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Composite hydrogen storage material and preparation method thereof

A hydrogen storage material and borohydride technology are applied in the field of composite hydrogen storage materials and their preparation, which can solve the serious problems of thermodynamics, kinetics, low hydrogen release rate and high hydrogen release temperature, and achieve simple preparation process, low cost, The effect of a wide range of raw materials

Active Publication Date: 2017-02-22
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, since LiBH 4 It belongs to the orthorhombic crystal system, in which the B atom is covalently bonded with the surrounding 4 H atoms to form [BH 4 ] - Tetrahedral, and then bind Li in the form of ionic bonds + Formation of LiBH 4 Crystal, the spatial configuration is a stable tetrahedral structure, and the elements have strong chemical bonding, making LiBH 4 The representative alkali metal borohydride compounds are facing serious thermodynamic and kinetic problems of hydrogen absorption / desorption
Its dehydrogenation temperature is high, the dehydrogenation rate is low and the amount of hydrogen desorption is low

Method used

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  • Composite hydrogen storage material and preparation method thereof
  • Composite hydrogen storage material and preparation method thereof
  • Composite hydrogen storage material and preparation method thereof

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preparation example Construction

[0044] The present invention also provides a method for preparing the composite hydrogen storage material, which method includes:

[0045] (1) Ball mill the borohydride of the first metal element and the halide of the second metal element in the presence of a liquid phase protective agent in an inert atmosphere; the liquid phase protective agent is cyclohexane and / or heptane alkyl;

[0046] (2) Desolvate the ball milled product;

[0047] Wherein, the first metal element is Li, Na, or K; the second metal element is Rb, Cs, group IIA element, group IIIB element, group IVB element, group VB element, group VIB element , One or more of Group VIIB elements, Group VIII elements, Group IB elements, Group IIB elements and Group IIIA metal elements.

[0048] According to the present invention, the first metal element and the second metal element are as described above, and will not be repeated here.

[0049] Among them, the borohydride of the first metal element is LiBH 4 , NaBH 4 And KBH 4 One...

Embodiment 1

[0067] This embodiment is used to illustrate the composite hydrogen storage material of the present invention and its preparation method.

[0068] (1) In a glove box filled with argon, put 11.256mmol of LiBH 4 And 1.876mmol of MgCl 2 Add a stainless steel ball mill tank (the ball-to-material mass ratio is 20:1, the diameter of the steel ball is 8mm), and add 1.7 mL cyclohexane, seal the ball mill tank and take out the glove box. The ball milling is carried out on a planetary ball mill. The milling conditions include: at 25°C, at a speed of 300 rpm, alternating forward and reverse operation (a short pause of 0.2h after each operation for 1 hour, and then reverse operation), the effective ball milling time is 20 hours.

[0069] (2) Dry the ball-milled product at 25°C for 4 hours under a vacuum pressure of -100KPa to obtain a composite hydrogen storage material A1.

[0070] Detected by XRD pattern (see the pattern figure 1 (a)), the composite hydrogen storage material has the original m...

Embodiment 2

[0072] This embodiment is used to illustrate the composite hydrogen storage material of the present invention and its preparation method.

[0073] (1) In a glove box filled with argon, add 19.270mmol of LiBH 4 And 3.854mmol of CaCl 2 Add a stainless steel ball mill tank (the mass ratio of ball to material is 10:1, the diameter of the steel ball is 8mm), and add 4.2 mL of cyclohexane, seal the ball mill tank and take out the glove box. Ball milling is carried out on a planetary ball mill. The milling conditions include: at 25°C, 400rpm, alternating forward and reverse operation (a short pause of 0.2h after each operation for 1 hour, and then reverse operation), the effective ball milling time is 10h.

[0074] (2) Dry the ball-milled product at 25°C for 2 hours under a vacuum pressure of -100KPa to obtain a composite hydrogen storage material A2.

[0075] Detected by XRD pattern (see the pattern figure 2 (a)), the composite hydrogen storage material has the original substance CaCl 2 A...

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Abstract

The invention relates to the field of hydrogen storage materials, in particular to a composite hydrogen storage material and a preparation method thereof. The hydrogen storage material comprises borohydride of a first metal element doped with second metal elements, wherein the first metal element is Li or Na or K, and the second metal elements are one of or multiple of Rb, Cs, a group-IIA element, a group-IIIB element, a group-IVB element, a group-VB element, a group-VIB element, a group-VIIB element, a group-VIII element, a group IB element, a group-IIB element and a group-IIIA metal element. According to the composite hydrogen storage material, ordinary light-metal borohydride is doped with the second metal elements, the borohydride of the first metal element doped with the second metal elements is non-solvate, and therefore hydrogen which is safer and purer in atmosphere can be released.

Description

Technical field [0001] The invention relates to the field of hydrogen storage materials, in particular to a composite hydrogen storage material and a preparation method thereof. Background technique [0002] Hydrogen is a ubiquitous element in the universe. 66% of the earth’s material is composed of hydrogen. As a completely clean new energy and renewable energy, hydrogen energy is rich in reserves, light in weight, high in energy density, and environmentally friendly. Advantages, it is considered to be one of the most promising new energy sources to replace traditional fossil energy in the future. Under normal temperature and pressure, hydrogen exists in gaseous form, and its characteristics such as easy diffusion, flammability, and explosiveness have brought great difficulties to the storage and transportation of hydrogen. Therefore, the safe and efficient storage technology of hydrogen limits the large-scale and practical utilization of hydrogen energy. [0003] Solid-state hy...

Claims

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Application Information

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IPC IPC(8): C01B6/21C01B3/00
CPCC01B3/001C01B6/21C01P2002/70C01P2004/80Y02E60/32
Inventor 白莹吴锋吴川裴紫薇孙婷
Owner BEIJING INSTITUTE OF TECHNOLOGYGY