Hydriding and dehydriding kinetics

Rudman, P.S.

doi:10.1016/0022-5088(83)90253-9

Cited by 191 publications

(52 citation statements)

References 26 publications

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“…9 involves the conversion-dependent factor f ( F ) given by Rudman (1983) for a three-dimensional nucleation and growth process, and a linear concentration difference, c, ~ pA/He.…”

Section: Absorption In Lani-n-undecane Slurrymentioning

confidence: 99%

Kinetics of hydrogen absorption in a stirred metal hydride slurry

1986

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Isothermal, isobaric measurements were made of the rate of hydrogen absorption by a slurry of LaNi, powder suspended in n-undecane in a baffled stirred reactor. The data were interpreted using a model embodying three resistances in series: a gas-liquid mass transfer resistance, a liquid-solid mass transfer resistance, and an "overall reaction resistance."At the highest agitator speeds employed, 2,000 rpm, conversions of LaNi, to hydride of 90% or better were obtained within one minute or less, thereby confirming the potential of the metal hydride slurry concept for commercial applications. SCOPEMetal hydrides and their formers have been under study for some years as hydrogen-absorbing media.[Strictly speaking, hydrogen is absorbed by a metal hydride former, such as lanthanum nickel-five (LaNi,), also called the a-solid phase, to form a metal hydride, such as lanthanum nickel-five hexahydride (LaNi,H,), called the P-solid phase. Upon heating and/or lowering the pressure of the latter, it is transformed back to the metal hydride former, with the release (desorption) of hydrogen. However, in common discussions of these phenomena, distinction between metal hydrides and their formers is omitted and the simple term, metal hydride, is used for both, as in the present paper.]The large capacity of metal hydrides for hydrogen storage coupled with their ready release of hydrogen at moderate temperatures and pressures and their ability to undergo many cycles of absorption and desorption with little decrease in capacity, have prompted examination of their usefulness in a variety of industrial applications. These include hydrogen storage in energy conversion cycles, chemical heat pumps and compressors, hydrogen purification, and hydrogen isotope separation.

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“…9 involves the conversion-dependent factor f ( F ) given by Rudman (1983) for a three-dimensional nucleation and growth process, and a linear concentration difference, c, ~ pA/He.…”

Section: Absorption In Lani-n-undecane Slurrymentioning

confidence: 99%

Kinetics of hydrogen absorption in a stirred metal hydride slurry

1986

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“…6 gives the absorption rate as a function of F/F,,,,,, this is represented by the solid line in Figure 8. The dotted line represents a hypothetical change of the reaction rate according to a three-dimensional nucleation and growth process (Rudman, 1983 andTung et al, 1986):…”

Section: Discussionmentioning

confidence: 99%

Kinetics of hydrogen absorption and desorption in LaNi_5‐xAl_x slurries

1993

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“…But so far, the perfect MH has not been found yet. And even worse, sometimes the results from different researchers for the same alloy have large difference, even totally different as shown by Rudman [2] . The reason of this difference is that there are too many factors involved into the performance of metal hydrides, such as material preparation, gas purity, activation and stabilization procedure, and experiment system design.…”

Section: Introductionmentioning

confidence: 97%

“…For a typical cylinder container, test section which fills with metal hydrides, the temperature distribution can be described by equation (1) and (2) …”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Enhancement of Metal Hydride Particle Bed for Heat Driven Type Refrigerator by Carbon Fiber

Bae

Tanae

Monde

et al. 2008

JTST

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A series of study has been performed on the metal hydride particle beds of Ti 0.15 Zr 0.85 Cr 0.9 Fe 0.6 Ni 0.2 Mn 0.3 Cu 0.05 (MH-1, using for heat source), Ti 0.73 Zr 0.27 Cr 1.2 Fe 0.3 Ni 0.1 Mn 0.4 Cu 0.05 (MH-2, using for cooling load) to measure the effective thermal conductivities. The effective thermal conductivities of activated and oxidized MH particle bed in helium have been examined. Experiment results show that pressure has great influence on effective thermal conductivity in low pressure range (<0.5 MPa). And that influence decreases rapidly with increase of gas pressure. The reason of pressure dependence at low pressure range is that the mean free path of gas becomes greater than effective thickness of gas film which is important to the heat transfer mechanism of particle bed. In order to enhance the poor thermal conductivity of metal hydride particle bed, carbon fiber mixing method has been used in this study. Three types, two insert methods and five mass percentages of carbon fiber have been examined and compared. The highest effective thermal conductivity of MH particle bed has been reached with Type B carbon fiber which has second higher thermal conductivity, and 2 weight percentage. This method has acquired 5-6 times higher thermal conductivity than pure metal hydride particle beds with quite low quantity of additives, only 2 mass% of carbon fiber. This is a good result comparing to other method which can reach higher effective thermal conductivity but needs much higher percentage of additives too.

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Hydriding and dehydriding kinetics

Cited by 191 publications

References 26 publications

Kinetics of hydrogen absorption in a stirred metal hydride slurry

Kinetics of hydrogen absorption in a stirred metal hydride slurry

Kinetics of hydrogen absorption and desorption in LaNi_5‐xAl_x slurries

Heat Transfer Enhancement of Metal Hydride Particle Bed for Heat Driven Type Refrigerator by Carbon Fiber

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Hydriding and dehydriding kinetics

Cited by 191 publications

References 26 publications

Kinetics of hydrogen absorption in a stirred metal hydride slurry

Kinetics of hydrogen absorption in a stirred metal hydride slurry

Kinetics of hydrogen absorption and desorption in LaNi5‐xAlx slurries

Heat Transfer Enhancement of Metal Hydride Particle Bed for Heat Driven Type Refrigerator by Carbon Fiber

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Kinetics of hydrogen absorption and desorption in LaNi_5‐xAl_x slurries