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Method for synthesizing metal coordinate hydride hydrogen-storing material directly by reaction ball milling

A hydrogen storage material and metal coordination technology, which is applied in the production of various metal hydrides, borane/diborane hydrides, hydrogen, etc., can solve the complex process, high production cost, large equipment investment, etc. problem, to achieve the effect of simple temperature requirements, low cost, and simple production process

Inactive Publication Date: 2008-09-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although various improved technologies have been proposed to reduce the reaction temperature or increase the actual hydrogen storage capacity, none of them can overcome the disadvantages of the two-step method, such as the need to operate under high temperature and pressure, complex process flow, large equipment investment and high production cost.

Method used

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  • Method for synthesizing metal coordinate hydride hydrogen-storing material directly by reaction ball milling
  • Method for synthesizing metal coordinate hydride hydrogen-storing material directly by reaction ball milling
  • Method for synthesizing metal coordinate hydride hydrogen-storing material directly by reaction ball milling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] MNH according to the chemical formula 4 Coordination hydride hydrogen storage materials, choose M to be Na; N to be Al, that is, to form NaAlH 4 Coordinated hydrides. Using NaH and Al powder as raw materials, elemental Ti as catalyst, calculate the weight ratio of NaH and Al powder according to NaH:Al=1:1 (molar ratio), and then calculate Ti according to 4mol.% of the total weight of (NaH+Al) the amount of doping. The purity of the above-mentioned NaH is ≥95%, and the particle size is 74 μm; the purity of the Al powder is ≥99%, and the particle size is 74-154 μm; the purity of the Ti powder is ≥99%, and the particle size is -2 bar, then filled with hydrogen with a purity of ≥99% and 5.0 MPa, and then ball milled at room temperature for 145 hours. Prepared NaAlH 4 The hydrogen desorption capacity was measured to be 4.09wt.% for the first time.

[0023] The main chemical reactions involved in the reaction process are:

[0024]The hydrogen absorption and desorption ...

Embodiment 2

[0027] MNH according to the chemical formula 4 Coordination hydride hydrogen storage materials, choose M to be Na; N to be Al, that is, to form NaAlH 4 Coordinated hydrides. Using NaH and Al powder as raw materials, TiF 3 As a catalyst, calculate the weight ratio of NaH and Al powder according to NaH:Al=1:1 (molar ratio), and then calculate TiF according to 2mol.% of the total weight of (NaH+Al) 3 the amount of doping. The purity of the above-mentioned NaH is ≥95%, and the particle size is 74 μm; the purity of Al powder is ≥99%, and the particle size is 74-154 μm; TiF 3 Powder purity ≥ 99%, particle size ≤ 154μm. The raw material and the catalyst are put into the ball tank of the ball mill and the balls are added at a ball-to-material ratio of 30:1. Before ball milling, evacuate the spherical tank to a vacuum degree of 10 -2 bar, then filled with hydrogen with a purity of ≥99.99% and 2.5 MPa, and then ball milled at room temperature for 125 hours, the NaAlH thus prepared...

Embodiment 3

[0032] MNH according to the chemical formula 4 As a coordination hydride hydrogen storage material, M is Li; N is Al, which constitutes LiAlH 4 Coordination hydride, with LiH and Al powder as raw materials. The selected catalyst and the doping amount of the catalyst are the same as in Example 2. The purity of LiH is more than or equal to 95%, and the particle size is 74 μm; other raw material parameters are the same as in Example 1. Before ball milling, evacuate the spherical tank to a vacuum degree of 10 -2 bar, and then filled with hydrogen with a purity of ≥99.99%, 6MPa, the other reaction ball milling process was the same as in Example 2, and then ball milled at room temperature for 120h, the prepared LiAlH 4 The actual hydrogen storage capacity is 6.3wt.%.

[0033] The main chemical reactions involved in the reaction process are:

[0034] Figure 4 Doped with TiF 3 Catalyst synthesized LiAlH 4 Kinetic curves for the first hydrogen desorption of complex hydrides....

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Abstract

The invention discloses a method for directly synthesizing a hydrogen storage material of metal coordination hydride by a reaction ball milling, which is characterized in that metal coordination hydride which is expressed in a chemical general formula as MNH4 is directly synthesized in a step by the reaction ball milling method and through controlling the hydrogenation pressure and the time of the ball milling, wherein the chemical general formula, M is one or two of Li and Na, and N is one or two of B and Al, the transition metal such as Ti, Zr and Ni, transition metal halide such as TiF3, HfCl3, TiCl4, and ScCl3, rare-earth chloride such as LaCl3, CeCl3, PrCl3, NdCl3, and SmCl3 are acted as the catalyst during the synthesis process. The method for directly synthesizing the hydrogen storage material has the advantages of only taking one step of the reaction ball milling to directly synthesize the final product of coordinate metal hydride at a room temperature, having simple operation, low energy consumption, safety, and reliability, enjoying high yield rate of the synthesized hydrogen storage material, and possessing high capacity of reversible hydrogen charging and discharging circulation at a low and intermediate temperature.

Description

technical field [0001] The invention relates to a method for preparing a hydrogen storage material, in particular to a method for directly synthesizing a metal coordination hydride hydrogen storage material by using reaction ball milling. Background technique [0002] It is an inevitable trend for mankind to gradually shift from fossil fuels to renewable energy such as solar energy, wind energy, and hydrogen energy. Hydrogen energy is eye-catching for its outstanding advantages of high combustion efficiency, clean fuel products, and diverse uses. . The technological progress and market development of proton exchange membrane fuel cells (PEMFC) fueled by hydrogen and electric vehicles have further promoted the research and development of hydrogen energy system technology. In the hydrogen energy system technology chain, hydrogen storage technology is considered to be the key one ring. So far, liquid hydrogen, lightweight high-pressure containers and metal hydride systems in ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B6/24C01B6/21C01B3/06
CPCY02E60/362Y02E60/36
Inventor 陈立新肖学章陈长聘王新华
Owner ZHEJIANG UNIV
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