Hydrogen permeation through Pd–Ag membranes: Surface effects and Sieverts' law

Vadrucci, Monia; Borgognoni, Fabio; Moriani, Andrea; Santucci, Alessia; Tosti, Silvano

doi:10.1016/j.ijhydene.2013.01.091

Cited by 76 publications

(29 citation statements)

References 45 publications

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“…Actually, from the Sieverts' law the permeability should be independent of the total pressure, thus demonstrating that such a model is not effective to describe the permeation phenomena in the experienced pressure range (200-800 kPa). This effect is more noticeable for lower temperatures; similar results have been reported elsewhere [20].…”

Section: Pure Hydrogen Permeation Testssupporting

confidence: 91%

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Surface effects and CO/CO2 influence in the H2 permeation through a Pd–Ag membrane: A comprehensive model

Pérez

Cornaglia

Mendes

et al. 2015

International Journal of Hydrogen Energy

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The permeability of a 0.175 mm thick Pd-Ag tubular membrane to pure H2 and binary mixtures of H2/CO or H2/CO2 was studied. The tests were performed in a wide range of temperature (523-723 K) and pressure (200-800 kPa).Pure H2-permeation through a dense metal membrane is described by the Sieverts' law. However, it was already found that the H2 permeation does not follow the Sieverts' law when other components are present in the feed and namely CO or CO2. In this work, it is proposed a new permeation model based on the Sieverts' law considering: i) the mass transfer resistance due to the surface effects and ii) the barrier effect due to the presence of either CO or CO2. The model was successfully validated against experimental data of hydrogen permeation for binary (H2/CO and H2/CO2) experiments for every working temperature and pressure.

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Section: Pure Hydrogen Permeation Testssupporting

confidence: 91%

“…In this work, the values of Rs were taken as an average for ranges according to the literature for membranes of identical composition and similar thicknesses (ca. 200 m) [20,22] -see Table 2 where the calculated values of hydrogen permeability are also reported.…”

Section: Pure Hydrogen Permeation Testsmentioning

confidence: 99%

Surface effects and CO/CO2 influence in the H2 permeation through a Pd–Ag membrane: A comprehensive model

Pérez

Cornaglia

Mendes

et al. 2015

International Journal of Hydrogen Energy

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“…In order to take into account the pressure depletion due to hydrogen permeation, a code developed by ENEA Frascati research center has been used [37,38]. That model simulates both Pd-membrane and membrane reactors for tritium recovery in the applications of the fusion fuel cycle.…”

Section: Pd-ag Membranes Modellingmentioning

confidence: 99%

“…The membrane device (both Pd-Ag tube and shell module) is divided in finite elements; in each element, the mass balances are performed taking into account the permeation and reaction kinetics. In particular, the permeation of the hydrogen isotopes considers surface reactions together with the diffusion through the metal bulk [38]. The presence of surface reactions reduces the driving force of the permeation by reducing the hydrogen pressure upstream and increasing the hydrogen partial pressure downstream.…”

Section: Pd-ag Membranes Modellingmentioning

confidence: 99%

“…In general, it can be observed that the surface effects are negligible for this application because the J K a f ratio in (5) is two order of magnitude less than the hydrogen pressure. For example, considering a membrane thickness of 150 µm and a temperature of 623 K, it is possible to calculate the pressure drop by estimating the K af from literature [38]. The resulting value of J K a f is around 1 kPa; it is much lower Processes 2016, 4, 40 7 of 13 than p hf (18.9-189.0 kPa) and in the range of p hs (5 kPa).…”

Section: Pd-ag Membranes Modellingmentioning

confidence: 99%

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Design of a Multi-Tube Pd-Membrane Module for Tritium Recovery from He in DEMO

et al. 2016

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Abstract:Dense self-supported Pd-alloy membranes are used to selectively separate hydrogen and hydrogen isotopes. In particular, deuterium (D) and tritium (T) are currently identified as the main elements for the sustainability of the nuclear fusion reaction aimed at carbon free power generation. In the fusion nuclear reactors, a breeding blanket produces the tritium that is extracted and purified before being sent to the plasma chamber in order to sustain the fusion reaction. In this work, the application of Pd-alloy membranes has been tested for recovering tritium from a solid breeding blanket through a helium purge stream. Several simulations have been performed in order to optimize the design of a Pd-Ag multi-tube module in terms of geometry, operating parameters, and membrane module configuration (series vs. parallel). The results demonstrate that a pre-concentration stage before the Pd-membrane unit is mandatory because of the very low tritium concentration in the He which leaves the breeding blanket of the fusion reactor. The most suitable operating conditions could be reached by: (i) increasing the hydrogen partial pressure in the lumen side and (ii) decreasing the shell pressure. The preliminary design of a membrane unit has been carried out for the case of the DEMO fusion reactor: the optimized membrane module consists of an array of 182 Pd-Ag tubes of 500 mm length, 10 mm diameter, and 0.100 mm wall thickness (total active area of 2.85 m 2 ).

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Fuel Processing for Utilization in Fuel Cells

Peters

2016

Hydrogen Science and Engineering : Materials, Processes, Systems and Technology

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Hydrogen permeation through Pd–Ag membranes: Surface effects and Sieverts' law

Cited by 76 publications

References 45 publications

Surface effects and CO/CO2 influence in the H2 permeation through a Pd–Ag membrane: A comprehensive model

Surface effects and CO/CO2 influence in the H2 permeation through a Pd–Ag membrane: A comprehensive model

Design of a Multi-Tube Pd-Membrane Module for Tritium Recovery from He in DEMO

Fuel Processing for Utilization in Fuel Cells

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