temperature (200–450 °C) and H2/butylene (or butane) ratio (0.5–3), on the flux-reducing tendency were investigated. In addition, the behavior of membrane performance during prolonged exposure to butylene was evaluated. In the presence of butane, the flux-reducing tendency was found to be limited up to the maximum temperature investigated, 450 °C. Compared to butane, the flux-reducing tendency in the presence of butylene was severe. At 400 °C and 20% butylene, the flux decreases by ~85% after 3 h of exposure but depends on temperature and the H2/butylene ratio. In terms of operating temperature, an optimal performance was found at 250–300 °C with respect to obtaining the highest absolute hydrogen flux in the presence of butylene. At lower temperatures, the competitive adsorption of butylene over hydrogen accounts for a large initial flux penalty.

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Influence of H2S on the hydrogen flux of thin-film PdAgAu membranes

Cited by 20 publications

References 36 publications

The opportunity of membrane technology for hydrogen purification in the power to hydrogen (P2H) roadmap: a review

The opportunity of membrane technology for hydrogen purification in the power to hydrogen (P2H) roadmap: a review

Promising Isotope Effect in Pd77Ag23 for Hydrogen Separation

Flux-Reducing Tendency of Pd-Based Membranes Employed in Butane Dehydrogenation Processes

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