Corrigendum to “(LiNH2–MgH2): a viable hydrogen storage system”[J. Alloys Comp. 381 (2004) 284–287]

Luo, Wei

doi:10.1016/s0925-8388(04)01360-x

Cited by 118 publications

(227 citation statements)

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“…This system possesses a relatively high reversible hydrogen content ( % 5.6 wt %) [12][13][14] and suitable thermodynamic properties that allow its dehydrogenation at 1 bar equilibrium pressure at temperatures below 90 8C. [15] However, dehydrogenation at an appropriate rate usually requires temperatures above 180 8C even if the composite has undergone intensive ball milling, which shows the existence of a severe kinetic barrier in the dehydrogenation.…”

Section: Introductionmentioning

confidence: 99%

Solid–Solid Heterogeneous Catalysis: The Role of Potassium in Promoting the Dehydrogenation of the Mg(NH₂)₂/2 LiH Composite

et al. 2013

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Considerable efforts have been devoted to the catalytic modification of hydrogen storage materials. The K‐modified Mg(NH2)2/2 LiH composite is a typical model for such studies. In this work, we analyze the origin of the kinetic barrier in the first step of the dehydrogenation and investigate how K catalyzes this heterogeneous solid‐state reaction. Our results indicate that the interface reaction of Mg(NH2)2 and LiH is the main source of the kinetic barrier at the early stage of the dehydrogenation for the intensively ball‐milled Mg(NH2)2/2 LiH sample. K can effectively activate Mg(NH2)2 as well as promote LiH to participate in the dehydrogenation. Three K species of KH, K2Mg(NH2)4, and Li3K(NH2)4 likely transform circularly in the dehydrogenation (KH↔K2Mg(NH2)4↔KLi3(NH2)4), which creates a more energy‐favorable pathway and thus leads to the overall kinetic enhancement. This catalytic role of K in the amide/hydride system is different from the conventional catalysis of transition metals in the alanate system.

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Section: Introductionmentioning

confidence: 99%

Solid–Solid Heterogeneous Catalysis: The Role of Potassium in Promoting the Dehydrogenation of the Mg(NH₂)₂/2 LiH Composite

et al. 2013

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“…However, this substitution significantly reduces the thermodynamic barriers [7,8], and an experimental gravimetric density of 4.6 wt.% below 200 °C can be reached [6]. In the basic system for this study, the ratio of Lithium Amide to Magnesium Hydride is 2:1.1, and the reaction equation of this system is reported as [6,9] 2LiNH 2 +MgH 2 → ⏟ …”

Section: Introductionmentioning

confidence: 94%

Material properties and empirical rate equations for hydrogen sorption reactions in 2 LiNH2–1.1 MgH2–0.1 LiBH4–3 wt.% ZrCoH3

Bürger

Vitillo

et al. 2014

International Journal of Hydrogen Energy

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Abstract2 LiNH 2 -1.1 MgH 2 -0.1 LiBH 4 -3 wt.% ZrCoH 3 is a promising solid state hydrogen storage material with a hydrogen storage capacity of up to 5.3 wt.%. As the material shows sufficiently fast desorption rates at temperatures below 200 °C, it is used for a prototype solid state hydrogen storage tank that is coupled to a HT-PEM fuel cell. In order to perform design simulations for this prototype reactor with a hydrogen capacity of 2kWh el , model equations for the rate of hydrogen sorption reactions are required.Therefore, several material properties, like bulk density and thermodynamic data, have been measured and they are summarized in the present publication. Furthermore, isothermal absorption and desorption experiments are performed in a temperature and pressure range that is in the focus of the coupling procedure. Using this experimental data, two-step model equations have been fitted for the absorption and desorption reaction. These empirical model equations are able to capture the experimentally measured reaction rates and can be used for model validation of the design simulations. KeywordsLi-Mg-N-H hydride, reaction rate, model equations, hydrogen storage IntroductionDue to high theoretical storage densities, complex hydrides show the potential to improve the present state of the art of hydrogen storage for automotive applications [1]. As the hydrogen is strongly bonded to the powdered material, the amount of free gaseous hydrogen in equilibrium at room temperature and pressure is small. Therefore, hydrogen is just released when external heat is provided for the endothermal desorption reactions. In case the storage reactor is coupled to a fuel cell (FC), the required amount of hydrogen can be released by transfer of the waste heat from the FC. This kind of coupled system has already been studied by several simulations and experiments for conventional metal hydrides as well as NaAlH 4 [2,3].The present work has been developed within a framework of activities aiming to realize a hydrogen storage tank that is studied in technically relevant scale, i.e. allowing for 2 h coupled operation with a 1 kW el high temperature proton-exchange membrane (HT-PEM) fuel cell. As for an appropriate tank design modelling and simulation tools are used, reliable information on the properties of the selected

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“…1) In contrast to the compressed hydrogen and the liquefaction hydrogen, hydrogen storage in the solid state is the most promising alternative. [2][3][4][5] In the past decades, the complex hydrides consisting of light elements, e.g., alanates, [6][7][8][9][10] amides, [11][12][13][14][15] borohydrides [16][17][18][19][20] and ammonia borane (AB), [21][22][23] have been attracting extensive attention as the potential hydrogen storage materials due to their high gravimetric and volumetric hydrogen storage densities. In particular, significant efforts have been made in recent years with metal amide-hydride combined systems since Chen et al reported that lithium nitride, Li 3 N could absorb/desorb reversibly 11.4 mass% of hydrogen in 2002.…”

Section: Introductionmentioning

confidence: 99%

“…11) A variety of metal amide-hydride combinations have been designed and developed for their hydrogen storage performances. [11][12][13][14][15] However, most of them still suffer from the high operating temperature for practical applications.…”

Section: Introductionmentioning

confidence: 99%

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Hydrogen Storage Properties of the Mg(NH3)6Cl2-LiH Combined System

Liu

Luo

et al. 2011

Mater. Trans.

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Metal ammine complexes (MACs) were recently regarded as one of promising materials for reversible hydrogen storage due to their high hydrogen content. In this work, a first attempt is conducted to elucidate the hydrogen storage reversibility by combining Mg(NH 3 ) 6 Cl 2 with LiH. It is found that hydrogen is gradually evolved from the combined system during ball milling. After 24 h of milling, approximate 3.5 mass% of hydrogen, equivalent to 6 mol of H 2 molecules, is released from the Mg(NH 3 ) 6 Cl 2 -18LiH mixture. Additional 3.4 mass% of hydrogen is further desorbed from the combined system milled for 24 h with a two-step reaction in heating process. Totally $ 12 mol of H 2 molecules are librated from the Mg(NH 3 ) 6 Cl 2 -18LiH mixture along with the formation and consumption of Mg(NH 2 ) 2 and LiNH 2 in the ball milling and subsequent heating process. The resultant products consist of Li 2 Mg(NH) 2 , Li 2 NH, LiH and LiCl after dehydrogenation at 310 C. Further hydrogenation experiment indicates that $ 6 mol of H 2 molecules are reversibly stored in the Mg(NH 3 ) 6 Cl 2 -12LiH mixture.

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Corrigendum to “(LiNH2–MgH2): a viable hydrogen storage system”[J. Alloys Comp. 381 (2004) 284–287]

Cited by 118 publications

References 0 publications

Solid–Solid Heterogeneous Catalysis: The Role of Potassium in Promoting the Dehydrogenation of the Mg(NH₂)₂/2 LiH Composite

Solid–Solid Heterogeneous Catalysis: The Role of Potassium in Promoting the Dehydrogenation of the Mg(NH₂)₂/2 LiH Composite

Material properties and empirical rate equations for hydrogen sorption reactions in 2 LiNH2–1.1 MgH2–0.1 LiBH4–3 wt.% ZrCoH3

Hydrogen Storage Properties of the Mg(NH<SUB>3</SUB>)<SUB>6</SUB>Cl<SUB>2</SUB>-LiH Combined System

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Corrigendum to “(LiNH2–MgH2): a viable hydrogen storage system”[J. Alloys Comp. 381 (2004) 284–287]

Cited by 118 publications

References 0 publications

Solid–Solid Heterogeneous Catalysis: The Role of Potassium in Promoting the Dehydrogenation of the Mg(NH2)2/2 LiH Composite

Solid–Solid Heterogeneous Catalysis: The Role of Potassium in Promoting the Dehydrogenation of the Mg(NH2)2/2 LiH Composite

Material properties and empirical rate equations for hydrogen sorption reactions in 2 LiNH2–1.1 MgH2–0.1 LiBH4–3 wt.% ZrCoH3

Hydrogen Storage Properties of the Mg(NH<SUB>3</SUB>)<SUB>6</SUB>Cl<SUB>2</SUB>-LiH Combined System

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Solid–Solid Heterogeneous Catalysis: The Role of Potassium in Promoting the Dehydrogenation of the Mg(NH₂)₂/2 LiH Composite

Solid–Solid Heterogeneous Catalysis: The Role of Potassium in Promoting the Dehydrogenation of the Mg(NH₂)₂/2 LiH Composite