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Hydrogen storage material made from magnesium hydride

A technology of magnesium hydride and magnesium powder, applied in the direction of hydrogen, nanotechnology for materials and surface science, inorganic chemistry, etc., can solve problems such as spontaneous combustion, achieve improved heat flow management, do not require sophisticated equipment, and are easy to prepare.

Inactive Publication Date: 2011-02-09
CENT NAT DE LA RECHERCHE SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The resulting powder exhibits very high hydrogen adsorption and desorption kinetics, but the powder is also very reactive and may spontaneously ignite in air

Method used

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  • Hydrogen storage material made from magnesium hydride
  • Hydrogen storage material made from magnesium hydride
  • Hydrogen storage material made from magnesium hydride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] MgH 2 / Preparation of ENG particles

[0074] In a suitable sealed mixer (located in a glove box under controlled atmosphere), 47.5 g of activated magnesium hydride powder with an average grain size of 1-10 μm (available from MCP MG Serbien or MCPHy Energy SA) were carefully mixed with was mixed with 2.5 g of expanded natural graphite (ENG, average grain size in the form of granules in lengths of a few millimeters (available from SGL Technologies GmbH)).

[0075] The powder mixture (50 g) was then poured into the mold of a hardened steel pelletizer also located in the glove box. The granulator is taken out from the glove box in the airtight bag and placed under the press.

[0076] The passing strength is 1 ton / cm 2 (10 8 Pa) uniaxial compression to compress the powder in the granulator.

[0077] A gray compressed material with an appearance close to solid graphite and 8 cm in diameter was recovered and could be handled in an open environment for several minutes. H...

Embodiment 2

[0083] MgH 2 / ENG application test and with MgH 2 contrast

[0084] The properties of the material obtained in Example 1 for hydrogen storage applications were evaluated and compared with active magnesium hydride powder.

[0085] Make the MgH that obtains in embodiment 1 by machining 2 The diameter of / ENG particles was reduced from 8cm to 7cm. Add 250g of granules to an inner diameter of 7cm and a volume of 270cm 3 stainless steel cylindrical storage tank. The tank is equipped with a heating device. The tank was then heated to 300°C and placed under a hydrogen pressure of 8 bar.

[0086] The volume of hydrogen adsorbed was recorded with a flow meter for 3 hours. Temperatures are tracked and recorded with probe devices placed in the center and perimeter of the tank.

[0087] The test was carried out under the same realization conditions, except that the particles in Example 1 were replaced with 110 g of active magnesium hydride powder.

[0088] image 3 and Figure ...

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Abstract

The invention relates to a compacted material containing magnesium hydride and expanded natural graphite and to a method for preparing one such material including the following steps in which: (i) a powdered magnesium or magnesium hydride is mixed with a powdered graphite, and (ii) the mixture is shaped by means of compaction. The invention also relates to the use of said material for the storage of hydrogen as well as to a method for hydrogen storage and release from storage, including the following steps in which: (a) the aforementioned material is placed in a suitable hydrogen tank, (b) the material is placed under hydrogen pressure in pressure and temperature conditions that enable the hydrogen to be absorbed by the material, and (c) the hydrogen is desorbed from the material in pressure and temperature conditions that enable the desorption of the material.

Description

technical field [0001] The present invention relates to a material that can be used to reversibly store hydrogen. More specifically, the present invention relates to a magnesium hydride-based compressed composite material for storing hydrogen and a method for preparing the same. Background technique [0002] Hydrogen is used in many industrial fields, especially as a fuel (eg in the field of heat engines or fuel cells) or as a reagent (eg for hydrogenation reactions). Within this framework, given the volume of gaseous hydrogen and its explosiveness, it is desirable to be able to store hydrogen in smaller volumes in safe containers. [0003] One possible approach is to store hydrogen in the form of metal hydrides. In this case, the hydrogen to be stored is brought into contact with the metal or metal alloy under pressure and temperature conditions that allow the hydrogen to bond in atomic form in the crystal lattice (adsorption or charge reaction). To recover the hydrogen ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/02
CPCY02E60/325C01B3/0026Y02E60/327C01B3/0021C01B3/0078B82Y30/00Y02E60/32F17C11/005
Inventor P·德朗戈A·谢兹D·弗吕沙尔S·米拉利亚R·奥利韦斯
Owner CENT NAT DE LA RECHERCHE SCI