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Method for preparing cerium carbonate and method for preparing cerium oxide powder

A technology of cerium carbonate and powder, which is applied in the field of cerium carbonate powder, can solve the problems of falling into danger, insufficient cerium carbonate yield or productivity, and achieve the effect of improving economy

Active Publication Date: 2011-06-29
LG CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] However, a preparation method for adjusting the type or shape of cerium carbonate through a more simplified process has not been sufficiently developed, and in particular, there is a continuous demand for a method that can more simply prepare cerium carbonate having a hexagonal crystal structure
[0008] In addition, known methods for producing cerium carbonate have disadvantages of insufficient yield or productivity, and there is a problem that when obtaining cerium carbonate of a specific shape or a crystal structure such as a hexagonal structure, a high-pressure reaction is required, but thus falls into a Danger

Method used

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  • Method for preparing cerium carbonate and method for preparing cerium oxide powder
  • Method for preparing cerium carbonate and method for preparing cerium oxide powder
  • Method for preparing cerium carbonate and method for preparing cerium oxide powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0065] Under normal pressure (1 atm) and normal temperature (RT), 43.4 g of cerium nitrate and 18 g of urea (3 equivalents) were mixed, the temperature of the reaction mixture was raised to 140° C., and then kept at this temperature for 16 hours. Then, the reaction mixture was slowly cooled and diluted with water to complete the reaction, and then vacuum-dried at 80° C. for 24 hours to prepare cerium carbonate.

[0066] Carry out XRD analysis and SEM analysis to gained cerium carbonate, and use respectively figure 1 and figure 2 Display its result. These results demonstrate the preparation of orthorhombic and hexagonal cerium carbonate powders.

[0067] And it is assumed that the part where the temperature is kept constant during the heating process is the urea decomposition reaction temperature, which was measured and shown in Table 1 below.

[0068] The final yield of cerium carbonate was then measured and shown in Table 1 below.

Embodiment 2-6

[0070] As shown in Table 1 below, except that the equivalent ratio of cerium nitrate to urea, the heating temperature and the addition of nitric acid were changed, cerium carbonate was prepared in the same manner as in Example 1. As for nitric acid, a 63% aqueous solution of nitric acid was used.

[0071] Carry out XRD analysis to gained cerium carbonate respectively, the result is expressed in figure 1 and the relevant data are shown in Table 1 below. And, the cerium carbonate prepared in embodiment 2-5 carries out SEM analysis respectively and the result is expressed in Figure 3-6 middle.

Embodiment 7

[0073] Cerium carbonate was prepared by the same method as in Example 1 under the reaction conditions shown in Table 1 below, except that the reaction temperature was adjusted to 100° C. and the reaction time was adjusted to 3 hours.

[0074] Gained cerium carbonate is carried out XRD analysis and the result is shown in Figure 7 The relevant data are shown in Table 1 below. It is proved by XRD analysis that the cerium carbonate in Example 7 is a mixture of orthorhombic cerium carbonate and hexagonal cerium carbonate, and the volume ratio of orthorhombic: hexagonal is 2.5:1.

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Abstract

The present invention relates to a method for preparing cerium carbonate which can improve the yield and productivity of cerium carbonate, to cerium carbonate powder, and to a method for preparing cerium oxide powder using the same. The method for preparing cerium carbonate comprises the steps of: mixing cerium precursors and urea; and reacting the cerium precursors and urea by raising the temperature of the mixture to 50-250 DEG C in a solvent-free state.

Description

technical field [0001] The present invention relates to a kind of cerium carbonate preparation method and a kind of cerium oxide powder preparation method, specifically, relate to a kind of cerium carbonate preparation method that improves cerium carbonate yield or productivity, the cerium carbonate powder obtained by this method, and use Describe the method for preparing cerium oxide from cerium carbonate. Background technique [0002] Cerium oxide powder is a highly functional ceramic material widely used as catalysts, phosphorescent agents, cosmetics, abrasives, etc., and recently, it is used as an abrasive for chemical mechanical polishing (CMP) in the field of semiconductor equipment. much attention. [0003] Generally, cerium oxide powder can be prepared by liquid phase method, gas phase method or solid phase method. [0004] The liquid phase method is a method of directly preparing cerium oxide from a metal salt by adding a pH adjuster such as ammonia etc. to a triv...

Claims

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Application Information

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IPC IPC(8): C01F17/00C01B32/60C01F17/235C01F17/247
CPCC01P2002/72C01F17/0043C01F17/005C01P2004/03C01F17/247C01F17/235C01F17/10
Inventor 崔相洵郑相允金正奎金荣大
Owner LG CHEM LTD
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