Preparing method of iolite-base composite ceramic with oxygen-storage function

A technology of composite ceramics and cordierite, which is applied in the preparation of cordierite-based composite ceramics and catalytic carrier materials for automobile exhaust purifiers. It can solve the problems of difficult preparation processes and improve the effect of catalytic purification.

Inactive Publication Date: 2006-02-22
INNER MONGOLIA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high number of coating times, it is quite difficult in the manufacturing process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: Amorphous powder is prepared with the oxide of aluminum, magnesium, silicon, lanthanum, cerium, iron, zirconium, titanium as raw material, aluminum: magnesium: silicon atomic ratio is 3: 1: 6, lanthanum, cerium, iron, The atomic ratio of zirconium and titanium is 0:5:0:1:4, the percentage of the total mass of the oxides of aluminum, magnesium, and silicon to the total mass of the oxides of lanthanum, cerium, iron, zirconium, and titanium is 60:40, After melting at 1600°C, the melt is quenched and rapidly cooled to obtain amorphous particles, which are put into a ball mill for 10 hours to obtain amorphous powder. In the crystalline powder, aluminum:magnesium:silicon is added in the form of oxide, and the atomic ratio of aluminum:magnesium:silicon is 4:2:5, and it is put into a ball mill for 5 hours to obtain the crystalline powder. The mass percentage of amorphous powder and crystalline powder is 10:90. The volume ratio of polystyrene to the mixed powder o...

Embodiment 2

[0015] Embodiment 2: Amorphous powder is prepared with the oxide of aluminum, magnesium, silicon, lanthanum, cerium, iron, zirconium, titanium as raw material, aluminum: magnesium: silicon atomic ratio is 4: 2: 4, lanthanum, cerium, iron, The atomic ratio of zirconium and titanium is 1:10:7:0:1, the percentage of the total mass of the oxides of aluminum, magnesium, and silicon to the total mass of the oxides of lanthanum, cerium, iron, zirconium, and titanium is 50:50, After melting at 1600°C, the melt was quenched and rapidly cooled to obtain amorphous particles, which were put into a ball mill for 5 hours to obtain amorphous powder. In the crystalline powder, aluminum:magnesium is added in the form of chloride; silicon is added in the form of silicon oxide, the atomic ratio of aluminum:magnesium:silicon is 3:3:6, and it is put into a ball mill for 8 hours to obtain the crystalline powder. The mass percentage of amorphous powder and crystalline powder is 20:80. The volume ra...

Embodiment 3

[0016] Embodiment 3: Amorphous powder is prepared with the oxide of aluminum, magnesium, silicon, lanthanum, cerium, iron, zirconium, titanium as raw material, aluminum: magnesium: silicon atomic ratio is 5: 3: 2, lanthanum, cerium, iron, The atomic ratio of zirconium and titanium is 5:12:1:7:0, the percentage of the total mass of oxides of aluminum, magnesium, and silicon to the total mass of oxides of lanthanum, cerium, iron, zirconium, and titanium is 40:60, After melting at 1600°C, the melt was quenched and rapidly cooled to obtain amorphous particles, which were put into a ball mill for 6 hours to obtain amorphous powder. In the crystalline powder, aluminum:magnesium is added in the form of nitrate; silicon is added in the form of silicon oxide, the atomic ratio of aluminum:magnesium:silicon is 3:3:6, and it is put into a ball mill for 8 hours to obtain the crystalline powder. The mass percentage of amorphous powder and crystalline powder is 30:70. The volume ratio of po...

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Abstract

The invention discloses a new cordierite composite ceramic with oxygen-storage capability and preparing method, able to adopt powder sintering process and glass crystallization to prepare it, by critical control of sintering process, able to form rare-earth oxide, titanium oxide, ferric oxide, zirconium oxide, etc on the cordierite substrate, therefore it has oxygen-storage capability (OSC) essential for ternary catalysis and a certain auxiliary catalysis capability, and it can improve the catalytic conversion effect of harmful components such as CO, C-H and NxO. It is applied to prepare catalyst carrier in car tail-gas converter. Its porosity is 30-50%, its thermal expansion coefficient 1.5-3.5X10 to the power -6 / deg.C, its bend strength 15-40MPa and its maximum oxygen storage capacity 0.06mmol / g.

Description

Technical field: [0001] The invention relates to a preparation method of a cordierite-based composite ceramic with an oxygen storage function (OSC), belongs to the field of inorganic materials, and is suitable for preparing catalytic carrier materials for automobile exhaust purifiers. Background technique: [0002] With the rapid increase of car ownership, a large amount of harmful gases and inhalable solid particles emitted by cars have had a bad impact on the atmospheric environment and human health. Installing exhaust gas purifiers to achieve catalytic conversion of harmful gases is considered to be a more effective measure. The exhaust gas purifier is made of honeycomb cordierite ceramics (2MgO2Al 2 o 3 5SiO 2 ) carrier and the catalyst layer coated on it. Since the temperature of the exhaust gas varies greatly, the carrier is required to have a certain strength and a high ability to resist thermal shock. [0003] In the three-way catalytic purification of automobil...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/195C04B38/00C04B35/622B01D53/94B01J21/16
Inventor 史志铭
Owner INNER MONGOLIA UNIV OF TECH
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