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Porous material with whiskers or rod crystals in apertures and preparation method thereof

A porous material and whisker technology, which is applied in the field of material synthesis and processing, can solve the problems that it is difficult to meet the specific surface area of ​​the vehicle exhaust purifier carrier and good catalytic conversion effect, so as to improve the dispersion and catalytic conversion effect, low cost, The effect of simple process

Active Publication Date: 2013-11-06
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

but pure Al 2 TiO 5 The wall surface of ceramic material is relatively smooth, which is difficult to meet the requirements of high specific surface area and good catalytic conversion effect required by the carrier of automobile exhaust gas purifier when loading catalyst

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Porous composite material preparation method of the present invention is as follows:

[0021]The first step: prepare industrially pure TiO 2 、Al 2 o 3 Powder raw materials, pore-forming agent urea particles and Al ingots, in which TiO 2 、Al 2 o 3 The particle size of the powder is 200 mesh, and the particle size of urea is 2-3 mm.

[0022] Step Two: Al 2 TiO 5 Sintering Synthesis of Porous Materials

[0023] TiO 2 、Al 2 o 3 Powder according to molar ratio TiO 2 :Al 2 o 3 =1:1 (mol) weighing, according to the volume ratio of 50%, measure the urea granules, mix them evenly, put them into the mold, and use the molding method to press into a cylindrical compact under 200MPa pressure; then put the compact Put it into a resistance furnace, heat it to 300°C and keep it for 1.5 hours, and the urea particles will be completely volatilized; put the green compact into a resistance furnace, and sinter at 1400°C for 3 hours. 2 TiO 5 porous material.

[0024] Step Th...

Embodiment 2

[0029] The difference from Example 1 is that the pore-forming agent urea volume ratio is 60%, and the porous Al 2 TiO 5 The material is immersed in the pure Al melt and kept for 8 minutes, the thickness of the aluminum film is about 25 μm, heated and oxidized for 40 minutes, the Al in the hole 2 o 3 The radial size of TiAl and TiAl rods is about 80nm, and the length is about 1.5μm. The pore diameter of the porous material is 2.2-3.3mm, the porosity is 68.7%, and the compressive strength is 6.2MPa.

Embodiment 3

[0031] The difference from Example 1 is that the volume ratio of the pore-forming agent urea is 70%, the compact is sintered at 1500°C for 3 hours, and the porous Al 2 TiO 5 The material is immersed in pure Al melt and kept for 8 minutes, the thickness of the aluminum film is about 25 μm, heated and oxidized for 25 minutes, the Al in the hole 2 o 3 The radial dimension of TiAl whiskers is about 70nm, and the length is about 0.8μm. The pore diameter of the porous material is 2.2-3.3mm, the porosity is 71.4%, and the compressive strength is 5.3MPa.

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PUM

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Abstract

A porous material with whiskers or rod crystals in apertures. The preparation method of the porous material comprises steps of: taking TiO2 and Al2O3 as raw materials and urea as a pore-forming agent, and sintering to obtain a Ti2AlO5 porous material; then immersing the porous material into pure Al melt under high temperature; and eventually forming the porous material with Al2O3 and TiAl whiskers or rod crystals grown on walls of apertures. The porous material provided by the invention has low cost and simple process, and is favorable to improve dispersion and catalytic conversion efficiency of catalyst and endowed with large performance regulating range. The porous material can be used as a carrier and a filtering body in catalysis and environmental purification.

Description

technical field [0001] The present invention relates to a kind of porous material and its preparation technology, especially a kind of Ti with whisker or rod crystal in the hole 2 AlO 5 The invention relates to a matrix porous composite material and a preparation method thereof, which belong to the field of material synthesis and processing. Background technique [0002] Today, reducing vehicle exhaust emissions and protecting the environment is the focus of attention worldwide. At present, the catalyst carrier materials used for the purification of automobile exhaust gas mainly include ceramics and metals. In order to immobilize the catalyst, a layer of γ-Al with high specific surface area is usually uniformly coated on the surface of the carrier 2 o 3 coating, and then the precious metal active catalyst components are supported on the surface. For metal supports, because γ-Al 2 o 3 The thermal expansion coefficient of the coating and the metal substrate is quite dif...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/00C04B41/88
Inventor 崔洪芝徐国刚吴杰曹丽丽姜琳
Owner SHANDONG UNIV OF SCI & TECH
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