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A kind of micron cerium oxide particles with multi-core co-shell structure and preparation method thereof

A technology of nano-cerium oxide and cerium oxide, which is applied in chemical instruments and methods, catalyst activation/preparation, cerium oxide/cerium hydroxide, etc., can solve problems such as limiting the application of cerium oxide materials, poor sulfur resistance, and catalyst deactivation. Achieve the effects of good hydrothermal stability, high mechanical strength and large specific surface area

Active Publication Date: 2019-05-14
RARE EARTH CATALYSIS INNOVATION RES INST (DONGYING) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] 3) Poor sulfur resistance, long-term exposure to sulfur-containing atmosphere will lead to catalyst deactivation
[0008] The above problems severely limit the application of cerium oxide materials in the field of catalytic aftertreatment of exhaust gas, including stationary and mobile sources.

Method used

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  • A kind of micron cerium oxide particles with multi-core co-shell structure and preparation method thereof
  • A kind of micron cerium oxide particles with multi-core co-shell structure and preparation method thereof
  • A kind of micron cerium oxide particles with multi-core co-shell structure and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0060] Micron cerium oxide particles C1 with a multi-core co-shell structure were prepared by the following steps:

[0061] A. Make the cerium salt solution react with the precipitating agent to generate a suspension, adjust the pH value of the suspension, pass air into the generated suspension to oxidize, and obtain a liquid phase dispersion system of the nano-cerium oxide precursor; optionally , adding an organic additive to the liquid phase dispersion system of the nano-cerium oxide precursor;

[0062] B. Spray-drying and roasting the liquid phase dispersion system of the nano-cerium oxide precursor to obtain the embryo body of nano-cerium oxide crystal grain nuclei aggregates;

[0063] C. Dispersing the nano-cerium oxide grain nucleus aggregate embryo body into a solvent to obtain a suspension and adding a cerium salt solution and a precipitant to the suspension to deposit around the nano-cerium oxide grain nucleus aggregate Encapsulation reaction to obtain a second suspe...

Embodiment 5-8

[0070] Micron cerium oxide particles C2 with multi-core co-shell structure are prepared by the following steps:

[0071] A. make the cerium salt solution react with the precipitating agent to generate a suspension, adjust the pH value of the suspension, pass air into the generated suspension to oxidize, and obtain the liquid phase dispersion system of the nano-cerium oxide precursor;

[0072] B. adding organic auxiliary agent and cerium salt solution in the liquid phase dispersion system of described nanometer cerium oxide precursor, obtains the uniformly dispersed liquid phase dispersion system;

[0073] C. Spray drying and calcining the homogeneously dispersed liquid phase dispersion system to obtain micron cerium oxide particles with a multi-core co-shell structure. The micron cerium oxide particles with multi-core co-shell structure prepared by this method were named C2.

[0074] The specific experimental conditions are shown in Table 2:

[0075] Table 2: Preparation con...

Embodiment 9-12

[0078] Micron cerium oxide particles C3 with a multi-core co-shell structure are prepared by the following steps:

[0079] A. make cerium salt solution and precipitating agent react to generate suspension, wherein said cerium salt solution and / or precipitating agent contain organic auxiliary agent, and wherein said cerium salt is stoichiometric excess relative to precipitating agent; Adjust The pH value of the suspension is oxidized by introducing air into the generated suspension to obtain a liquid phase dispersion system of the nano-cerium oxide precursor;

[0080] B. Spray-drying and calcining the liquid-phase dispersion system of the nano-cerium oxide precursor to obtain micro-cerium oxide particles with a multi-core co-shell structure. The micron cerium oxide particles with multi-core co-shell structure prepared by this method were named C3.

[0081] The specific experimental conditions are shown in Table 3:

[0082] Table 3: Preparation conditions of Examples 9-12

[...

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Abstract

The invention relates to a micron cerium oxide particle with a multi-core common-shell structure, which comprises: a cerium oxide shell layer, the shell layer is composed of crystalline and / or amorphous nano-cerium oxide particles; and a cerium oxide particle located inside the shell layer Numerous aggregates of nano-cerium oxide crystal grains. The invention also relates to a preparation method of micron cerium oxide particles with a multi-core common-shell structure. The supported catalyst based on the micron cerium oxide particles of the present invention has good hydrothermal stability, good sulfur resistance and the active component of the supported catalyst is not easy to be embedded. It has a good application prospect.

Description

technical field [0001] The invention relates to the technical field of inorganic advanced nano-micron materials, in particular to the technical field of catalyst carriers. Background technique [0002] Cerium oxide is an important rare earth oxide. As a catalyst carrier and carrier additive, it has many excellent properties and has been fully affirmed in catalytic research. In subsequent studies, it was found that cerium oxide, with its good oxygen storage and release performance and strong redox performance between trivalent cerium ions and tetravalent cerium ions, was used as a catalyst carrier in oxidation reactions, methanol cracking and nitrogen Its unique advantages are shown in reactions such as the reduction of oxides. [0003] The physical and chemical properties of cerium oxide greatly depend on its own microstructure, such as scale, morphology, specific surface area, etc. The cerium oxide material with micro-nano hierarchical porous structure can not only meet th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F17/00B01J23/10C01F17/235
CPCB01J37/033B01J37/20B01J23/34B01J23/63B01D53/945B01J27/04B01J27/045B01J37/0018B01J37/0045B01J37/0072B01J2523/00C01P2002/72C01P2004/03C01P2004/62B01J37/035B01J23/10B01J37/08C01P2004/32C01P2004/50C01P2004/61C01P2004/64C01P2004/84C01P2006/12C01F17/235B01J35/397B01J35/19B01J35/30B01J35/23B01J35/40B01J35/51B01J35/613B01J35/615B01J35/635B01J35/633B01J35/647B01J2523/3712B01J2523/824B01J2523/72B01J37/0221B01J37/0236B01J37/031C01P2002/60
Inventor 沈美庆王军王建强魏光曦
Owner RARE EARTH CATALYSIS INNOVATION RES INST (DONGYING) CO LTD
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