Permeability hydrogen

Barth, C. F., Steigerwaid, E. A. and Troiano, A. R., Hydrogen Permeability and Delayed Failure of Polarised Martensitic Steels , Corrosion, 25, 353 (1969)... 

Hydrogen permeability of various metals. (Based on data from Steward, S.A., Review of Hydrogen Isotope Permeability through Materials, Lawrence Livermore National Laboratory Report, UCRL-53441,1983.)... 

Gryaznov, V.M., Hydrogen permeable palladium membrane catalysts, an aid to the efficient production of ultra purechemicals and pharmaceuticals, Plat. Met. Rev., 30,68-72,1986. 

Gryaznov, V.M., M.M. Ermilova, L.S. Morozova, and N.V. Orekhova, Palladium alloys as hydrogen permeable catalysts in hydrogenation and dehydrogenation reactions, ]. Less-Common Metals, 89,529-535,1983. 

Uemiya, S., T. Matsuda, and E. Kikuchi, Hydrogen permeable palladium-silver alloy membrane supported on porous ceramics, /. Membr. Sci., 56, 315,1991b. 

Developing a plastic liner with acceptably low hydrogen permeability... 

Some hydrogenation techniques may induce surface damage that increases the H concentration at the surface. Some of the compounds tend to decompose during hydrogenation for example, the surface of InP decomposes with the formation of phosphine (PH3). This problem has been controlled by encapsulating the substrate with a hydrogen-permeable layer. 

The focus of this work is to extend the Nb-Ti-Ni membrane development work with a direct replacement of Nb with V, evaluate the hydrogen permeability of this alloy and four thin foil metallic glasses. 

V-Ti-Ni alloys and Fe- /Co-Based metallic glasses have been evaluated with respect to hydrogen permeability for potential use in hydrogen purification membrane reactor application. Microstructural characterization of the V-Ti-Ni alloy using SEM has shown similar microstructural features to a previously evaluated Nb-Ti-Ni alloy namely, the occurrence of a primary phase surrounded by interdendritic eutectic. 

The improved process reduced the cycle time from 3 min to less than 10 sec and showed excellent capability and controllability with the value of Cp] at 2.33. The ex situ testing of the plate exhibited an encouraging performance, which included high electrical conductivity (600 800 S/cm), high flexural strength (600 - 7,000 psi), and low hydrogen permeability (smaller than 2 x 10 cm /sec)—all of which exceeded or reached DoE 2010 fargefs (see Table 5.1)... 

Mishchenko, A. P., M. E. Sarylova, V. M. Gryaznov, V. S. Smirnov, N. R. Roshan, V. P. Polyakova and E. M. Savitskii. 1977. Hydrogen permeability and catalytic activity of membranes made of palladium-copper alloys in relation to the dehydrogenation of 1,2-cyclohexanediol. Izv. Akad. Nauk SSSR, Ser. Khim. 7 1620-1622. 

Mishchenko, A. P. and M. E. Sarylova. 1981. Hydrogen permeability and catalytic activity of a membrane catalyst from a palladium alloy containing 6% ruthenium in relation to hydrogenation of 1,3-pcntadicnc. Met. i Splavy Membrane Kak. Katalyz. M. 75-81. 

Van Deventer and co-workers (23) recently investigated the thickness of vanadium oxide on as-received metal and heated specimens. Oxide thicknesses of up to 10 pm were observed, depending on the treatment. Hydrogen pretreatment seemed to increase the hydrogen permeability through the specimens. Similar effects of hydrogen pretreatment frequently have been seen. 

Figure 8.10 Phenol synthesis by direct hydroxylation of benzene using a hydrogen-permeable membrane. (Adapted from [83]).

Figure 2.40 Blocking of hydrogen in hydrogen/sulfur dioxide gas mixture permeation experiments with finely microporous membranes [63] as a function of the amount of sulfur dioxide adsorbed by the membrane. As sulfur dioxide sorption increases the hydrogen permeability is reduced until at about 140 cm3 (SO2) (STP) /g, the membrane is completely blocked and only sulfur dioxide permeates. Data obtained at several temperatures fall on the same master curve ( , 0°C A. —10 °C , — 20.7 °C A, —33.6°C). Reprinted from R. Ash, R.M. Barrer and C.G. Pope, Flow of Adsorbable Gases and Vapours in Microporous Medium, Proc. R. Soc. London, Ser. A, 271, 19 (1963) with permission from The Royal Society...

D.J. Edlund and D.T. Friesen, Hydrogen-permeable Composite Metal Membrane and Uses Thereof, US Patent 5,217,506 (June, 1993). 

D.J. Edlund, D. Friesen, B. Johnson and W. Pledger, Hydrogen-permeable Metal Membranes for High-temperature Gas Separations, Gas Sep. Purif. 8, 131 (1994). 

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