Hydriding and dehydriding rates of the LaNi5-H system

Goodell, P.D.; Rudman, P.S.

doi:10.1016/0022-5088(83)90255-2

Cited by 141 publications

(30 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Solid phase loading, W/V,, is the parameter in Figure 10. The values of Q R / R O indicated in the figure for the different loadings are identical for the 10 and 20 g loadings, 5,670 K, and just a little less for the 5 g loading, 5,070 K. (Evidently by coincidence, the arithmetic average value for the three loadings, 5,470 K, is almost identical to that determined for the bulk process postulated by Goodell and Rudman, 1983, for their two-phase hydrogen absorption experiments, 5,480 K.) While kRa,/ W is shown to increase somewhat with loading, the increase is believed to be due primarily to experimental variations, particularly in the activation process. In principle, no plausible explanation is known for an increase with loading.…”

Section: Absorption Of Hydrogen In the Lani-n-undecane Slurry (Constmentioning

confidence: 57%

See 1 more Smart Citation

Kinetics of hydrogen absorption in a stirred metal hydride slurry

1986

View full text Add to dashboard Cite

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.

show abstract

Section: Absorption Of Hydrogen In the Lani-n-undecane Slurry (Constmentioning

confidence: 57%

“…Goodell and Rudman (1983) refer to the sequence of phenomena included in subprocess (a) as the surface process, and combine processes (b) and (c) into a single "bulk process. "…”

Section: Absorption In Lani-n-undecane Slurrymentioning

confidence: 99%

Kinetics of hydrogen absorption in a stirred metal hydride slurry

1986

View full text Add to dashboard Cite

show abstract

“…If the initial reaction rate is plotted versus p-pp1 a linear relation is obtained which is described best by Eq. (12). Another strong argument for a surface reaction are experiments with nickel instead of aluminum as a heat buffer.…”

Section: Results Discussion a Hydride Formationmentioning

confidence: 99%

“…AS is the surface of one particle. The total flux of hydrogen is given by n=NASk2(p-p1) (12) For experiments at constant pressure this means, that the hydrogen flux is constant and proportional to (p-pp1). For experiments in a Sieverts' apparatus this equation must be combined with Eq.…”

Section: A Physisorptionmentioning

confidence: 99%

Kinetics of formation and decomposition of metal hydrides.

Fromm

1997

Journal of Advanced Science

View full text Add to dashboard Cite

show abstract

“…Although this is a heavy metal hydride, it is recognized that this material has a wide range of practical applicability. 39,45 The reactor is filled in an anaerobic dry glovebox (during filling H 2 O and O 2 levels < 100 ppm) to prevent oxidation and contamination effects. The bed material is contained in the reactor by several micromesh filters (Sika-R 0,5).…”

Section: B Reactor Construction and Specificationsmentioning

confidence: 99%

Testing facility for hydrogen storage materials designed to simulate application based conditions

Westerwaal

Nyqvist

Haije

2011

Review of Scientific Instruments

View full text Add to dashboard Cite

For the daily use of hydrogen storage materials, not only their intrinsic storage properties are important, but also equally important is the performance under practical conditions. Besides the techniques already available for the fundamental characterization of storage materials, there is a growing need to test storage materials under conditions resembling day-to-day use. For that we developed and tested a downscaled hydrogen storage reactor with which it is possible to monitor the hydrogenation behavior under nonideal conditions. Here we present a characterization of the developed reactor setup which enables a fast screening of storage materials. For characterization and calibration purposes, we use the rather well-documented LaNi 5 -Al alloy as reference. The found experimental results agree well with the properties of LaNi 5 -Al as reported in literature. Our results show that this reactor setup enables an efficient screening of new developed storage alloys under realistic conditions and is therefore complementary to the already existing characterization setups.

show abstract

Hydriding and dehydriding rates of the LaNi5-H system

Cited by 141 publications

References 9 publications

Kinetics of hydrogen absorption in a stirred metal hydride slurry

Kinetics of hydrogen absorption in a stirred metal hydride slurry

Kinetics of formation and decomposition of metal hydrides.

Testing facility for hydrogen storage materials designed to simulate application based conditions

Contact Info

Product

Resources

About