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Porous cordierite block preparation method

A technology of cordierite and block, which is applied in the field of preparation of porous cordierite block by epoxide-controlled sol-gel with phase separation method, which can solve complex processes such as co-hydrolysis sol-gel transition and phase separation , difficult to control and other problems, to achieve the effect of controlling the aperture size, low equipment and simple process

Inactive Publication Date: 2014-07-16
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For the preparation of porous blocks of one-component systems, scholars at home and abroad have established a relatively complete theoretical system, but there are few reports on two-component or three-component systems, such as SiO 2 -Al 2 o 3 , CaO-Al 2 o 3 , MgO-Al 2 o 3 -SiO 2 , and research on complex oxide porous materials such as mullite, mayenite, and cordierite
Because compared with the one-component system, the processes of co-hydrolysis, formation of homogeneous complex sol, sol-gel transition and phase separation are more complicated and difficult to control in the binary or ternary system.

Method used

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  • Porous cordierite block preparation method
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  • Porous cordierite block preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1, a preparation method of a porous cordierite block, first prepare the main raw material according to the following ratio: with 0.80g of magnesium chloride hexahydrate (MgCl 2 ·6H 2 O) as the source of magnesium, with 2.0 g of aluminum chloride hexahydrate (AlCl 3 ·6H 2 O) as the aluminum source, 0.96ml of orthomethyl silicate (TMOS) as the silicon source, 1.5g of polyacrylamide (PAAm, with an average molecular weight of 10000) as the phase separation inducer, and 0.6ml of propylene oxide ( PO) is the gel accelerator; the following steps are performed in sequence:

[0028] 1) At room temperature, first dissolve 0.80g of magnesium chloride hexahydrate, 2.0g of aluminum chloride hexahydrate and 1.5g of polyacrylamide in a solvent consisting of 3.0ml of deionized water and 2.8ml of absolute ethanol, and then Slowly add 0.96ml of methyl orthosilicate dropwise under stirring (the dropping time is about 2 minutes); after the dropwise addition is completed, plac...

Embodiment 2

[0034] Embodiment 2, a kind of preparation method of porous cordierite block,

[0035] Change the heat treatment temperature in Step 5) of Example 1 from 800°C to 1300°C, and the rest are the same as in Example 1.

[0036] The prepared porous cordierite block remains intact, has no cracks on the surface of the block, and has only a small amount of shrinkage; the crystallinity is good, and the phase is a single α-type cordierite. The interior of the porous cordierite block has a co-continuous macroporous structure and a complete framework (see figure 1 ), the average pore diameter of macropores is 5 microns, and the apparent density of the block is about 0.82g / cm 3 , the calculated relative density is 32%, and the porosity is 54%. The N of the porous cordierite block 2The adsorption-desorption curve is H3 type, indicating that the block has a certain number of slit-like mesopores due to its skeleton structure, so the cordierite block has a hierarchical porous structure.

[...

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Abstract

The present invention discloses a porous cordierite block preparation method, which sequentially comprises: 1) at a room temperature, dissolving magnesium chloride hexahydrate, aluminum chloride hexahydrate and polyacrylamide in a solvent, adding tetramethyl orthosilicate in a dropwise manner, and continuously carrying out a stirring reaction for 50-70 min at a temperature of 50-70 DEG C; 2) naturally cooling the transparent clear solution obtained in the step 1) to a room temperature, adding propylene oxide, and uniformly stirring; 3) placing the homogeneous solution obtained in the step 2) into a container, sealing, and carrying out gelation for 3-5 min at a temperature of 35-45 DEG C; 4) placing the wet gel obtained in the step 3) in an environment with a temperature of 35-45 DEG C, and aging for 60-80 h; and 5) placing the aged gel obtained in the step 4) in an environment with a temperature of 50-70 DEG C, carrying out normal pressure drying for 72-96 h, and carrying out a heat treatment for 4-6 h at a temperature of 900-1300 DEG C. The porous cordierite block prepared by using the preparation method has characteristics of porous structure, high porosity and the like.

Description

technical field [0001] The invention relates to a method for preparing a porous cordierite block, in particular to a method for preparing a porous cordierite block by epoxide-controlled sol-gel accompanied by phase separation. Background technique [0002] Cordierite (usually composed of 2MgO 2Al 2 o 3 ·5SiO2 2 ) is MgO-Al 2 o 3 -SiO 2 A crystal in the ternary system. Because cordierite has a low thermal expansion coefficient and dielectric constant, good thermal shock resistance, fire resistance and mechanical properties, it is used in kiln materials, high-temperature gas and liquid filter materials, automobile exhaust catalysis, purification carriers and electronic packaging. Materials and so on have important application prospects. [0003] Porous cordierite with controllable pore structure has become a rapidly developing cordierite material, which can be used as particle filter, catalyst carrier, thermal insulator insulation material, etc., and has good stability ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B35/195C04B35/622
Inventor 郭兴忠蔡晓波宋杰杨辉
Owner ZHEJIANG UNIV
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