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Catalyst for preparing NaALH4 hydrogen storage system and preparation method of hydrogen storage system

A technology of sodium aluminum tetrahydrogen and a catalyst, which is applied in chemical instruments and methods, physical/chemical process catalysts, hydrogen production, etc., can solve problems such as large molecular weight, high temperature and high pressure, and lack of hydrogen storage capacity, and achieves a simple preparation method , easy to achieve effect

Inactive Publication Date: 2012-05-09
NANKAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the high-valence Ti compound catalyst itself does not have hydrogen storage capacity and has a large molecular weight. In addition, non-volatile inert by-products (such as sodium oxide and sodium chloride) are generated during the reaction process, so the actual hydrogen storage capacity of the system Far below the theoretical hydrogen release capacity
Later, people added transition metal chlorides, fluorides (such as TiCl 3 、TiF 3 ) as a catalyst has achieved certain results in kinetic hydrogen desorption performance, but high temperature and high pressure are required in the preparation process

Method used

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  • Catalyst for preparing NaALH4 hydrogen storage system and preparation method of hydrogen storage system
  • Catalyst for preparing NaALH4 hydrogen storage system and preparation method of hydrogen storage system
  • Catalyst for preparing NaALH4 hydrogen storage system and preparation method of hydrogen storage system

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Mixing of reactants

[0029] At room temperature and under the protection of argon, after weighing equimolar amounts of NaH and Al powders and placing them in a ball mill jar, add 8 mol% catalyst TiB to the above mixture 2 , mixed evenly to obtain a silver-gray mixture.

[0030] (2) Mechanical ball milling

[0031] Under an argon atmosphere, stainless steel balls with a diameter of 10 mm were added according to the ball-to-material mass ratio of 40:1. The ball mill jar is sealed well, vacuumized, and then high-purity hydrogen gas with a pressure of 1 MPa is introduced. Adjust the rotational speed of the ball mill to 450rpm, place the ball mill tank on the ball mill for 40 hours, open the tank every 5 hours, and measure XRD every 10 hours. After 40 hours of ball milling, NaAlH with good hydrogen storage performance was obtained 4 , see attached figure 1 .

Embodiment 2

[0033] (1) Mixing of reactants

[0034] At room temperature and under the protection of argon, after weighing equimolar amounts of NaH and Al powders and placing them in a ball mill jar, add 8 mol% TiB to the above mixture 2 , mix evenly to obtain a mixture of silver ash.

[0035] (2) Mechanical ball milling

[0036] Under an argon atmosphere, stainless steel balls with a diameter of 10 mm were added according to the ball-to-material mass ratio of 40:1. Seal the ball mill tank well, vacuumize it, and then feed high-purity hydrogen gas with a pressure of 2MPa. Adjust the rotational speed of the ball mill to 450rpm, place the ball mill tank on the ball mill for milling for 15 hours, open the tank every 5 hours, and measure XRD every 5 hours. After 15 hours of ball milling, NaAlH with good hydrogen storage performance was obtained 4 , see attached figure 2 .

Embodiment 3

[0038] With the NaAlH that embodiment 1 obtains 4 Take TPD hydrogen desorption test as an example, the heating rate is 2°C / min. From attached image 3 It can be seen that NaAlH 4 The dehydrogenation temperature is obviously lowered, and the dehydrogenation capacity can reach 5.0wt%.

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Abstract

The invention discloses a catalyst for preparing a NaALH4 hydrogen storage system and a preparation method of the hydrogen storage system. The system is prepared through catalyzing by using TiB2 which is synthesized through a solid phase method. The catalyst disclosed by the invention is prepared through the following steps of: grinding Ti(SO4)2, then, evenly mixing the ground Ti(SO4)2 with KBH4 according to a molar ratio of 1:2, then, tabletting, and vacuum drying to obtain the catalyst product TiB2. The preparation method of the hydrogen storage system comprises the following steps of: directly mixing NaH, Al and the TiB2; and then, carrying out ball milling in hydrogen atmosphere. The catalyst and the preparation method have the advantages that: the TiB2 is the catalyst which is prepared through a solid phase synthesis method and has excellent catalytic performance; and NaALH4 can be obtained only through catalytic hydrogenation at room temperature, the yield of the synthesized NaALH4 is high, and the NaALH4 has excellent capability of hydrogen absorption / desorption and high hydrogen storage capacity.

Description

technical field [0001] The present invention relates to sodium aluminum tetrahydrogen (NaAlH 4 ) The technical field of hydrogen storage system, more specifically, relates to the preparation of NaAlH 4 A catalyst for a hydrogen storage system and a preparation method for the hydrogen storage system. Background technique [0002] Energy and the environment are the most important issues involved in the sustainable development of human society. As hydrogen energy is an efficient and clean secondary energy source, the development of hydrogen storage materials with high hydrogen storage capacity and low cost under medium and low temperature conditions is an important development direction at present. The development of advanced hydrogen storage and transportation technology is one of the key technical challenges in promoting the application of "hydrogen energy". Compared with high-pressure gaseous or low-temperature liquid hydrogen storage, material-based hydrogen storage has ...

Claims

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Application Information

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IPC IPC(8): B01J21/06C01B3/04C01B6/24
CPCY02E60/364Y02E60/36
Inventor 王一菁李丽宋大卫苏振馨蔡洪元焦丽芳袁华堂
Owner NANKAI UNIV
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