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Composite ceria-zirconia solid solution and preparation method thereof

A technology of cerium zirconium solid solution and cerium oxide, which is applied in the field of composite cerium zirconium solid solution and its preparation, can solve the problem that oxygen storage capacity and thermal stability, surface area or pore properties cannot be perfectly matched at the same time, and achieve high oxygen storage capacity and thermal stability. Stability, simple preparation method steps, effect of large pore size and pore volume

Active Publication Date: 2016-06-08
GANZHOU BOJING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the co-precipitation method has been widely used due to the advantages of simple process, easy control of conditions, good product uniformity, low production cost, and convenience for industrial production. In some aspects, it cannot meet the needs of automobile exhaust purification catalysts, such as oxygen storage capacity and thermal stability, surface area or pore properties cannot be perfectly matched at the same time, etc.

Method used

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  • Composite ceria-zirconia solid solution and preparation method thereof
  • Composite ceria-zirconia solid solution and preparation method thereof

Examples

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Effect test

Embodiment 1

[0019] A composite cerium-zirconium solid solution, which is compounded by cerium oxide, zirconia and rare earth additives, and its preparation method comprises the following steps: first, add 4ml of nitric acid and 3ml of hydrogen peroxide into 150ml of deionized water to prepare a dissolved acid solution; then Add 2.44 g of cerium carbonate (CeO 2 content 41%), 4.76 grams of zirconium carbonate (ZrO 2 content 42%), 0.245 grams of praseodymium oxide and 0.245 grams of rubidium oxide, stirred and dissolved at 25 ° C to obtain a mixed solution of nitrate A; 7.5 ml of ammonia water and 1 gram of stearic acid were added to 150 ml of deionized In water, fully stir at 40°C to prepare solution B; add nitrate mixed solution A and solution B to the beaker dropwise at a speed of 2.5ml / min, and stir well; the precipitation reaction temperature is maintained at 30°C; After the addition is complete, add 3ml of hydrogen peroxide and continue to stir for 0.5 hours, and then the precipitate...

Embodiment 2

[0021] A composite cerium-zirconium solid solution, which is compounded by cerium oxide, zirconia and rare earth additives, and its preparation method comprises the following steps: first, add 4ml of nitric acid and 3ml of hydrogen peroxide into 150ml of deionized water to prepare a dissolved acid solution; then Add 2.44 g of cerium carbonate (CeO 2 content 41%), 4.76 grams of zirconium carbonate (ZrO 2 Content 42%), 0.245 grams of praseodymium oxide and 0.245 grams of rubidium oxide, stirred and dissolved at 40 ° C to obtain a mixed solution of nitrate A; 7.5 ml of ammonia water, 1.5 grams of stearic acid and 0.5 grams of polyethylene glycol Add it into 150ml of deionized water, stir well at 40°C to prepare solution B; add nitrate mixed solution A and solution B to the beaker at a speed of 2.5ml / min, and stir well; precipitation reaction temperature Maintain at 30°C; after the dropwise addition, add 5ml of hydrogen peroxide and continue to stir for 0.5 hours, then the precip...

Embodiment 3

[0023] Such as Figure 1-2 As shown, a composite cerium-zirconium solid solution is composed of cerium oxide, zirconia and rare earth additives. Its preparation method includes the following steps: first, add 4ml of nitric acid and 3ml of hydrogen peroxide into 150ml of deionized water to prepare dissolved acid solution; then add 2.44 g of cerium carbonate (CeO 2 content 41%), 4.76 grams of zirconium carbonate (ZrO 2 content 42%), 0.245 grams of praseodymium oxide and 0.245 grams of rubidium oxide, stirred and dissolved at 25 ° C to obtain a nitrate mixed solution A; 7.5 ml of ammonia water, 1.5 grams of stearic acid and 0.5 grams of polyethylene glycol Add it into 150ml of deionized water, stir well at 40°C to prepare solution B; add nitrate mixed solution A and solution B to the beaker at a speed of 2.5ml / min, and stir well; precipitation reaction temperature Maintain at 30°C; after the dropwise addition, add 3ml of hydrogen peroxide and continue to stir for 0.5 hours, the...

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Abstract

The invention relates to a composite ceria-zirconia solid solution and a preparation method thereof. The composite ceria-zirconia solid solution is prepared from ceria, zirconia and a rare earth auxiliary through composition and comprises, in percentage by weight, 15%-80% of ceria, 15%-60% of zirconia and 5%-25% of the rare earth auxiliary, wherein the rare earth auxiliary is one or more of lanthanum oxide, praseodymium oxide, rubidium oxide, yttrium oxide, samarium oxide, terbium oxide, dysprosium oxide and erbium oxide. According to the preparation method of the composite ceria-zirconia solid solution, the steps are simple, used raw materials are cheap and easy to obtain, and the prepared composite ceria-zirconia solid solution has high oxygen storage capability, heat stability and other properties. The composite ceria-zirconia solid solution also has larger pore diameters and pore volumes through composite surfactant modification and carbonization and calcination treatment.

Description

technical field [0001] The invention relates to a composite cerium-zirconium solid solution and a preparation method thereof. Background technique [0002] With the rapid development of the automobile industry, automobile exhaust pollution has aroused widespread concern in the society. The use of three-way catalysts (TWC) to catalytically purify automobile exhaust is one of the main ways to solve exhaust pollution. Since the early 1980s, cerium oxide-based high-performance rare earth oxygen storage materials have been widely used in three-way catalysts for automobile exhaust purification, and have become key materials for three-way catalysts, which determine the performance and life of catalysts. The focus of competition among enterprises in the field of automobile exhaust purification catalysts. Due to the poor aging resistance of pure cerium oxide, when the calcination temperature is higher than 850 ° C, it basically loses its oxygen storage capacity. The research result...

Claims

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Application Information

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IPC IPC(8): B01J23/10B01J35/10
CPCB01J23/002B01J23/10B01J35/63B01J35/64
Inventor 熊国槐
Owner GANZHOU BOJING TECH
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