The permeability of hydrogen in bulk palladium at elevated temperatures and pressures

Morreale, Bryan D.; Ciocco, Michael V.; Enick, Robert M.; Morsi, Badi I.; Howard, Bret H.; Cugini, A.V.; Rothenberger, K. S.

doi:10.1016/s0376-7388(02)00456-8

Cited by 284 publications

(180 citation statements)

References 10 publications

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“…Operating pressures were also raised from 1 to 13 bar at 300 o C. The data are presented in Figure 5. The hydrogen flux in terms of the permeability are in the order of 2~7 x10 -8 mole/s/m/Pa 1/2 , which are comparable to the typical hydrogen flux of the palladium membranes reported in the literature [4]. Fifteen membane samples were tested in the permeation unit.…”

Section: Hydrogen Permeation Data For Palladium-alloy Membranesupporting

confidence: 75%

A Novel Membrane Reactor for Direct Hydrogen Production From Coal

Doong¹,

Ong²,

Atroshenko³

et al. 2004

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Gas Technology Institute is developing a novel concept of membrane gasifier for high efficiency, clean and low cost production of hydrogen from coal. The concept incorporates a hydrogen-selective membrane within a gasification reactor for direct extraction of hydrogen from coal-derived synthesis gases. The objective of this project is to determine the technical and economic feasibility of this concept by screening, testing and identifying potential candidate membranes under high temperature, high pressure, and harsh environments of the coal gasification conditions. The best performing membranes will be selected for preliminary reactor design and cost estimates.To evaluate the performances of the candidate membranes under the gasification conditions, a high temperature/high pressure hydrogen permeation unit has been constructed in this project. The unit is designed to operate at temperatures up to 1100 o C and pressures to 60 atm for evaluation of ceramic membranes such as mixed ionic conducting membrane. The unit was fully commissioned and is operational. A membrane gasification reactor model was developed to consider the H 2 permeability of the membrane, the kinetics and the equilibriums of the gas phase reactions in the gasifier, the operating conditions and the configurations of the membrane reactor. The results show that the hydrogen production efficiency using the novel membrane gasification reactor concept can be increased by about 50% versus the conventional gasification process. This confirms the previous evaluation results from the thermodynamic equilibrium calculation.A rigorous model for hydrogen permeation through mixed proton-electron conducting ceramic membranes was also developed based on non-equilibrium thermodynamics. The hydrogen flux predicted from the modeling results are in line with the data from the experimental measurement. The simulation also shows that the presence of steam in the permeate side or the feed side of the membrane can have a small negative effect on the hydrogen flux, in the order of 10%.

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Section: Hydrogen Permeation Data For Palladium-alloy Membranesupporting

confidence: 75%

A Novel Membrane Reactor for Direct Hydrogen Production From Coal

Doong¹,

Ong²,

Atroshenko³

et al. 2004

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“…The permeability, ϕ [mol H 2 /m s Pa 0.5 ], is commonly used as a measure of membrane material. However, deviation from the law has been widely reported [1][2][3][4][5].…”

Section: Introductionmentioning

confidence: 99%

Application of Extended Permeability to a Thick Palladium Membrane

Hara

Ishitsuka

Suda

et al. 2010

AMR

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Abstract. Some dense metal membranes are permeable only to hydrogen, useful to produce and purify hydrogen. Conventionally, hydrogen permeation flux through metal membranes is described as the square-root law. The permeability defined in the law is commonly used as a measure of membrane material. However, deviation from the law has been widely reported. We have extended the definition of permeability for precise description. This study applied it to a thick palladium membrane down to 0.01 MPa in absolute pressure. Experimental results showed that hydrogen permeation flux through the palladium membrane 200 µm thick did not obey the square-root law completely. From the permeation behavior, pressure-dependent permeability was evaluated. The resultant permeability was found to decrease and become a constant value, or intrinsic permeability, as pressure approached vacuum.

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“…From a microscopic point of view, the hydrogen permeation process occurs according to the following steps [3][4][5]. First, the hydrogen molecules impact onto the outer surface of the vacuum environment, and are absorbed by the outer surface.…”

Section: Main Failure Mode Of Vitmentioning

confidence: 99%

Novel methods by using non-vacuum insulated tubing to extend the lifetime of the tubing

Zhou

Zhu

et al. 2015

Front. Energy

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The analysis of the failure mechanics, namely hydrogen permeation of vacuum insulated tubing (VIT), indicated that the failure of VIT could be decreased but could not be avoided. To solve this problem, some measures by using non-vacuum materials were proposed and analyzed in this paper. The results show that to fill the tubing with foam-glass beads or high pressure argon may lead to a good performance.

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The permeability of hydrogen in bulk palladium at elevated temperatures and pressures

Cited by 284 publications

References 10 publications

A Novel Membrane Reactor for Direct Hydrogen Production From Coal

A Novel Membrane Reactor for Direct Hydrogen Production From Coal

Application of Extended Permeability to a Thick Palladium Membrane

Novel methods by using non-vacuum insulated tubing to extend the lifetime of the tubing

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