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A rare earth composite oxide with high heat resistance and its preparation method

A rare earth oxide and rare earth composite technology, applied in the preparation/processing of rare earth metal compounds, rare earth metal oxides/hydroxides, lanthanide oxides/hydroxides, etc., can solve the problem of poor thermal stability, specific surface area, etc. low problems, to achieve the effects of high thermal stability, large specific surface area, and adjustable pore size distribution

Active Publication Date: 2021-09-03
JIANGMEN KANHOO IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the specific surface area of ​​the material is relatively low and the thermal stability is poor.

Method used

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  • A rare earth composite oxide with high heat resistance and its preparation method
  • A rare earth composite oxide with high heat resistance and its preparation method
  • A rare earth composite oxide with high heat resistance and its preparation method

Examples

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Embodiment 1

[0033] The rare earth composite oxide in this embodiment includes the following components in parts by weight: 60 parts of zirconia, 30 parts of ceria, 2 parts of lanthanum oxide, and 8 parts of yttrium oxide.

[0034] The preparation method of the rare earth composite oxide of this embodiment is:

[0035] (1) Add potassium sulfate to the zirconium nitrate solution with a mass fraction of 2wt%, and the sulfate group is 23% of the weight of zirconium dioxide; stir until the potassium sulfate solid is completely dissolved, heat the solution to 100°C and keep it warm for 60 minutes to obtain the basic formula Zirconium sulfate sol;

[0036] (2) adding mass fraction to the basic zirconium sulfate sol of step (1) gained is the potassium sulfate solution of 5wt%, and the sulfate radical is 12% of zirconium dioxide weight; Slaking 60min at 100 DEG C, obtains basic zirconium sulfate Precursor;

[0037] (3) cooling the basic zirconium sulfate precursor obtained in step (2) to 50° C.,...

Embodiment 2

[0042] The rare earth composite oxide in this embodiment includes the following components in parts by weight: 60 parts of zirconia, 30 parts of ceria, 2 parts of lanthanum oxide, and 8 parts of yttrium oxide.

[0043] The preparation method of the rare earth composite oxide of this embodiment is:

[0044] (1) Add potassium sulfate to the zirconium nitrate solution with a mass fraction of 2 wt%, and the sulfate radical is 8% of the weight of zirconium dioxide; stir until the potassium sulfate solid is completely dissolved, heat the solution to 100°C and keep it warm for 120 minutes to obtain the basic formula Zirconium sulfate sol;

[0045] (2) adding mass fraction to the basic zirconium sulfate sol of step (1) gained is the potassium sulfate solution of 5wt%, and the sulfate group is 46% of zirconium dioxide weight; Slaking 60min at 100 DEG C, obtain basic zirconium sulfate Precursor;

[0046] (3) cooling the basic zirconium sulfate precursor obtained in step (2) to 50° C.,...

Embodiment 3

[0051] The rare earth composite oxide in this embodiment includes the following components in parts by weight: 90 parts of zirconia, 5 parts of ceria, and 5 parts of yttrium oxide.

[0052] The preparation method of the rare earth composite oxide of this embodiment is:

[0053] (1) Add zirconium sulfate to the zirconium oxychloride solution with a mass fraction of 5wt%, and the sulfate radical is 16% of the weight of zirconium dioxide; stir until the zirconium sulfate solid is completely dissolved, heat the solution to 95° C. and keep it warm for 60 minutes to obtain Basic zirconium sulfate sol;

[0054] (2) adding mass fraction to the basic zirconium sulfate sol of step (1) gained is the sodium sulfate solution of 20wt%, and the sulfate group is 24% of zirconium dioxide weight; Slaking 60min at 100 DEG C, obtain basic zirconium sulfate Precursor;

[0055] (3) cooling the basic zirconium sulfate precursor obtained in step (2) to 50° C., adding cerium chloride and yttrium chl...

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Abstract

The invention provides a rare earth composite oxide with high heat resistance and a preparation method thereof, belonging to the field of rare earth materials. The rare earth composite oxide of the present invention comprises the following components by weight: 50-90 parts of ZrO 2 , 5-40 parts of CeO 2 , 5-20 parts of rare earth oxides other than cerium oxide and 0-10 parts of transition metal oxides. The present invention controls the particle size, pore size distribution, specific surface area and pore volume of the rare earth composite oxide by adding sulfate in two steps in the early stage and adding the structure regulator in the later stage, and simultaneously increases the thermal stability of the rare earth composite oxide.

Description

technical field [0001] The invention relates to a rare earth composite oxide with high heat resistance and a preparation method thereof, belonging to the field of rare earth materials. Background technique [0002] Rare earth composite oxides are multifunctional materials with unique structures and properties, and are widely used in industrial fields such as ceramic materials, catalytic materials, and electrolyte materials. Catalyst materials and fuel cell electrolyte materials need to work under high temperature conditions, which have high requirements on the heat resistance of rare earth composite oxides. In the field of volatile organic compound treatment, rare earth composite oxides are usually used as the carrier of noble metals and oxygen storage materials, and the hydrocarbons are burned flamelessly at 250-500 °C for a long time. Rare earth composite oxides need to have a hierarchical pore structure and a large specific surface area to improve the dispersive loading ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G25/02C01F17/235C01F17/229C01F17/218C01F17/10C01G45/02C01G3/02
CPCC01G3/02C01G25/02C01G45/02C01P2004/61C01P2004/82C01P2006/12C01P2006/13C01P2006/14C01P2006/16C01F17/10C01F17/218C01F17/229C01F17/235
Inventor 谭志伟黄英强陈涛谭程校梁景棠万国江
Owner JIANGMEN KANHOO IND
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