Preparation method of porous aluminum titanate block

A technology of porous aluminum titanate and block, which is applied in the field of preparation of porous aluminum titanate block by sol-gel accompanying phase separation method, can solve the problems of less research on porous materials, etc., and achieves low cost of raw materials and equipment, simple craftsmanship

Active Publication Date: 2015-02-18
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is a relatively complete theoretical system to guide the preparation of monolithic porous blocks, but there are few studies on binary or ternary complex oxide porous materials

Method used

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  • Preparation method of porous aluminum titanate block
  • Preparation method of porous aluminum titanate block
  • Preparation method of porous aluminum titanate block

Examples

Experimental program
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Effect test

Embodiment 1

[0027] Embodiment 1, the preparation method of porous aluminum titanate block, first prepare main raw material according to the following ratio: with 2.90g (0.012mol) aluminum chloride hexahydrate (AlCl 3 ·6H 2 O) as aluminum source, with 2.1mL (0.006mol) tetrabutyl titanate (Ti(OC 4 h 9 ) 4 ) is the titanium source, the ratio of the amount of the above two substances is 2:1, 0.08g of polyoxyethylene (PEO, average molecular weight 100000) is used as the phase separation inducer, and 0.8mL of formamide (FA) is used as the condensation agent. Glue accelerator, with 1.20g of citric acid monohydrate (C 6 h 8 o 7 ·H 2 O) is a chelating agent; Then carry out the following steps:

[0028] 1) At room temperature, respectively dissolve aluminum chloride hexahydrate, citric acid monohydrate, tetrabutyl titanate and polyoxyethylene in 6.5mL solvent (the solvent is composed of deionized water and absolute ethanol at a ratio of 0.3:1 obtained by mixing the volume ratio), stirred to...

Embodiment 2

[0034] Example 2. A method for preparing a porous aluminum titanate block, changing the heat treatment temperature in step 5) of Example 1 from 1100°C to 1300°C, and the rest are the same as in Example 1.

[0035] The appearance of the prepared porous aluminum titanate block remains intact, and there is no obvious crack on the block surface (see figure 1 ); the crystallinity is good, and the phase is a single aluminum titanate. The interior of the porous aluminum titanate block has a co-continuous macropore structure, and the pore structure does not change significantly after heat treatment, and the skeleton becomes smoother and denser (see figure 2 ). The average pore diameter of macropores is 2.8 microns, and the apparent density of the block is about 0.59 g / cm 3 , the calculated porosity is 63.3% (see image 3 ).

Embodiment 3

[0036] Example 3. A method for preparing a porous aluminum titanate block, changing the heat treatment temperature in step 5) of Example 1 from 1100°C to 1400°C, and the rest are the same as in Example 1.

[0037] The phase of the prepared aluminum titanate block is still a single aluminum titanate (the change of the phase with temperature is summarized in Figure 4 middle), but at this time the co-continuous porous structure in some areas collapsed, and cracks appeared in varying degrees on the skeleton (see Figure 5 ). The aluminum titanate block cannot meet the use requirements of the porous block.

[0038] The aluminum titanate block obtained in the above-mentioned Example 1 (heat treatment temperature is 1100°C), the aluminum titanate block obtained in Example 2 (heat treatment temperature is 1300°C), the aluminum titanate block obtained in Example 3 (heat treatment temperature is 1400°C) Body, "change the heat treatment temperature in step 5) of Example 1 from 1100°C ...

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Abstract

The invention discloses a preparation method of a porous aluminum titanate block. The preparation method comprises the following steps: (1) dissolving aluminum chloride hexahydrate, citric acid monohydrate, tetrabutyl titanate and polyoxyethylene in a solvent in sequence at room temperature; (2) cooling a transparent clear solution obtained in the step (1) to -1 DEG C to 1 DEG C, adding formamide, and uniformly stirring; (3) putting a uniform solution obtained in the step (2) into a container, sealing the container, and gelling at 55-70 DEG C for 20-40 minutes; (4) ageing wet gel obtained in the step (3) at 55-70 DEG C for 20-30 hours; (5) performing normal pressure drying on aged gel obtained in the step (4) at 50-70 DEG C for 40-50 hours and performing heat treatment at 1,300-1,350 DEG C for 2-5 hours. The porous aluminum titanate block prepared by the method has the characteristics of continuous macroporous structure, continuous framework, high porosity and the like.

Description

technical field [0001] The invention relates to a preparation method of a porous aluminum titanate block, in particular to a preparation method of a sol-gel accompanying phase separation method for preparing a porous aluminum titanate block, so as to meet the requirements of aluminum titanate materials in filters and catalyst carriers. field applications. Background technique [0002] With the rapid development of modern industry and technology, people's demand for ceramic materials with excellent high temperature resistance and thermal shock resistance is becoming more and more urgent. Aluminum titanate (Al 2 TiO 5 ) Ceramics, as a new type of ceramic material, have close to zero thermal expansion coefficient, low thermal conductivity, high melting point, excellent thermal shock resistance and thermal shock resistance, and are currently the best high temperature and thermal shock resistance among low expansion materials. kind of. Therefore, aluminum titanate has a wide ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/478C04B35/624
Inventor 郭兴忠蔡晓波杨辉刘胜星
Owner ZHEJIANG UNIV
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