7646-69-7Relevant articles and documents
Ca-Na-N-H system for reversible hydrogen storage
Xiong, Zhitao,Wu, Guotao,Hu, Jianjiang,Chen, Ping
, p. 152 - 156 (2007)
Ca-Na-N-H system was introduced and evaluated in this paper for reversible hydrogen storage. Similar to other amide-hydride systems already reported, interaction between Ca(NH2)2-NaH (1/1) was observed in the temperature range of 120
Structural determination of NaAl2Ga2 intermetallic compound having the ThCr2Si2 type structure
Kadir,Noréus
, p. 149 - 151 (2009)
NaAl2Ga2 intermetallic compound has been synthesized by direct combination of the elements in the atomic ratio Na:Ga:Al = 1:2:2. Guinier-H?gg X-ray and neutron powder diffraction determined a ThCr2Si2 type struc
Na3RhH6, Na3IrH6 and Li3IrH6 - new complex hydrides with isolated [RhH6]3-- and [IrH6 ]3--octahedra
Bronger, W.,Gehlen, M.,Auffermann, G.
, p. 255 - 262 (1991)
The ternary alkali metal rhodium and iridium hydrides were synthesized by the reaction of alkali metal hydride with transition metal powder in a pure hydrogen atmosphere. The crystal structures were determined by X-ray investigations on powdered samples and elastic neutron diffraction experiments on the deuterated compounds. The isotypic atomic arrangements (space group Pnma) contain isolated [RhH6]3-- and [IrH6]3--octahedra which are separated by the alkali metal ions.
Preparation of alkali metal hydrides by mechanical alloying
Elansari,Antoine,Janot,Gachon,Kuntz,Guérard
, p. L5-L8 (2001)
Rubidium and cesium hydrides are not commercialized and we have set up, a few years ago, a method of synthesis at the laboratory scale. It is based on the reaction of alkali metal with hydrogen obtained by thermal decomposition of uranium hydride UH3 at a temperature of 450°C, which gives a pressure of hydrogen close to 3 bars. This synthesis leads to a very pure alkali metal hydride MH, but the rate of the reaction remains quite small: a few hundreds of milligrams in 24 h. A new method, based on mechanical alloying, consists in milling the alkali metal, at room temperature, under a pressure of hydrogen close to 5 bars. The reaction proceeds in 16 h and gives 3-15 g of very pure MH (from sodium to cesium, respectively) at once.
Carothers, W. H.,Coffman, D. D.
, p. 588 - 593 (1929)
Mechanochemically driven nonequilibrium processes in MNH 2-CaH2 systems (M = Li or Na)
Dolotko, Oleksandr,Zhang, Haiqiao,Li, Sa,Jena, Puru,Pecharsky, Vitalij
, p. 224 - 230 (2010)
Mechanochemical transformations of lithium and sodium amides with calcium hydride have been investigated using gas volumetric analysis, X-ray powder diffraction, and residual gas analysis. The overall mechanochemical transformations are equimolar, and the
Gilman, H.,Jacoby, A. L.,Ludeman, H.
, p. 2336 - 2338 (1938)
HIGHLY REACTIVE METAL HYDRIDES, PROCESS FOR THEIR PREPARATION AND USE
-
Paragraph 0066-0071, (2018/06/29)
The invention relates to powdery, highly reactive alkali and alkaline earth hydride compounds, and to mixtures with elements of the third main group of the periodic table of elements (PTE) and to the preparation thereof by reacting alkali or alkaline earth metals in the presence of finely dispersed metals or compounds of the third main group of the PTE, wherein the latter have one or more hydride ligands or said hydride ligands are converted in situ, under the prevailing reaction conditions, i.e., in the presence of hydrogen gas or another H source, into hydride species, and to the use thereof for the preparation of complex hydrides and organometallic compounds.
Structure, thermal analysis and dehydriding kinetic properties of Na1-xLixMgH3 hydrides
Wang, Zhong-Min,Li, Jia-Jun,Tao, Song,Deng, Jian-Qiu,Zhou, Huaiying,Yao, Qingrong
, p. 402 - 406 (2015/12/08)
NaMgH3 hydride with perovskite structure has been synthesized by high-energy ball milling, the maximum hydrogen-desorbed amount of which is 3.42 wt.% at 638 K. Two decomposition steps have been detected for perovskite-type NaMgH3 hydride, calculated values of activation energy for the two steps are 180.25 ± 8.25 kJ/mol and 156.23 ± 18.54 kJ/mol by Kissinger method. In comparison with NaMgH3 hydride, Li0.5Na0.5MgH3 hydride has better dehydriding kinetic properties and higher hydrogen-desorbed amount (4.11 wt.%) due to partial replacement of Na by Li. LiMgH3 hydride with perovskite structure cannot be synthesized by milling of the mixture of LiH and MgH2 hydrides. However, the maximum hydrogen-desorbed amount of this milled mixture is 5.54 wt.% at 638 K, this may suggest that LiH is a good catalyst for dehydrogenation of MgH2, but further research is needed.
In situ synchrotron X-ray diffraction study on the improved dehydrogenation performance of NaAlH4-Mg(AlH4)2 mixture
Yang, Cheng-Hsien,Chen, Tzu-Teng,Tsai, Wen-Ta,Liu, Bernard Haochih
, p. 6 - 10 (2013/10/01)
The dehydrogenation performance and mechanism of the synthesized NaAlH 4-Mg(AlH4)2 powders were investigated by performing thermogravimetric analysis and in situ synchrotron X-ray diffraction analysis. NaAlH4 not only facilitates the first step dehydrogenation of Mg(AlH4)2 in lowering its initial dehydrogenation temperature but also increases the total amount of H2 released. Besides, MgH2 and/or Al phases, the products of the first step dehydrogenation reaction, play a catalytic role in lowering the initial dehydrogenation temperature of NaAlH4. The synthesized NaAlH4-Mg(AlH4) 2 mixture has an initial dehydrogenation temperature as low as 120 °C, and is able to release 5.35 wt% H2 below 350 °C. The self-catalytic dehydrogenation behavior of the NaAlH4-Mg(AlH4) 2 mixture was elaborated in this work with the aid of in situ synchrotron XRD.