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High-oxygen storage capacity Al2O3-CeO2-ZrO2-TiO2 coating material for automobile catalysts and preparation method thereof

A coating material and oxygen storage technology, applied in catalyst protection, chemical instruments and methods, heterogeneous catalyst chemical elements, etc., can solve the problem of high impurity content, poor thermal stability and complex preparation process of cerium-zirconium-based oxygen storage materials and other problems, to achieve the effect of improving activity and thermal stability, reducing production cost and low impurity content

Inactive Publication Date: 2018-06-29
昆明贵研催化剂有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This process uses carbonate as the raw material. Although the cerium-zirconium-based oxygen storage material with better pore structure can be produced, the carbonate is relatively stable and cannot be completely decomposed even at temperatures as high as 1000°C, thus making the cerium-zirconium-based oxygen storage material The impurity content of the material is high and the preparation process is complicated
[0004] The oxygen storage materials disclosed above all have relatively high oxygen storage capacity, but some have high production costs, some have poor thermal stability, and some cannot avoid containing relatively high impurities.
But the car catalyst high oxygen storage capacity AlCeZrTiOx coating material that the present invention relates to and the research of preparation method thereof have not yet been reported

Method used

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  • High-oxygen storage capacity Al2O3-CeO2-ZrO2-TiO2 coating material for automobile catalysts and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] First weigh the CeO-containing 2 Dissolve 25g of cerium nitrate salt in appropriate deionized water, and add Al containing 2 o 3 60g of pseudoboehmite and 5g of nano anatase TiO 2 , add dropwise 2ml hydrogen peroxide (30wt%) after continuing to stir for 30min, and add the ZrO containing ZrO after 5 minutes 2 For 10g of zirconium acetate, keep stirring until the slurry becomes a sol. Finally, the sol was dried at 120°C and calcined at 700°C for 4 hours to obtain AlCeZrTiO with high oxygen storage capacity for automotive catalysts x coating material.

[0021] The AlCeZrTiO x The specific surface area of ​​the coating material is 147.32m 2 / g, the oxygen storage capacity is 537μmol / g.

Embodiment 2

[0023] First weigh the CeO-containing 2 Dissolve 45g of cerium nitrate salt in appropriate deionized water, and add Al containing 2 o 3 40g of pseudoboehmite and 5g of nano anatase TiO 2 , add dropwise 8ml hydrogen peroxide (30wt%) after stirring continuously for 30min, and add ZrO after 5 minutes 2 For 10g of zirconium acetate, keep stirring until the slurry becomes a sol. Finally, the sol was dried at 200°C and calcined at 700°C for 4 hours to obtain AlCeZrTiO with high oxygen storage capacity for automotive catalysts x coating material.

[0024] The AlCeZrTiO x The specific surface area of ​​the coating material is 135.47m 2 / g, the oxygen storage capacity is 701μmol / g.

Embodiment 3

[0026] First weigh the CeO-containing 2 Dissolve 35g of cerium nitrate salt in appropriate deionized water, and add Al containing 2 o 3 50g of pseudoboehmite and 2g of nano anatase TiO 2 , after continuous stirring for 30min, 5ml hydrogen peroxide (30wt%) was added dropwise, and after 5 minutes, ZrO-containing 2 For 13g of zirconium acetate, keep stirring until the slurry becomes a sol. Finally, the sol was dried at 120°C and calcined at 700°C for 4 hours to obtain AlCeZrTiO with high oxygen storage capacity for automotive catalysts x coating material.

[0027] The AlCeZrTiO x The specific surface area of ​​the coating material is 167.656m 2 / g, the oxygen storage capacity is 545μmol / g.

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Abstract

The invention relates to a high-oxygen storage capacity Al2O3-CeO2-ZrO2-TiO2 coating material for automobile catalysts and a preparation method thereof. The oxygen storage material is synthesized fromAl2O3, CeO2, ZrO2 and TiO2 according to a certain proportion by a sol-gel method, and has high specific surface area (about 180m<2> / g) and oxygen storage capacity (about 800Mu mol / g). Moreover, afterthe AlCeZrTiOx coating material involved in the invention is roasted under the high temperature of 1000 DEG C for 4 hours, the specific surface area is still higher than 80m<2> / g, the oxygen storagecapacity is higher than 480Mu mol / g, and the coating material can be used in motor vehicle exhaust purification catalysts. In addition, the invention further provides a preparation method for the oxygen storage material, the preparation method gets rid of the usage of precious metals and macromolecular dispersant, so that the production cost is greatly reduced, and the preparation method has the advantages of simple control process, simple production equipment, environment-friendliness and the like.

Description

technical field [0001] The invention relates to a catalyst with high oxygen storage capacity Al 2 o 3 -CeO 2 -ZrO 2 -TiO 2 (abbreviated as AlCeZrTiOx) coating material and a preparation method thereof, belonging to the technical field of oxygen storage materials. Background technique [0002] With the rapid development of the automobile industry, motor vehicle exhaust has become the most important source of air pollution in cities, and the pollutants are mainly carbon monoxide, hydrocarbons and nitrogen oxides. In the process of automobile exhaust emission, due to the frequent operation of starting, accelerating, braking and other operations of the automobile, the composition of the exhaust gas is complex and changeable, resulting in the random appearance of lean and fuel-rich atmospheres, which increases the difficulty of automobile exhaust purification. Because of its ability to store / release oxygen, the oxygen storage material can adjust the ratio of oxidant and redu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/10B01J33/00B01D53/94B01D53/62B01D53/56B01D53/72
CPCB01D53/945B01J23/002B01J23/10B01D2257/7022B01D2257/502B01D2258/01B01D2257/404B01J2523/00B01J35/61B01J2523/3712B01J2523/31B01J2523/47B01J2523/48
Inventor 顾永万江彩义潘再富冯丰朱敬芳栗云彦刘锋胡晋铨张云峰
Owner 昆明贵研催化剂有限责任公司
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