Spherical core-shell type LaNiAl-SiO2 compound hydrogen storage material and preparation method thereof

The technology of a hydrogen storage material and a composite material is applied in the field of spherical core-shell LaNiAl-SiO2 composite hydrogen storage material and its preparation, which can solve the problems of metal hydride running out, unstable particles, etc. Uniform, small error effect

Active Publication Date: 2017-12-22
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the resistance of hydrogen to pass through these particles is very high, and after the hydrogen permeation effect is improved, these particles are not stable, and eventually the metal hydride will run out.

Method used

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  • Spherical core-shell type LaNiAl-SiO2 compound hydrogen storage material and preparation method thereof
  • Spherical core-shell type LaNiAl-SiO2 compound hydrogen storage material and preparation method thereof
  • Spherical core-shell type LaNiAl-SiO2 compound hydrogen storage material and preparation method thereof

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preparation example Construction

[0027] The present invention also provides the above-mentioned spherical core-shell LaNiAl-SiO 2 A method for preparing a composite hydrogen storage material, comprising the steps of:

[0028] (1) Preparation of LaNiAl alloy powder: First, the LaNiAl alloy is smelted in a vacuum induction furnace or an electric arc furnace. The general formula of the composition of the LaNiAl alloy is LaNi 5-x al x, where 0≤x≤2. The metal purity used was La: 99.3 wt%, Ni: 99.9 wt%, Al: 99.7 wt%. After smelting, seal the alloy ingot in a vacuum quartz tube, put it into a heat treatment furnace for homogenization treatment, heat it up to 1100°C for 6 hours, and then cool it down with the furnace. Weigh a certain weight of heat-treated LaNiAl alloy ingot and mechanically crush it into millimeter-sized particles, and then perform 20-30 cycles of hydrogen absorption and desorption on a fully automatic Sieverts device, wherein the hydrogen charging pressure is 1-2 MPa, and the water bath temperat...

Embodiment 1

[0035] First, vacuum induction furnace or electric arc furnace is used to smelt LaNi 4.25 Al 0.75 Alloy, the metal purity used is La: 99.3%, Ni: 99.9%, Al: 99.7%. After smelting, seal the alloy ingot in a vacuum quartz tube, put it into a heat treatment furnace for homogenization treatment, heat it up to 1100°C for 6 hours, and then cool it down with the furnace. Weigh a certain weight of heat-treated LaNi 4.25 Al 0.75 The alloy ingots were mechanically crushed into millimeter-sized particles, and then 20 cycles of hydrogen absorption and desorption were performed on the fully automatic Sieverts device. The hydrogen filling pressure was 1 MPa, and the temperature of the water bath was 90 °C. Powdered LaNi 4.25 Al 0.75 The highly active surface of the alloy is passivated, and then the reaction chamber is opened to make the powdered LaNi 4.25 Al 0.75 The alloy is exposed to the air and left to stand for 3 days to further passivate the surface, pass through a 220 mesh siev...

Embodiment 2

[0038] First, vacuum induction furnace or electric arc furnace is used to smelt LaNi 4 Al alloy, the metal purity used is La: 99.3%, Ni: 99.9%, Al: 99.7%. After smelting, seal the alloy ingot in a vacuum quartz tube, put it into a heat treatment furnace for homogenization treatment, heat it up to 1100°C for 6 hours, and then cool it down with the furnace. Weigh a certain weight of heat-treated LaNi 4 Al alloy ingots are mechanically crushed into millimeter-sized particles, and then 30 hydrogen absorption and desorption cycles are performed on the fully automatic Sieverts device. The hydrogen filling pressure is 2 MPa, the water bath temperature is 110 ° C, and finally 1 MPa high-purity argon is filled into the Sieverts device. Pulverized LaNi 4 The highly active surface of Al alloy is passivated, and then the reaction chamber is opened to make the powdered LaNi 4 The Al alloy was exposed to the air and left to stand for 3 days to further passivate the surface. After the sur...

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Abstract

The invention relates to a spherical core-shell type LaNiAl-SiO2 compound hydrogen storage material applicable to hydrogen separation and a preparation method thereof, and belongs to the field of hydrogen storage materials. LaNiAl alloy has a composition general formula of LaNi5-xAlx, wherein x is more than or equal to zero and less than or equal to 2; the spherical material has an outer diameter of 4-6mm, an intermediate main ingredient of LaNiAl alloy, a porous SiO2 appearance and a thickness of 1-2mm. The preparation process of a material comprises the steps of melting and powdering alloy; stirring, mixing and granulating the alloy powder with silica sol; coating with gaseous SiO2; and performing aging and hydrothermal removing treatment. The preparation method of the compound hydrogen storage material has high automatic degree, uniform appearance and size and small airflow resistance, has maximal filling capacity in a reactor, cannot be ground or further pulverized, and cannot block a filter or cause self-compaction, so that toxicity of CO, O2, NH3, H2S and other impure gases for LaNiAl alloy can be greatly reduced, and the service life is greatly prolonged. The spherical core-shell type LaNiAl-SiO2 compound hydrogen storage material can be used in a hydrogen separating process.

Description

technical field [0001] The invention relates to a spherical core-shell type LaNiAl-SiO suitable for hydrogen separation 2 A composite hydrogen storage material and a preparation method thereof belong to the field of hydrogen storage materials. Background technique [0002] Hydrogen storage alloys are capable of reversible reactions with hydrogen and have been partially used in hydrogen separation applications. These alloys can absorb and release large amounts of hydrogen gas at the right temperature and pressure. Using metal hydrides, hydrogen can be economically and efficiently recovered from mixed gases in a simple temperature or pressure increase and decrease process. However, metal hydrides will be accompanied by a significant change in lattice volume during the hydrogen absorption and desorption process, which will generate cyclic internal stress and pulverize the material into micron-sized particles. These pulverized particles are not suitable for use in large separ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B3/00C22C30/00C22C19/03
CPCC01B3/0078C22C19/03C22C30/00Y02E60/32
Inventor 程宏辉徐林华王葵葵刘晶晶韩兴博严凯陈东雷吴瑛秦康生
Owner YANGZHOU UNIV
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