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Rare earth and zirconium doped cerium dioxide and preparation method thereof

A technology of ceria and cerium oxide, which is applied in the field of rare earth and zirconium-doped ceria and its preparation, can solve the problems of high requirements for equipment conditions and harsh calcination conditions, so as to prevent sintering and agglomeration and improve redox ability , the effect of increasing liquidity

Active Publication Date: 2019-05-17
淄博加华新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This patent requires two-step calcination, and the calcination conditions are relatively harsh, and the equipment conditions are high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The rare earth and zirconium-doped cerium oxide involved in this embodiment, the chemical composition and weight percentage are:

[0033] 55% cerium oxide, 19% praseodymium oxide, 20% neodymium oxide and 6% zirconium oxide.

[0034] Its preparation method is as follows:

[0035] (1) After adding an appropriate amount of pure water into the material tank, dissolve ammonium cerium nitrate to make it clear, and the ratio of acidity to concentration is 1.0. Add the cerium feed liquid to the blending tank, add pure water to dilute the feed liquid concentration to 0.55mol / L, add ammonium carbonate, control the ratio of feed liquid acidity to concentration at 1.3, add pure water to dilute the feed liquid concentration to 0.28mol / L .

[0036] (2) Heat the feed liquid to 115°C, keep it warm for 4 hours, and beat the feed liquid to the sedimentation tank after cooling down.

[0037] (3) Add ammonium carbonate aqueous solution to the feed liquid for precipitation, and control p...

Embodiment 2

[0046] The rare earth and zirconium-doped cerium oxide involved in this embodiment, the chemical composition and weight percentage are:

[0047] 76% cerium oxide, 9% lanthanum oxide, 5% yttrium oxide and 10% zirconium oxide.

[0048] (1) Put the hydrogen peroxide into the blending tank, then add Ce(NO 3 ) 3 Put the feed liquid into the blending tank, let it stand for 1 hour, then stir for 1 hour, the concentration is 3.0mol / L, and the acidity is 0.5N. Add the cerium feed liquid to the blending tank, add pure water to dilute the feed liquid concentration to 2.0mol / L, add ammonium bicarbonate, control the ratio of feed liquid acidity to concentration at 0.05, add pure water to dilute the feed liquid concentration to 0.05mol / L L.

[0049] (2) Heat the feed liquid to 85°C, keep it warm for 20 hours, and beat the feed liquid to the precipitation tank after cooling down.

[0050] (3) Add ammonium carbonate aqueous solution to the feed liquid for precipitation, and control pH=10....

Embodiment 3

[0059] The rare earth and zirconium-doped cerium oxide involved in this embodiment, the chemical composition and weight percentage are:

[0060] 88% cerium oxide, 10% lanthanum oxide and 2% neodymium oxide.

[0061] (1) After adding nitric acid into the material tank, start stirring, then put in cerium hydroxide, raise the temperature to 105°C, and keep it warm for 3 hours to obtain Ce(NO 3 ) 4 Feed liquid; Wherein, the mol ratio of nitric acid and cerium hydroxide is 6.5:1, Ce(NO 3 ) 4 The concentration of the feed liquid is 1.5mol / L, and the ratio of acidity to concentration is 4.5. Add the cerium feed liquid to the blending tank, add pure water to dilute the feed liquid concentration to 1.0mol / L, add ammonium carbonate, control the ratio of feed liquid acidity to concentration at 0.5, add pure water to dilute the feed liquid concentration to 0.15mol / L .

[0062] (2) Heat the feed liquid to 105°C, keep it warm for 8 hours, and beat the feed liquid to the sedimentation t...

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PUM

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Abstract

The invention belongs to the technical field of a catalyst material, and particularly relates to rare earth and zirconium doped cerium dioxide and a preparation method thereof. The rare earth and zirconium doped cerium dioxide is prepared from the following chemical ingredients in percentage by weight: 50 to 95 percent of cerium oxide, 5 to 40 percent of rare earth oxide and 0 to 10 percent of zirconium oxide, wherein a rare earth element is one or combination of serval kinds of elements from La, Pr, Nd or Y. The invention also provides the preparation method of the rare earth and zirconium doped cerium dioxide; after precipitating agents are added into cerium material liquid for precipitation; dispersing agents are added; water washing is performed until the electrical conductivity is smaller than 5ms / cm; firing is performed to obtain cerium oxide powder; rare earth material liquid, zirconium material liquid and cerium oxide powder are mixed; then, drying and firing are performed to obtain oxide powder. By a doping method, the surface property of oxide is changed; the flowability of lattice oxygen is improved; the aging specific surface is high; in the use process, sintering agglomeration cannot easily occur; the oxidation reduction capability of a cerium oxide based compound is greatly improved; the preparation method is scientific, reasonable and simple and is easy to implement.

Description

technical field [0001] The invention belongs to the technical field of catalyst materials, and in particular relates to rare earth and zirconium-doped ceria and a preparation method thereof. Background technique [0002] As an important rare earth metal oxide, ceria is widely used in polishing materials, ultraviolet absorbers, optical glass components, ceramic additives, solid fuel cells and catalysts. Because of its oxygen vacancies, ceria has good oxygen storage and release capacity and redox capacity, and has a wide range of application markets in the field of automobile exhaust catalysis. By doping, increasing the mobility of lattice oxygen can improve its redox performance. Among them, the study of CeZr composite compounds is the most extensive. [0003] CN101400609B: Compositions according to the invention based on oxides of zirconium and cerium have a cerium oxide content of up to 50% by weight. It is prepared by forming an aqueous mixture comprising compounds of z...

Claims

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Application Information

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IPC IPC(8): C01F17/00C01G25/02
Inventor 黄贻展马宝华尹鹏王忠
Owner 淄博加华新材料有限公司
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