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Preparation method of catalysts for oxygen production implemented through decomposition of hydrogen peroxide

A catalyst, hydrogen peroxide technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, oxygen preparation, catalyst carrier, etc. The reliability of the oxygen production system, the separation of the catalyst and the carrier, etc., can improve the lifespan, increase the ability of shock waves, and enhance the mechanical strength.

Inactive Publication Date: 2015-04-15
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, hydrogen peroxide decomposes to produce oxygen bubbles, and the rapid expansion of its volume produces a huge shock wave in the hydrogen peroxide. This shock wave impacts the traditional supported catalyst, which often leads to the detachment of the catalyst and the carrier, seriously affecting the life of the catalyst and the reliability of the oxygen production system.
[0008] At present, oxygen is usually obtained by releasing high-pressure air or oxygen contained in steel cylinders underwater. Compared with hydrogen peroxide oxygen production, the oxygen storage density is low and the equipment is cumbersome. It is not suitable for long-distance underwater vehicles or long-term underwater work. equipment

Method used

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  • Preparation method of catalysts for oxygen production implemented through decomposition of hydrogen peroxide
  • Preparation method of catalysts for oxygen production implemented through decomposition of hydrogen peroxide
  • Preparation method of catalysts for oxygen production implemented through decomposition of hydrogen peroxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: silver loading

[0024] Dissolve silver nitrate in water to prepare 20 milliliters of silver nitrate solution with a concentration of 0.5 wt% and introduce it into a test tube. Immerse a round rod-shaped nickel foam with a hole diameter of 0.5 mm, a diameter of 1 cm and a height of 5 cm in the silver nitrate solution of the test tube. The temperature of the test tube was raised to 40°C, the displacement reaction was carried out for 2 hours, and then cooled to room temperature.

Embodiment 2

[0025] Embodiment two: Nickel re-deposition

[0026] Dissolve silver nitrate in water to prepare 20 ml of silver nitrate solution with a concentration of 3 wt%, and introduce it into a test tube, and immerse a nickel foam sheet with a pore size of 0.1 mm, a length of 10 cm, a width of 2 cm, and a thickness of 1 mm in the silver nitrate solution of the test tube , the temperature of the test tube was raised to 60°C, the displacement reaction was carried out for 1 hour, and then cooled to room temperature.

[0027] Sodium borohydride was dissolved in a sodium hydroxide solution with a concentration of 5 wt% to prepare an alkaline sodium borohydride solution with a concentration of 4 wt%, and 15 ml was introduced into the above-mentioned test tube. Sodium borohydride reduces the Ni ions in the solution to metallic nickel and deposits it on the nickel foam.

Embodiment 3

[0028] Embodiment three: calcining

[0029] Dissolve silver nitrate in water to prepare 20 ml of silver nitrate solution with a concentration of 1 wt%, introduce it into a test tube, immerse the spherical nickel foam with a pore size of 1 mm and a diameter of 1 cm in the silver nitrate solution of the test tube, and raise the temperature of the test tube to 80°C , carried out the displacement reaction for 1.5 hours, and cooled to room temperature.

[0030] Sodium borohydride was dissolved in a sodium hydroxide solution with a concentration of 5 wt% to prepare an alkaline sodium borohydride solution with a concentration of 4 wt%, and 15 ml was introduced into the above-mentioned test tube. Sodium borohydride reduces the Ni ions in the solution to metallic nickel and deposits it on the nickel foam.

[0031] Take out the nickel foam, wash it, and dry it. The sample was placed in a muffle furnace and calcined at 400° C. for 4 hours under the protection of a nitrogen atmosphere t...

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Abstract

The invention relates to catalyst preparation, and aims to provide a preparation method of catalysts for oxygen production implemented through the decomposition of hydrogen peroxide. The method comprises the following steps of: immersing a nickel-foam solid sample into a silver nitrate solution, heating the obtained object, carrying out a replacement reaction, and cooling the obtained product to room temperature; taking an alkaline sodium borohydride solution, reducing nickel ions in the previous solution to metal nickel and depositing the metal nickel to the solid sample; and taking out the solid sample, calcinating the solid sample for 2-5 hours under nitrogen so as to obtain a silver catalyst taking nickel foam as a carrier. According to the invention, micropores of nickel foam are used as oxygen transport channels, so that the service life of the catalyst is greatly prolonged. Meanwhile, because the structure compatibility of nickel and silver is excellent, and silver atoms are dissolved in the crystal structure of nickel so as to form a solid solution, so that the mechanical strength of nickel foam can be enhanced, and the capability of a carrier to resist shock waves produced by the generation of oxygen is increased, thereby greatly improving the stability and reliability of catalysts.

Description

technical field [0001] The invention relates to catalyst preparation, in particular to a preparation method of a catalyst used for decomposing hydrogen peroxide to produce oxygen. Background technique [0002] The function and endurance of an unmanned underwater vehicle depend on its power source. At present, lead-acid batteries and silver-zinc batteries are mainly used as power sources, but their energy density is very low (20~25 Wh kg -1 ), it has been difficult to meet the requirements of unmanned underwater vehicles. Lithium-ion batteries can usually only reach 80~100 Wh kg -1 . Using fuel cells to generate electricity can increase the power density to 250~500 Wh kg -1 , which greatly meets the power requirements of unmanned underwater vehicles. [0003] Usually, the oxygen generator uses air as the raw material, uses pressure swing adsorption to separate the oxygen and nitrogen in the air, and filters out harmful substances in the air, so as to obtain high-concentra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89C01B13/02B01J32/00B01J35/10
Inventor 刘宾虹贺繁楼燚俊冯献中李洲鹏
Owner ZHEJIANG UNIV
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