Aluminum hydride hydrogen storage material and preparation method thereof

A hydrogen storage material, aluminum hydride technology, applied in chemical instruments and methods, hydrogen, inorganic chemistry and other directions, can solve the problems of unsatisfactory hydrogen release amount, reduce the hydrogen release temperature of aluminum hydride, etc. simple craftsmanship

Inactive Publication Date: 2016-06-08
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technical solution effectively reduces the hydrogen release temperature of aluminum hydride by adding transition metal fluorides. Although this method can effectively reduce the hydrogen release temperature of aluminum hydride, the actual hydrogen release amount of aluminum hydride modified by this technology is 6.5wt. %, much lower than the theoretical hydrogen content (10.0wt%) of aluminum hydride, the amount of hydrogen released is still unsatisfactory

Method used

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  • Aluminum hydride hydrogen storage material and preparation method thereof
  • Aluminum hydride hydrogen storage material and preparation method thereof
  • Aluminum hydride hydrogen storage material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Weigh 0.6820g of AlH respectively 3 and 0.3180g of Nb 2 o 5 , namely the formula AlH 3 +5mol%Nb 2 o 5 The ratio stated, AlH 3 with Nb 2 o 5 The molar ratio of 100:5, a total of 1g.

[0030] (2) Seal the weighed sample together with 50 g of stainless steel balls in a ball mill jar for mechanical ball milling, and obtain an aluminum hydride hydrogen storage material after ball milling. The ball milling parameters are set as follows: the ball milling speed is 250 rpm, the ball milling atmosphere is argon, and the ball milling time is 2 h.

[0031] (3) The sample after ball milling was subjected to a constant rate temperature rise hydrogen desorption test, and its hydrogen desorption spectrum was as attached figure 1 shown. For comparison, pure AlH 3 The hydrogen desorption spectrum of the constant rate heating process is also drawn in the attached figure 1 middle. It can be seen that adding 5mol% Nb 2 o 5 Significantly reduced AlH 3 The hydrogen desorpt...

Embodiment 2

[0033] (1) According to formula AlH 3 +1mol%Nb 2 o 5 Said ratio weighs 0.9179gAlH 3 and 0.0821gNb 2 o 5 , AlH 3 with Nb 2 o 5 The molar ratio of 100:1, a total of 1g.

[0034](2) Seal the sample weighed in step (1) together with 50 g of stainless steel balls in a ball mill jar for mechanical ball milling, and obtain an aluminum hydride hydrogen storage material after ball milling. The ball milling parameters are set as follows: the ball milling speed is 250rpm, the ball milling atmosphere is argon, and the ball milling time is 2h.

[0035] (3) The sample after ball milling was subjected to a constant rate temperature rise hydrogen desorption test, and the dehydrogenation curve is as attached figure 2 shown. It can be seen that adding 1mol% Nb 2 o 5 AlH 3 The initial hydrogen desorption temperature dropped from 120°C to 60°C, and the drop range reached 60°C. This initial hydrogen desorption temperature is much lower than the operating temperature (85°C) of hydrog...

Embodiment 3

[0037] (1) According to formula AlH 3 Weigh 0.4247gAlH according to the ratio of +10mol%Ti 3 and 0.0753gTi, AlH 3 The molar ratio with Ti is 100:10, 1g in total.

[0038] (2) Seal the sample weighed in step (1) together with 25 g of stainless steel balls in a ball mill jar for mechanical ball milling, and obtain an aluminum hydride hydrogen storage material after ball milling. The ball milling parameters are set as follows: the ball milling speed is 150 rpm, the ball milling atmosphere is argon, and the ball milling time is 2 h.

[0039] (3) The sample after ball milling was subjected to a constant rate temperature rise hydrogen desorption test, and the dehydrogenation curve is as attached image 3 shown. It can be seen that the addition of 10mol% Ti in AlH 3 The initial hydrogen desorption temperature dropped from 120°C to 80°C, with a decrease of 40°C. This initial hydrogen desorption temperature is much lower than the operating temperature (85°C) of hydrogen fuel cell...

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Abstract

The invention discloses an aluminum hydride hydrogen storage material and a preparation method thereof. The hydrogen storage material is made from aluminum and a hydrogenation catalyst. The catalyst has a general formula of M or MxOy; M represents one or more transition metals selected from Sc, Ti, V, Cr, Mn, Fe, Cu and Nb; x equals to 1 or 2; y equals to 1,2,3,4 or 5; and the molar ratio of the hydride hydrogen and the catalyst is 100:0.1-10. The invention also discloses a preparation method of the aluminum hydride hydrogen storage material. The method is as below: sealing aluminum hydride and the catalyst in a ball milling tank for mechanical milling to obtain the aluminum hydride hydrogen storage material. The aluminum hydride hydrogen storage material modified by the method can reduce hydrogen desorption temperature of the aluminum hydride hydrogen storage material, can release hydrogen at the temperature of 60 DEG C, has high hydrogen desorption amount up to 8.0 wt%, which is higher than that of the aluminum hydride hydrogen storage material modified by the prior art.

Description

technical field [0001] The invention relates to the field of hydrogen storage materials, in particular to an aluminum hydride hydrogen storage material capable of reducing the hydrogen desorption temperature and a preparation method thereof. Background technique [0002] Hydrogen storage is one of the key technologies for hydrogen energy utilization. According to the storage state of hydrogen, hydrogen storage methods include gaseous hydrogen storage, liquid hydrogen storage and solid hydrogen storage. Gaseous hydrogen storage is generally to store hydrogen in the form of high-pressure gas in a hydrogen tank. This method has low hydrogen storage capacity and poor safety, and its application is limited; liquid hydrogen storage is generally to liquefy hydrogen and store it in a thermal insulation device. This method needs to consume a lot of energy to liquefy hydrogen, which is not suitable for large-scale application in terms of economic benefits. Solid-state hydrogen stora...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/00
CPCC01B3/0078Y02E60/32
Inventor 王新华刘海镇严密
Owner ZHEJIANG UNIV
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