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Ammonia borane/magnesium hydride/heat conducting agent composite hydrogen storage material and its preparation and hydrogen release method

A hydrogen storage material, ammonia borane technology, applied in chemical instruments and methods, metal hydrides, inorganic chemistry, etc., can solve the problems of slow hydrogen release kinetics, release hydrogen capacity, etc., to improve hydrogen release performance, ensure Hydrogen release performance, cost-effective effect

Inactive Publication Date: 2018-05-08
MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] Aiming at the problems of slow hydrogen desorption kinetics of ammonia borane at a mild temperature, the release of a large amount of impurity gas during the dehydrogenation process, and low hydrogen desorption capacity, the present invention provides an ammonia borane / magnesium hydride / heat conducting agent composite hydrogen storage material and its Preparation and dehydrogenation method, which achieves low-temperature and high-capacity dehydrogenation well through the comprehensive use of component optimization and dehydrogenation condition control

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  • Ammonia borane/magnesium hydride/heat conducting agent composite hydrogen storage material and its preparation and hydrogen release method
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  • Ammonia borane/magnesium hydride/heat conducting agent composite hydrogen storage material and its preparation and hydrogen release method

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Embodiment

[0026] The invention provides a novel composite hydrogen storage material, which is composed of ammonia borane with a molar ratio of 2:0.8 to 1 (the optimal ratio is 2:1), magnesium hydride and a heat conducting agent, wherein ammonia borane It is ammonia borane that undergoes a partial phase transition after being placed at room temperature for more than 6 months or heat-treated at 80°C for 10 to 30 minutes. It contains both normal phase and active phase, such as figure 1 shown.

[0027] The process of preparing a composite hydrogen storage material is mainly to mix ammonia borane, magnesium hydride and a heat conducting agent and perform ball milling to obtain a powdered hydrogen storage material. In this embodiment, ammonia borane can be purchased from a chemical reagent company, or can be Self-prepared according to the literature method, the purity is generally required to be not less than 90%, and magnesium hydride and heat conduction agent can also be purchased from chem...

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Abstract

The invention discloses an ammonia borane / magnesium hydride / heat conduction agent compound hydrogen storage material. The material is composed of magnesium hydride, a heat conduction agent, and ammonia borane subjected to partial phase change after being placed at room temperature for six months or more or thermally treated for 10-30 min, wherein the molar ratio of ammonia borane to magnesium hydride is 2:(0.8-1), and the mass of the heat conduction agent is 5-30 wt% of the sum of the mass of ammonia borane and that of magnesium hydride. The invention further provides preparing and hydrogen desorption methods of the compound hydrogen storage material. Through combination of component optimization and hydrogen desorption condition control, high-capacity hydrogen desorption of the compound hydrogen storage material under the low-temperature condition is well achieved, and then application requirements are met. Commercial application in the fields such as hydrogen refueling stations, hydrogen cell automobiles and mobile hydrogen sources can be achieved. Therefore, the ammonia borane / magnesium hydride / heat conduction agent compound hydrogen storage material has high practical value and popularization value.

Description

technical field [0001] The invention relates to the technical field of clean energy materials, in particular to an ammonia borane / magnesium hydride / heat conducting agent composite hydrogen storage material and its preparation and hydrogen release methods. Background technique [0002] Hydrogen energy is considered as an ideal secondary energy source due to its wide source, clean and pollution-free characteristics. Therefore, the development of hydrogen fuel cell vehicles is considered to be one of the important ways to solve urban air pollution. At present, the "bottleneck" that restricts the large-scale commercial application of hydrogen fuel cell vehicles is the safe and efficient storage of hydrogen. Compared with high-pressure gaseous hydrogen storage and low-temperature liquid hydrogen storage, material-based solid-state hydrogen storage is considered to be a safer and more efficient hydrogen storage method. However, traditional metal hydrides and physical adsorption h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B3/02C01B6/13
CPCC01B3/02C01B6/13
Inventor 罗军洪王劲川张志安永涛姚伟志邓立宋江锋陈长安罗德礼
Owner MATERIAL INST OF CHINA ACADEMY OF ENG PHYSICS
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