The effect of the surface state on the hydrogen permeability and the catalytic activity of palladium alloy membranes

Рошан, Н. Р.; Mishchenko, A. P.; Polyakova, V. P.; Parfenova, N.I.; Savitsky, E.M.; Voitekhova, E.A.; Gryaznov, V. M.; Sarylova, M. E.

doi:10.1016/0022-5088(83)90352-1

Cited by 20 publications

(9 citation statements)

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“…This is the case, for example, when permeation fluxes are shown to be influenced by polishing (Belyakov et a]., 1980;Roshan et al, 1983) or by coating with porous thin films of palladium black (Radzhabov et al, 1980;Gryaznov et al, 1986aGryaznov et al, , 1986bGryaznov et al, , 1987a. This is the case, for example, when permeation fluxes are shown to be influenced by polishing (Belyakov et a]., 1980;Roshan et al, 1983) or by coating with porous thin films of palladium black (Radzhabov et al, 1980;Gryaznov et al, 1986aGryaznov et al, , 1986bGryaznov et al, , 1987a.…”

Section: Hydrogen Permeation In Pure Palladium Membranesmentioning

confidence: 99%

“…Many reported results suggest that technical membranes may show a permeation controlled by the rate of adsorption on heavily contaminated surfaces. This is the case, for example, when permeation fluxes are shown to be influenced by polishing (Belyakov et a]., 1980;Roshan et al, 1983) or by coating with porous thin films of palladium black (Radzhabov et al, 1980;Gryaznov et al, 1986aGryaznov et al, , 1986bGryaznov et al, , 1987a. It may then be concluded that dissociative adsorption and not bulk diffusion is the rate-limiting step.…”

Section: Gc(ldea')mentioning

confidence: 99%

“…The hydrogen permeability of binary alloys of palladium with various metals were studied systematically showing no increase in permeability compared to the alloys mentioned in Figure 8. Among these metals Fe (Sakamoto et al, 1982), Ni (Gol'tsov et al, 1971Roshan et al, 1983;Tarassova et a\., 1980), Ru (Mishchenko and Sarylova, 1981), Rh (Rodina et al, 1968;Artman andFlanagan, 1973), Cr (Swansiger et al, 1976) and V (Sakamoto et al, 1982) may be mentioned. Rodina et al (1971) have shown that the permeability of hydrogen in Pd-Ag alloys can be significantly increased by the addition of a small amount of gold.…”

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confidence: 99%

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Catalytic palladium‐based membrane reactors: A review

Shu¹,

Grandjean²,

et al. 1991

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Review Canada GIK 7P4This paper is an extensive review of the literature dealing with the class of catalytic membrane reactors which involves hydrogen permeable membranes made of palladium and palladium alloys. The fundamental factors which affect hydrogen permeability are first discussed. A classification of the many reactions which have been conducted in such reactors at both laboratory and commercial scales is then presented. The various techniques for the preparation of palladiumbased membranes are described and the literature on modeling and design of these reactors is also reviewed.Cet article passe en revue la littkrature relative B une classe de rkacteurs catalytiques z1 membranes utilisant des films de palladium ou d'alliages de palladium permtables a I'hydrogtne. On discute en premier lieu les facteurs qui affectent cette permeabilitk. On prCsente une classification des diverses rCactions et prockdes qui ont 6tC effectuCs dans de tels rtacteurs, au laboratoire et a I'kchelle commerciale. Les diverses techniques de prtparation des membranes 2 base de palladium sont dkcrites et on examine aussi la IittCrature portant sur la modClisation et la conception des rtacteurs.

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Section: Hydrogen Permeation In Pure Palladium Membranesmentioning

confidence: 99%

Section: Gc(ldea')mentioning

confidence: 99%

mentioning

confidence: 99%

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Catalytic palladium‐based membrane reactors: A review

Shu¹,

Grandjean²,

et al. 1991

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“…For example, a composite membrane composed of palladium on a porous glass tube was prepared by means of electroless deposition, and the membrane yields greater hydrogen permeability compared to that of commercial palladium membranes. In addition, for the same purpose, several activation methods14–16 and new fabrication technology17, 18 were also used. For instance, using microsystem technology, Keurentjes et al18 produced Pd and Pd/Ag alloy membranes that exhibited fluxes about tenfold higher than those of Pd and Pd/Ag membranes deposited on porous substrates.…”

Section: Introductionmentioning

confidence: 99%

Hydrogen permeance and surface states of Pd‐Ag/ceramic composite membranes

et al. 2006

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“…Roshan et al 28) found that mechanical polishing and chemical cleaning could improve the hydrogen permeability of Pd alloy membranes by one order. In this work, all the cold rolled Pd-25Ag alloy membranes had similar surface morphologies and conditions after the mechanical polishing.…”

Section: )mentioning

confidence: 99%

Hydrogen Permeation of Thin Pd-25Ag Membranes Prepared by Cold Rolling and Microsystem Technology

Zhang

Maeda

et al. 2008

Mater. Trans.

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Hydrogen permeation of thin Pd-25Ag membranes with the thickness down to 1.2 mm was investigated by conventional gas permeation method within the temperature range of 473-673 K. The thin Pd-25Ag membranes with the thickness down to 51 mm were prepared by cold rolling method. The 1.2 mm-thick Pd-25Ag membrane was prepared by microsystem technology. The hydrogen permeation of the prepared Pd25Ag membranes was independent of the membrane thickness until down to 51 mm. The 51 mm-thick Pd-25Ag membrane had the hydrogen permeability lower by 60% than that of the bulk Pd-25Ag metal. It mainly resulted from slow surface reaction and lower hydrogen solubility near the surface of the 51 mm-thick Pd-25Ag membrane. The hydrogen permeability of the 1.2 mm-thick Pd-25Ag membrane was one order lower than that of bulk Pd-25Ag metal because the hydrogen permeation was mainly limited by surface reaction. However, literature review indicated that the microfabricated 1.2 mm-thick Pd-25Ag membrane had the hydrogen permeability superior to those conventional Pd-25Ag membranes supported by porous materials, suggesting attractive advantages of the microsystem technology in hydrogen-separation membrane applications.

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The effect of the surface state on the hydrogen permeability and the catalytic activity of palladium alloy membranes

Cited by 20 publications

References 1 publication

Catalytic palladium‐based membrane reactors: A review

Catalytic palladium‐based membrane reactors: A review

Hydrogen permeance and surface states of Pd‐Ag/ceramic composite membranes

Hydrogen Permeation of Thin Pd-25Ag Membranes Prepared by Cold Rolling and Microsystem Technology

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