Rare earth and zirconium doped ceria and preparation method thereof

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

Active Publication Date: 2021-10-12
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 catalyst materials, and in particular relates to rare earth and zirconium-doped ceria and a preparation method thereof. The chemical composition and weight percentage are: 50-95% of cerium oxide, 5-40% of rare earth oxide and 0-10% of zirconia, wherein the rare earth element is one or more of La, Pr, Nd or Y The combination. The invention also provides a preparation method thereof. After the cerium feed solution is added into a precipitant to precipitate, a dispersant is added, washed with water until the conductivity is less than 5ms / cm, and burned to obtain cerium oxide powder; the rare earth feed liquid, zirconium feed liquid and cerium oxide After the powders are mixed, they are dried and burned to obtain oxide powders. The present invention changes the surface properties of the oxide through the doping method, increases the fluidity of lattice oxygen, has a high aging specific surface, is not easy to sinter and agglomerate during use, and greatly improves the oxidation-reduction ability of the cerium oxide-based composite compound; The preparation method is scientific, reasonable, simple and 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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Patent Type & Authority Patents(China)
IPC IPC(8): C01F17/235C01F17/10C01G25/02
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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