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Organic composite porous ceramic material and preparation method thereof

A porous ceramic and organic technology, applied in the field of organic composite porous ceramic materials and their preparation, can solve the problems of slow hydrogen absorption and desorption, poor cycle stability, self-agglomeration of powder, etc., and achieves simple preparation method, excellent adsorption performance, improved The effect of mechanical strength

Active Publication Date: 2020-09-04
贵州群华九九特种陶瓷科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the good fluidity of the hydrogen storage material in the container, during the hydrogen absorption and desorption process, it will flow and accumulate in the hydrogen storage device, resulting in deformation or damage to the container; coordination hydrides and amino compounds are also easy to form during the hydrogen absorption and desorption process The self-agglomeration of powder materials slows down the reaction rate of hydrogen absorption and desorption; the thermal conductivity of hydrogen storage material powder is poor, which may easily cause the rate of hydrogen absorption and desorption to slow down or even stop
The hydrogen storage tanks in the prior art are generally metal tanks. The hydrogen storage material is placed in the metal tank. If the body pressure is too high, the hydrogen storage tank will explode; and because the hydrogen storage tank inhales hydrogen during the heating process, the pressure inside the hydrogen storage tank will be relatively high, and no collisions will occur during transportation, otherwise it will easily cause the hydrogen storage tank to explode and cause harm. safety of people's lives and property
[0005] At present, hydrogen storage alloys and composite hydrogen storage materials are widely used. Hydrogen storage alloys have better heat transfer performance and are not easy to absorb and refine. The capacity is reduced; the hydrogen storage capacity of the composite hydrogen storage material is high, but the hydrogen absorption and desorption temperature is high, and the cycle stability is poor
Chinese invention patent CN108746655A discloses a method for preparing a multi-component hydrogen storage composite material. The multi-component alloy hydrogen storage composite material prepared by this method has a high hydrogen storage density and a low hydrogen absorption and desorption temperature, but the cycle stability is poor, and the hydrogen absorption and desorption The process still needs to be heated
In addition, the hydrogen storage alloy block prepared by hydrogen storage alloy and pore-forming agent is a porous hydrogen storage alloy with simple preparation process, low cost, and simple hydrogen absorption and desorption operation, but its hydrogen storage capacity is low , and not resistant to high pressure, easy to deform

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Example 1: Organic composite porous ceramic material A1

[0031] The preparation method of organic composite porous ceramic material A1 comprises the following steps:

[0032] (1) Modified cellulose: Add the silane coupling agent into the solvent to dissolve, then add an appropriate amount of acetic acid to adjust the pH value to 4, soak the plant cellulose in the solution for 9-12 hours at 60-80°C, take it out, Filter, dry, and ball mill to obtain modified cellulose with a particle size of 2 μm. Wherein the mass ratio of plant cellulose to silane coupling agent is 5:1.

[0033] (2) 10g of silicon dioxide, 5g of aluminum powder, 70g of diatomaceous earth and 15g of modified cellulose were evenly mixed and ground into a mixed powder, then 3g of hydroxymethylcellulose and 120g of water were added to the mixed powder and mixed evenly, React at 60-80° C. for 4-6 hours, and freeze-dry to obtain a porous ceramic precursor. Among them, the average particle diameter of silic...

Embodiment 2

[0038] Embodiment 2: organic composite porous ceramic material A2

[0039] The preparation method of organic composite porous ceramic material A2 comprises the following steps:

[0040] (1) Modified cellulose: Add the silane coupling agent into the solvent to dissolve, then add an appropriate amount of acetic acid to adjust the pH value to 4, soak the plant cellulose in the solution for 9-12 hours at 60-80°C, take it out, Filter, dry, and ball mill to obtain modified cellulose with a particle size of 3 μm. Wherein the mass ratio of plant cellulose to silane coupling agent is 6:1.

[0041] (2) 15g of silicon dioxide, 10g of aluminum powder, 55g of diatomaceous earth and 20g of modified cellulose are uniformly mixed and ground into a mixed powder, then 2g of polyvinyl alcohol and 130g of water are added to the mixed powder and mixed uniformly, at 60 React at -80°C for 4-6 hours, and freeze-dry to obtain a porous ceramic precursor. Among them, the average particle diameter of ...

Embodiment 3

[0045] Embodiment 3: organic composite porous ceramic material A3

[0046] The preparation method of organic composite porous ceramic material A3 comprises the following steps:

[0047] (1) Modified cellulose: Add the silane coupling agent into the solvent to dissolve, then add an appropriate amount of acetic acid to adjust the pH value to 4, soak the plant cellulose in the solution for 9-12 hours at 60-80°C, take it out, Filter, dry, and ball mill to obtain modified cellulose with a particle size of 4 μm. Wherein the mass ratio of plant cellulose to silane coupling agent is 6:1.

[0048] (2) 15g of silicon dioxide, 5g of aluminum powder, 50g of diatomaceous earth and 30g of modified cellulose are uniformly mixed and ground into a mixed powder, then 4g of polyvinyl alcohol and 140g of water are added to the mixed powder and mixed uniformly, at 60 React at -80°C for 4-6 hours, and freeze-dry to obtain a porous ceramic precursor. Among them, the average particle diameter of s...

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Abstract

The invention discloses an organic composite porous ceramic material and a preparation method thereof, and relates to the technical field of porous ceramic processing. The organic composite porous ceramic material disclosed by the invention is composed of silicon dioxide, diatomite, aluminum powder and modified cellulose. The preparation method comprises the following steps: uniformly mixing the components, grinding the mixture into mixed powder, adding a water-soluble adhesive and water into the mixed powder, uniformly mixing, carrying out freeze drying to obtain a porous ceramic precursor, and carrying out high-temperature sintering on the porous ceramic precursor. The organic composite porous ceramic material provided by the invention has very high porosity and uniform pore distribution, and the pore size and shape can be controlled. The organic composite porous ceramic material can also be used for storing hydrogen, has the characteristics of high hydrogen storage capacity, simplehydrogen absorption and desorption operation, high-temperature and high-pressure resistance and the like, is good in cycling stability and can be repeatedly used for multiple times, and the prepared product is high in strength and not easy to deform.

Description

technical field [0001] The invention belongs to the technical field of porous ceramic processing, and in particular relates to an organic composite porous ceramic material and a preparation method thereof. Background technique [0002] Porous ceramic material is a kind of porous ceramic material with open pore size and high open porosity, which is made of corundum sand, silicon carbide, cordierite and other high-quality raw materials as main materials, and is prepared through molding and special high-temperature sintering process. Porous ceramic materials have the advantages of high temperature and high pressure resistance, acid, alkali and organic medium corrosion resistance, good biological inertness, controllable pore structure, high opening porosity, long service life, and good product regeneration performance. Porous ceramic materials are suitable for precision filtration and separation of various media, high-pressure gas exhaust silencer, gas distribution and electroly...

Claims

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Application Information

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IPC IPC(8): C04B35/14C04B38/06C04B38/02C04B35/636C01B3/00
CPCC01B3/0084C04B35/14C04B35/6365C04B38/0645C04B2235/402C04B2235/483C04B2235/606C04B2235/96C04B38/02C04B38/0074C04B38/0054Y02E60/32
Inventor 张南泉张伟群
Owner 贵州群华九九特种陶瓷科技有限公司
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