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Composite, mesohole, three-effect catalysis material contg. zirconium oxide and cerium oxide, and its prepn. method

A catalytic material, zirconia technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, catalyst activation/preparation, chemical instruments and methods, etc., can solve the problem of unsatisfactory low-temperature activity, achieve low price, realize Large-scale production, the effect of large specific surface area

Inactive Publication Date: 2008-12-24
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the low-temperature activity of such catalysts currently used is not ideal, and more precious metals are used

Method used

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  • Composite, mesohole, three-effect catalysis material contg. zirconium oxide and cerium oxide, and its prepn. method
  • Composite, mesohole, three-effect catalysis material contg. zirconium oxide and cerium oxide, and its prepn. method
  • Composite, mesohole, three-effect catalysis material contg. zirconium oxide and cerium oxide, and its prepn. method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The zirconium source is Zr(OC 3 H 7 ) 4 , The cerium source is Ce(NO 3 ) 3 The surfactant is a mixture of P123 and Brij56. According to the formula ratio (weight ratio): 10Zr(OC 3 H 7 ) 4 :12Ce(NO 3 ) 3 :3.2P123:4.8Brij56:100H 2 O; Hydrothermal crystallization treatment at 130℃ for 24 hours; synthesis of a worm-like mesoporous cerium oxide / zirconia composite precursor sample, centrifuged and dispersed in anhydrous ethanol solution, while adding platinum ions (1wt%) ethanol solution, after stirring for 1 hour, ultrasonic treatment for 30 minutes. It was centrifuged again and dried at 100°C for 2 hours. Finally, it is calcined in a muffle furnace to remove the organic surfactant to obtain the prepared ceria / zirconia composite mesoporous catalytic material. The calcining temperature: 500°C; the calcining time is 6 hours. The typical transmission electron microscope photos are as figure 2 shown in b, N 2 Adsorption analysis and pore size distribution such as image 3 , XRD dif...

Embodiment 2

[0036] The proportion of the formula remains the same, and the sample that has not been heat-treated after hydrothermal treatment, the transmission electron microscope picture and the electron diffraction pattern of the corresponding area are as follows figure 2 a, XRD diffraction pattern such as Figure 4 shown in a. It can be seen that the unheated samples also show a uniformly distributed vermicular mesoporous structure, and the composite oxide skeleton structure is in a microcrystalline state.

Embodiment 3

[0038] The proportion of the formula remains unchanged, the sample heat-treated at 900 ℃, the transmission electron microscope picture and the corresponding area electron diffraction pattern are as follows figure 2 c, XRD diffraction pattern such as Figure 4 Shown in d. It can be seen that the uniformly distributed mesoporous structure of the sample after the high temperature heat treatment at 900 ℃ still exists without collapse; at the same time, as the calcination temperature increases, the crystal grains composed of ceria and zirconium oxide gradually grow, and the temperature at 40° The small peak indicates that the crystal grains of the precious metal platinum have gradually grown and the crystals are complete. The transmission electron microscope photos clearly show that the precious metal platinum can be uniformly dispersed on the surface of the composite mesoporous.

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Abstract

The invention relates to a cerium oxide / zirconia composite mesoporous three-effect catalytic material and a preparation method thereof. It belongs to the field of inorganic catalytic materials. The invention is composed of nanocrystalline cerium oxide and nanocrystalline zirconia with a mass content of 15-40%. The inorganic framework with a mesoporous structure has a pore size of 3nm-5nm, narrow pore size distribution, and a worm-like disordered pore structure; zirconium-containing The ionic compound is configured into a 1-3M solution containing zirconium ions; the compound containing cerium ions is configured into a 1-3M solution containing zirconium ions; the surfactant is dissolved in deionized water at a concentration of 1-5M; After hydrothermal treatment, wash, filter, transfer into anhydrous ethanol solution, stir and disperse; add 0.5-5wt% precious metal ion ethanol solution, continue to stir, age and dry, then calcinate at 400-900°C for 4-10 hours for heat treatment or Without heat treatment. The invention can be used to simultaneously purify CO, HC and NOx in automobile tail gas, and has excellent low-temperature activity and thermal stability.

Description

Technical field [0001] The invention relates to a cerium oxide / zirconia composite mesoporous three-way catalytic material used for automobile exhaust gas treatment and a preparation method thereof. It belongs to the field of inorganic catalytic materials. Background technique [0002] The current social progress is accelerating, and the pollution caused by automobiles is getting more serious. Therefore, environmental protection, especially the effective treatment of automobile exhaust, has become a common concern. [0003] Automobile exhaust catalysts are classified into oxidation type, reduction type and three-effect (element) type according to their reaction function. The oxidation catalyst is used to purify CO and HC in the exhaust gas, the reduction catalyst is used to purify NOx, and the three-way catalyst has the functions of the above two catalysts. After the mid-1980s, with the widespread application of electronically controlled fuel injection devices, the three-way catal...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/10B01J21/06B01J35/10B01J37/08B01D53/94
Inventor 陈航榕施剑林严东生
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI