Effects of CO and CO2 on hydrogen permeation through a ∼3μm Pd/Ag 23wt.% membrane employed in a microchannel membrane configuration

Mejdell, A.L.; Jondahl, Morten Hansen; Peters, Thijs; Bredesen, Rune; Venvik, Hilde J.

doi:10.1016/j.seppur.2009.04.025

Cited by 82 publications

(50 citation statements)

References 37 publications

(77 reference statements)

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“…In this figure is shown that the temperature effect on H 2 permeation (when in the presence of CO or CO 2 ) depends on the membrane type (Pd/Pd-alloy), thickness and preparation technique. For instance, in the works of Mejdell et al [16] and Gielens et al [17] were employed membranes prepared by magnetron sputtering (MS). In the former case, 5% CO in the feed (with a constant total feed pressure of 3 bar) caused the most drastic H 2 flux reduction, whereas in the latter, it is noteworthy that a feed with 20% of CO 2 at 673 K is responsible for the same decrease on H 2 flux as 5% of CO at 573 K for the membrane used in this work (w55%).…”

Section: Modelling By the Sievertselangmuir Equationmentioning

confidence: 99%

Effect of CO and CO2 on H2 permeation through finger-like Pd–Ag membranes

Miguel

Mendes

Tosti

et al. 2012

International Journal of Hydrogen Energy

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Section: Modelling By the Sievertselangmuir Equationmentioning

confidence: 99%

Effect of CO and CO2 on H2 permeation through finger-like Pd–Ag membranes

Miguel

Mendes

Tosti

et al. 2012

International Journal of Hydrogen Energy

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“…Li et al [12] observed CO 2 dissociation above 250 • C yielding molecularly and/or dissociatively adsorbed CO below 400 • C and nanoscopic carbon deposits above 450 • C. Mejdell et al [13] instead indicated that CO and CO 2 only inhibit surface reactivity of Pd-based membranes, and hence H 2 permeability, by formation of strongly adsorbed species. Nguyen et al [14] also concluded recently that the effect of CO is only that of competitive adsorption and is fully reversible.…”

Section: Introductionmentioning

confidence: 99%

The influence of the nanostructure on the effect of CO2 on the properties of Pd–Ag thin-film for H2 separation

Abate

Centi

et al. 2011

Applied Catalysis A: General

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Dedicated to the friend Helmut Knözinger on in the occasion of his 75 th birthday for the seminal contribution to the advancement of fundamental knowledge on catalysis. AbstractThe use of co-deposition instead of sequential deposition during the preparation of Pd-Ag thin films by electroless plating deposition leads to two different nanostructures, e.g. a dendritic nanostructure or a more compact and dense film, allowing to analyze the role of this parameter, at equal membrane composition, on the performances. In pure H2 the permeability to hydrogen of the second type of thin films is 3-4 times higher, but the presence of CO2 in the feed changes considerably the performances. The results are tentatively interpreted on the basis of a non-permanent in situ modification of the characteristics of the Pd-Ag thin films, with creation of strains and microholes particularly enhanced for the nanostructure present in the sample prepared by co-deposition. These strains and microholes are suggested to derive from the combined effect of CO2 (with creation of subsurface O and/or C) and of hydrogen diffusion through the thin film, which induces lattice expansion and stress on the nanograins. When the flux of H2 stops, there is a relatively rapid restoring of the initial situation. Scanning electron microscopy (SEM) characterization after the tests in the presence of CO2 indicates the presence of desintering consistently with above indications and the creation of crack like voids.

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“…Furthermore, the effects of CO and CO 2 on hydrogen permeation behavior through a w3-mm Pd/23 wt% Ag membrane employed in microchannel MMRs were investigated in detail (Mejdell, Jøndahl, et al, 2009b). Membrane permeance was 5.1 Â 10 À3 mol/m 2 s Pa 0.5 at 300 C under pure hydrogen.…”

Section: Planar Configurationmentioning

confidence: 99%