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Carbon-loaded titanium dioxide-doped lithium aluminum hydride hydrogen storage material and preparation method thereof

A technology of titanium dioxide and lithium aluminum hydride, which is applied in the preparation/purification of titanium oxide/hydroxide, titanium dioxide, carbon, etc., can solve problems such as improvement, achieve low initial hydrogen release temperature, improve hydrogen release performance, and release hydrogen. The effect of hydrogen performance improvement

Inactive Publication Date: 2021-02-26
GUILIN UNIV OF ELECTRONIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, the inventors have found that the catalytic effect of the catalyst does not simply improve with the increase in the amount of addition, but depends on the special electronic structure of the catalyst itself, that is, the root of the above-mentioned problems lies in solving the relationship between the electronic structure of the catalyst and LiAlH 4 matching problem

Method used

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  • Carbon-loaded titanium dioxide-doped lithium aluminum hydride hydrogen storage material and preparation method thereof
  • Carbon-loaded titanium dioxide-doped lithium aluminum hydride hydrogen storage material and preparation method thereof
  • Carbon-loaded titanium dioxide-doped lithium aluminum hydride hydrogen storage material and preparation method thereof

Examples

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Effect test

Embodiment 1

[0051] A method for preparing a carbon-supported titanium dioxide-doped lithium aluminum hydride hydrogen storage material, comprising the following steps:

[0052] Step 1) Preparation of carbon-supported titanium dioxide generated in situ, measure glycerol, ethanol and butyl titanate at a volume ratio of 5:15:1, first mix glycerol and ethanol evenly as a solvent, and then , the solvent was magnetically stirred at a speed of 50 rpm / min, and butyl titanate was added dropwise to the above solvent while stirring, and the stirring time was 8 min. Then, the resulting mixed solvent was subjected to solvothermal reaction at 180 °C, and the reaction time was 24 h. After the reaction, the product was washed three times. To avoid hydrolysis, absolute ethanol was used as the detergent. The washed product was vacuum-dried at 60 °C for 12 h, and then the dried product was placed in a nitrogen atmosphere at 5 °C / Min heating rate increased to 450 °C, and the calcination time was 3 h, and th...

Embodiment 2

[0082] A carbon-supported titanium dioxide-doped lithium aluminum hydride hydrogen storage material (TiO 2 @C content is the preparation method of 2 wt%), the steps not specified in particular are the same as in Example 1, the difference is: in the step 2, TiO 2 The amount of @C added was 2 wt%, and 0.0100 g TiO was weighed in an argon atmosphere glove box 2 @C and 0.4900 g LiAlH 4 .

[0083] Will get TiO 2 @C content is 2 wt% Lithium aluminum hydride hydrogen storage material is subjected to temperature rise dehydrogenation test, the test method is the same as in Example 1, and the test results are as follows Figure 5 As shown, the initial hydrogen desorption temperature is 69 °C, and when the temperature rises to 300 °C, the hydrogen desorption amount is 7.36 wt%, and the hydrogen desorption rate reaches 97.4% of the theoretical value.

Embodiment 3

[0085] A carbon-supported titanium dioxide-doped lithium aluminum hydride hydrogen storage material (TiO 2 @C content is the preparation method of 8 wt%), the steps not specified in particular are the same as in Example 1, the difference is: in the step 2, TiO 2 The amount of @C added was 8 wt%, and 0.0400 g TiO was weighed in an argon atmosphere glove box 2 @C and 0.4600 g LiAlH 4 .

[0086] Will get TiO 2 @C content is 8 wt% lithium aluminum hydride hydrogen storage material to carry out temperature rise dehydrogenation test, test method is the same as embodiment 1, test result is as follows Figure 5 As shown, the initial hydrogen desorption temperature is 55 ℃, and when the temperature rises to 300 ℃, the hydrogen desorption amount is 6.89 wt%, and the hydrogen desorption rate reaches 97.1% of the theoretical value.

[0087] Therefore, TiO 2 The comprehensive hydrogen desorption performance of lithium aluminum hydride hydrogen storage materials with @C content of 6 wt...

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Abstract

The invention discloses a carbon-loaded titanium dioxide-doped lithium aluminum hydride hydrogen storage material which is prepared by mixing lithium aluminum hydride and in-situ generated carbon-loaded titanium dioxide TiO2 (at) C and mechanically ball-milling. The microstructure of the carbon-loaded titanium dioxide TiO2 (at) C is a three-dimensional flower shape with a diameter of 1 [mu] m, andthe carbon-loaded titanium dioxide TiO2 (at) C is prepared by calcining a precipitate generated by a heating reaction of butyl titanate in a glycerol and ethanol mixed solution. The addition amount of the carbon-loaded titanium dioxide TiO2 (at) C accounts for 2-8 wt% of the total mass. The preparation method comprises the following steps: 1) preparing carbon-loaded titanium dioxide generated insitu; and 2) preparing the carbon-loaded titanium dioxide-doped lithium aluminum hydride hydrogen storage material. As an application in the field of hydrogen storage, when the doping amount of the catalyst is 2-6 wt%, the hydrogen desorption temperature of the system is reduced to 57-69 DEG C, and the hydrogen desorption amount reaches 7.12-7.36 wt%. The material has the following advantages: 1,the carbon-loaded titanium dioxide generated in situ effectively reduces the hydrogen desorption temperature of lithium aluminum hydride, and has high final hydrogen desorption amount; 2, the cost islow, the preparation process is simple, the reaction is controllable, and large-scale preparation is easy;.

Description

technical field [0001] The invention relates to the technical field of hydrogen storage materials for new energy materials, in particular to an in-situ generated carbon-supported titanium dioxide-doped lithium aluminum hydride hydrogen storage material and a preparation method thereof. Background technique [0002] Traditional fossil energy such as petroleum and coal are becoming increasingly exhausted with the continuous use of human beings. The resulting energy crisis restricts the development of human society. It has become the consensus of all mankind to find green, efficient and renewable new energy to replace fossil energy, and A lot of research results have been obtained. Hydrogen energy has the advantages of abundant raw material sources, high energy density, environmentally friendly products, and renewable energy, and has become one of the most potential alternative energy sources at present. At present, the development and utilization of hydrogen energy mainly fac...

Claims

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Application Information

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IPC IPC(8): C01B3/00C01G23/053C01B32/05C01B6/24
CPCC01B3/0078C01G23/053C01B32/05C01B6/243C01P2004/61C01P2004/45Y02E60/32
Inventor 孙立贤岑文龙徐芬陈沛荣夏永鹏魏胜胡锦炀李晶华邹勇进褚海亮
Owner GUILIN UNIV OF ELECTRONIC TECH
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