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Preparation technology of Ce-Zr-based oxygen-storage materials

A preparation process and technology for oxygen storage materials, applied in the field of preparation of oxygen storage materials, can solve problems such as increasing production costs and wasting energy, and achieve the effects of improving safety factor, reducing production costs, and being beneficial to large-scale production.

Inactive Publication Date: 2014-08-27
淄博加华新材料资源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In the above invention patents, the heat treatment temperature for the precipitate obtained is at least 100°C, and some of them require high temperature heat treatment for the precipitate, and also require a pressure vessel, which not only wastes energy but also increases production costs

Method used

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  • Preparation technology of Ce-Zr-based oxygen-storage materials
  • Preparation technology of Ce-Zr-based oxygen-storage materials
  • Preparation technology of Ce-Zr-based oxygen-storage materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-3

[0025] The carbonates of cerium, zirconium, lanthanum, yttrium, praseodymium, and neodymium were respectively dissolved in nitric acid until the solution was clear, adjusted according to the distribution, diluted with water to make the oxide mass concentration 150g / L, mixed evenly to obtain a mixed salt solution, added Hydrogen peroxide (the mass ratio of hydrogen peroxide to rare earth oxide is 1.35:1), stir evenly; add surfactant (oleic acid) into the ammonia water, stir evenly, drop the mixed salt solution into the ammonia water until the pH is 9-10 and the precipitation is complete After the end, while maintaining the precipitation temperature at 50 ° C. After the precipitation, the precipitate needs to be kept at 35°C for 2 hours, then washed, burned at 600°C for 10 hours, pulverized, mixed, and aged at 1000°C for 10 hours to obtain an aged product. The specific surface area and oxygen storage capacity data are shown in the table 1. The XRD spectrogram of the aging produ...

Embodiment 4-6

[0029] The carbonates of cerium, zirconium, lanthanum, yttrium, praseodymium, and neodymium were respectively dissolved in nitric acid until the solution was clear. After adjusting according to the distribution, add water to dilute to make the oxide mass concentration 300g / L, mix well to obtain a mixed salt solution, add Proper amount of hydrogen peroxide (the mass ratio of hydrogen peroxide to rare earth oxide is 0.3:1), stir evenly; add surfactant (oleic acid) into the ammonia water, stir evenly, drop the mixed salt solution into the ammonia water until the pH is 9-10 to precipitate Completely end, while maintaining the precipitation temperature at 40 ° C. After the precipitation, the precipitate needs to be kept at 50°C for 0.5 hours, then washed, burned at 800°C for 6 hours, pulverized, mixed, and aged at 1000°C for 10 hours to obtain the aged product. The specific surface area data are shown in Table 2.

[0030] Table 2 embodiment 4-6 specific surface area data table

[...

Embodiment 7-9

[0033] The carbonates of cerium, zirconium, lanthanum, yttrium, praseodymium, and neodymium were respectively dissolved in nitric acid until the solution was clear. After adjusting according to the distribution, add water to dilute to make the oxide mass concentration 20g / L, mix well to obtain a mixed salt solution, add Proper amount of hydrogen peroxide (the mass ratio of hydrogen peroxide to rare earth oxide is 3:1), stir evenly; add surfactant (oleic acid) into the ammonia water, stir evenly, drop the mixed salt solution into the ammonia water until the pH is 9-10 to precipitate Completely end, while maintaining the precipitation temperature at 25 ° C. After the precipitation, the precipitate needs to be kept at 30°C for 4 hours, then washed, burned at 500°C for 4 hours, pulverized, mixed, and aged at 1000°C for 10 hours to obtain the aged product. The specific surface area data are shown in Table 3.

[0034] Table 3 embodiment 7-9 specific surface area data table

[0035]...

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Abstract

The invention relates to a preparation technology of Ce-Zr-based oxygen-storage materials, and belongs to the technical field of oxygen-storage material preparation. The preparation technology of the Ce-Zr-based oxygen-storage materials comprises the steps of material dissolving, mixing, sedimentation, heat insulation treatment, washing, firing and breaking. Carbonate of Ce, Zr and rare earth elements is adopted as raw materials in material dissolving. The rare earth elements comprise two or more kinds of La, Y, Pr and Nd. Heat insulation treatment is carried out when sedimentation is finished, the heat insulation temperature ranges from 30 DEG C to 50 DEG C, and the heat insulation time ranges from 0.5 hour to 4 hours. High-temperature heat treatment and a pressure container are not needed, the aim can be achieved only through low-temperature heat insulation, the safety factor is improved, and production cost is obviously lowered. The preparation technology is easy to operate and control, and large-scale production is facilitated. The specific surface area of a fresh product manufactured through the preparation technology is still higher than 45 m<2> / g after aging is carried out for 10 hours at 1000 DEG C, and the oxygen storage amount is higher than 700 micro-mol / g.

Description

technical field [0001] The invention relates to a preparation process of a cerium-zirconium-based oxygen storage material, belonging to the technical field of oxygen storage material preparation. Background technique [0002] Due to their unique catalytic properties, rare earth composite oxides are almost "pervasive" in the fields of petroleum, chemical industry, environmental protection, and fuel cells. my country is in a period of great development of the automobile industry. In view of the pollution hazards caused by automobile exhaust, it is urgent to realize the control and treatment of automobile exhaust. The use of cerium-zirconium-based automobile exhaust catalytic materials for automobile exhaust purification not only protects the environment, but also expands the application of rare earths. , is an important way to transform the advantages of rare earth resources into economic advantages. [0003] For this reason, scholars at home and abroad have developed various ...

Claims

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Application Information

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IPC IPC(8): B01J23/12B01D53/94
Inventor 陈孝伟黄贻展王忠徐清辉陈双华
Owner 淄博加华新材料资源有限公司
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