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Carbon-supported nickel catalyst doped mg (bh 4 ) 2 Based hydrogen storage material and preparation method thereof

A technology of nickel catalysts and hydrogen storage materials, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of poor reversibility, slow hydrogen release kinetics, The thermodynamic properties are too stable, etc., to achieve the effects of improved reversible properties, regular material morphology, and fast hydrogen release kinetic properties.

Inactive Publication Date: 2020-01-07
ADVANCED TECHNOLOGY & MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, Mg(BH 4 ) 2 There are still problems such as too stable thermodynamic properties, slow hydrogen desorption kinetics, and poor reversibility, which also affect the Mg(BH 4 ) 2 Developments in the Field of Practical Applications

Method used

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  • Carbon-supported nickel catalyst doped mg (bh <sub>4</sub> ) <sub>2</sub> Based hydrogen storage material and preparation method thereof
  • Carbon-supported nickel catalyst doped mg (bh <sub>4</sub> ) <sub>2</sub> Based hydrogen storage material and preparation method thereof
  • Carbon-supported nickel catalyst doped mg (bh <sub>4</sub> ) <sub>2</sub> Based hydrogen storage material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] In this embodiment, five kinds of carbon-supported nickel catalysts are prepared by solution chemical reduction, and the specific preparation methods are as follows:

[0038] First, as shown in Table 1, a certain mass of functionalized CNTs was mixed with 40ml of ethylene glycol solution and ultrasonically vibrated for 2 hours, so that the CNTs were fully dispersed in the ethylene glycol solution to obtain solution a; Nickel nitrate hydrate (according to the proportioning in Table 1, ensuring that the mass fraction of Ni is 20wt%, 40wt%, 60wt% and 80wt%) was mixed with 10ml deionized water, and magnetically stirred for 2h at 40°C to prepare a solution b; Then, mix the two solutions of a and b and then add 10ml of hydrazine hydrate solution, stir magnetically at 80°C for 2h, then add NaOH (2.5mol / L) solution to adjust the pH value to slightly greater than 10, and then mix the The solution was kept at 110°C (in an oil bath) for 2 hours to ensure that Ni was completely red...

Embodiment 2

[0043] This embodiment includes the preparation of five hydrogen storage materials, and the specific preparation methods are as follows:

[0044] According to Table 2, weigh Mg (BH 4 ) 2 The powder and the additive CNTs-xNi (x=20-80wt%) prepared in Example 1 were used to prepare the mixed raw materials used in Example 2-II to Example 2-V respectively, wherein the additive was added as Mg(BH 4 ) 2 In the powder (that is, the amount of additive is additive and Mg(BH 4 ) 2 5wt% of the total mass of the powder), then five parts of mixed raw materials were put into 50ml ball mill jars and carried out mechanical ball milling, wherein the weight ratio of balls and mixed raw materials was 40:1, and the hydrogen gas (H 2 ) for protection, the ball milling speed is 350rpm, the ball milling time is 10 h, and during the ball milling process, every 6 minutes of ball milling is rested for 6 minutes, so as to prevent the ball milling tank from overheating the sample Mg(BH 4 ) 2 Decompo...

Embodiment 3

[0052] The additive CNTs-60wt% Ni was added to the raw material Mg (BH 4 ) 2 After mixing, the hydrogen storage material Mg(BH 4 ) 2 +CNTs-60wt%Ni, the whole ball milling process was filled with 3bar hydrogen (H 2 ) for protection, and rest for 6 minutes every 6 minutes during the ball milling process, the ball milling product is Mg(BH 4 ) 2 +CNTs-60wt% Ni hydrogen storage material.

[0053] The hydrogen storage materials prepared by different ball milling processes were tested by DSC at different heating rates, the temperature and heating rate in the test results were further sorted out, and the Kissinger equation was used for fitting to calculate the apparent activation energy of hydrogen desorption of the samples. The results are shown in Table 3 and Figure 6 . From Figure 6 It can be seen from the figure that the apparent activation energy of hydrogen desorption of the hydrogen storage material prepared in Example 3-II is reduced to 119.58kJ / mol, which is differe...

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Abstract

The invention relates to a carbon-supported nickel catalyst-doped Mg(BH4)2-based hydrogen storage material and a preparation method thereof, and belongs to the technical field of hydrogen storage materials for fuel cells. The preparation method comprises the following steps: 1, mixing: adding an additive into a matrix at a certain mass percentage, and mixing the matrix and the additive to obtain auniform mixture, wherein the matrix is Mg(BH4)2 powder, and the additive is a carbon-supported nickel catalyst; and 2, performing high-energy ball milling: adding the mixture obtained in the mixing step into a ball milling tank, and performing high-energy ball milling to obtain the hydrogen storage material. The preparation method has the advantages of easiness in purchasing or preparing the rawmaterials, and realization of simple and conveniently operated preparation process by adopting a high-energy ball milling technology; and the obtained material has the advantages of regular shape, uniform size, improved hydrogen release performance, realization of the initial hydrogen desorption temperature being lower than 130 DEG C, fast hydrogen desorption kinetic performances and improved reversibility.

Description

technical field [0001] The invention relates to a carbon-supported nickel catalyst doped Mg(BH 4 ) 2 A base hydrogen storage material and a preparation method thereof belong to the technical field of hydrogen storage materials for fuel cells. Background technique [0002] With the continuous development of society, human beings' demand for energy is constantly increasing, and problems such as environmental degradation and energy crisis need to be solved urgently. Human beings are urgently looking for a clean energy source. Hydrogen energy is considered as an ideal clean energy, and hydrogen storage materials related to hydrogen energy technology have also attracted widespread attention at home and abroad. Hydrogen storage materials are a class of materials that have good adsorption properties for hydrogen or can reversibly react with hydrogen to realize the storage and release of hydrogen. The development of hydrogen storage materials is the key to solving the technical pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B3/00B01J23/755
CPCB01J23/755C01B3/0078C01P2002/72Y02E60/32
Inventor 武英蒋赞原建光张宝阎有花况春江周少雄
Owner ADVANCED TECHNOLOGY & MATERIALS CO LTD
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