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Preparing method for improving LiH-NH<3> hydrogen storing system dehydrogenizing kinetics

A kinetic and system technology, applied in chemical instruments and methods, hydrogen, inorganic chemistry, etc., can solve problems such as slow reaction kinetics and hinder practical application, and achieve the effect of accelerating hydrogen evolution reaction and improving dehydrogenation kinetics.

Inactive Publication Date: 2015-09-23
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the slow reaction kinetics of this system hinders the practical application

Method used

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  • Preparing method for improving LiH-NH&lt;3&gt; hydrogen storing system dehydrogenizing kinetics
  • Preparing method for improving LiH-NH&lt;3&gt; hydrogen storing system dehydrogenizing kinetics
  • Preparing method for improving LiH-NH&lt;3&gt; hydrogen storing system dehydrogenizing kinetics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Ball mill LiH sample: In a vacuum glove box, weigh 0.3g LiH crystal sample and put it into a ball mill jar containing 30 stainless steel balls. Then the ball mill jar was taken out from the glove box, filled with a certain amount of hydrogen, and the ball mill jar was symmetrically installed in a planetary ball mill, and ball milled at a speed of 350 rpm for 2 hours.

[0022] 2. Sampling and ammonia gas for hydrogen desorption reaction: In a vacuum glove box, accurately weigh 0.0191gLiH crystal sample in a stainless steel heating tube, install the stainless steel heating tube in the reaction device, and remove the gas circuit by vacuuming the gas circuit After removing the residual air, set the temperature controller parameters of the reaction to 100°C.

[0023] After the heating reactor reaches the set temperature, quickly fill it with 0.5MPa ammonia gas, react for 1 hour, stop the experiment, and immediately vent the gas in the pipeline. After the stainless steel h...

Embodiment 2

[0027] 1. Doped with 0.5mol% LiNH by ball milling 2 LiH sample: first for doping LiNH 2 The samples were pretreated by ball milling at 450 rpm for 24 hours. Then in the vacuum glove box, weigh 0.2957g LiH and 0.0043g LiNH 2 The samples were loaded into a ball mill jar containing 30 stainless steel balls. Then the ball mill jar was taken out from the glove box, filled with a certain amount of hydrogen, and the ball mill jar was symmetrically installed in a planetary ball mill, and ball milled at a speed of 350 rpm for 2 hours.

[0028] 2. Sampling and ammonia gas for dehydrogenation reaction: In a vacuum glove box, accurately weigh 0.0194g of the above-mentioned doped with 0.5mol% LiNH 2 LiH was placed in a stainless steel heating tube, and the stainless steel heating tube was installed in the reaction device. After vacuuming the gas circuit to remove the residual air in the gas circuit, set the parameters of the reaction temperature controller to 100 °C.

[0029] After h...

Embodiment 3

[0031] 1. Doped with 1 mol% LiNH by ball milling 2 LiH sample: In a vacuum glove box, weigh 0.2913 g LiH and 0.0087 g LiNH 2The samples (pretreated by ball milling) were loaded into a ball mill jar containing 30 stainless steel balls. Then the ball mill jar was taken out from the glove box, filled with a certain amount of hydrogen, and the ball mill jar was symmetrically installed in the QM-3SP4 planetary ball mill, and ball milled for 2 hours at a speed of 350 rpm.

[0032] 2. Sampling and ammonia gas for hydrogen desorption reaction: In a vacuum glove box, accurately weigh 0.0197 g of the above-mentioned doped sample in a stainless steel heating tube, and install the stainless steel heating tube in the reaction device, first clean the intake air of the reaction device After vacuumizing the gas path to remove the residual air in the gas path, set the parameters of the reaction temperature controller to 100 °C.

[0033] After heating to the set temperature of 100 °C, quickl...

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Abstract

The invention provides a preparing method for improving LiH-NH3 hydrogen storing system dehydrogenizing kinetics, and belongs to the technical field of solid state chemistry hydrogen storing. The method comprises the following steps that under the condition of hydrogen, after pre-ball-milling is carried out on alkali metal amides, the alkali metal amides are mixed with LiH, ball-milling treatment is carried out, and LiH materials adulterating with the alkali metal amides are obtained; under the condition without oxygen, hydrogen evolution reaction is carried out on the LiH materials adulterating with the alkali metal amides and the hydrogen, cooling is carried out after the reaction is finished, LiH-NH3 which improves the hydrogen storing system dehydrogenizing kinetics is obtained. Due to the fact that adulterating LiNH2 has the crystal nucleus function in the process that the LiH and NH3 are reacted to generated LiNH2 and H2, the hydrogen evolution reaction is accelerated to carry out, and the LiH-NH3 system dehydrogenizing kinetics can be effectively improved.

Description

technical field [0001] The invention belongs to the technical field of solid-state chemical hydrogen storage, in particular to improving LiH-NH by seed effect 3 Preparation method of dehydrogenation kinetics of (lithium hydride-ammonia) hydrogen storage system. Background technique [0002] In a sustainable and environment-friendly society, it is especially important to find a clean and high-energy energy source. Because only water is produced after hydrogen is burned in the air, it becomes the most attractive zero-pollution energy source. Although hydrogen as a light element is abundant and has high energy density, the widespread utilization of hydrogen energy is limited by the way of hydrogen storage. The traditional two hydrogen storage methods are also difficult to realize the practical application of on-board hydrogen storage due to their low volume density. The emergence of solid-state hydrogen storage technology has improved the current situation. Especially for l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/00
CPCY02E60/32
Inventor 滕云雷董宝霞陈林婷
Owner YANGZHOU UNIV
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