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Preparation method of Fe2O3/CeO2/NiO core-shell structural microspheres

A core-shell structure, fe2o3 technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, chemical/physical processes, etc., can solve problems such as regulation and control without structure and morphology

Active Publication Date: 2013-12-18
徐州康翔精密制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the multi-element metal oxide catalyst materials reported in the literature are composite (or mixed) metal oxides prepared by co-precipitation and impregnation methods, without adjusting the structure and morphology.

Method used

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  • Preparation method of Fe2O3/CeO2/NiO core-shell structural microspheres
  • Preparation method of Fe2O3/CeO2/NiO core-shell structural microspheres
  • Preparation method of Fe2O3/CeO2/NiO core-shell structural microspheres

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Embodiment 1

[0021] a kind of Fe 2 o 3 / CeO 2 / Ni(OH) 2 The preparation method of core-shell microspheres is characterized in that the method comprises the following steps:

[0022] (1) Nano iron oxide (Fe 2 o 3 ) preparation of microspheres

[0023] 2.2mmol ferric chloride hexahydrate (FeCl 3 ·6H 2 O), 0.7mmol iron nitrate (Fe(NO 3 ) 3 and 0.6g of PVP were dissolved in deionized water, stirred for 10min to dissolve completely, then transferred to a high-pressure reactor, sealed, reacted at 150°C for 16h, took out the reactor, and cooled the system to room temperature naturally. Centrifuge, pour off the upper liquid, and repeatedly wash the obtained precipitate with water to obtain Fe 2 o 3 Microsphere samples.

[0024] (2) Fe 2 o 3 / CeO 2 Preparation of composite microspheres

[0025] Fe 2 o 3 Disperse the sample in water, add 0.13mmol cerium ammonium nitrate, 0.5mmol urea, 0.6g PVP, react at 90°C for 24h, cool and centrifuge to obtain Fe 2 o 3 / CeO 2 Composite micros...

Embodiment 2

[0031] a kind of Fe 2 o 3 / CeO 2 / Ni(OH) 2 The preparation method of core-shell microspheres is characterized in that the method comprises the following steps:

[0032] (1) Nano iron oxide (Fe 2 o 3 ) preparation of microspheres

[0033] 2.2mmol ferric chloride hexahydrate (FeCl 3 ·6H 2 O), 0.7mmol iron nitrate (Fe(NO 3 ) 3 and 0.6g of PVP were dissolved in deionized water, stirred for 10min to dissolve completely, then transferred to a high-pressure reactor, sealed, reacted at 150°C for 16h, took out the reactor, and cooled the system to room temperature naturally. Centrifuge, pour off the upper liquid, and repeatedly wash the obtained precipitate with water to obtain Fe 2 o 3 Microsphere samples.

[0034] (2) Fe 2 o 3 / CeO 2 Preparation of composite microspheres

[0035] Fe 2 o 3 Disperse the sample in water, add 0.2mmol cerium ammonium nitrate, 1.5mmol urea, 0.6g polyvinylpyrrolidone, react at 85°C for 24h, and centrifuge to obtain Fe 2 o 3 / CeO 2 Compo...

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Abstract

The invention discloses a preparation method of Fe2O3 / CeO2 / Ni(OH)2 core-shell structural microspheres. The preparation method comprises the following steps of: dissolving ferric chloride hexahydrate, ferric nitrate and polyvinylpyrrolidone (PVP) into deionized water; reacting at a hydrothermal condition to obtain egg-shaped alpha-Fe2O3 microspheres; dispersing the alpha-Fe2O3 microspheres into water again; adding ceric ammonium nitrate, urea and PVP to dissolve; reacting at a certain temperature to coat a CeO2 shell layer; centrifugally washing the obtained product, namely, Fe2O3 / CeO2; dispersing into water again; adding nickel sulfate, urea and PVP to dissolve; reacting at a certain temperature to coat an Ni(OH2) shell layer; centrifugally washing the obtained product, namely, Fe2O3 / CeO2 / Ni(OH)2 after the reaction is done; drying; and transferring into a muff furnace to roast to obtain Fe2O3 / CeO2 / NiO core-shell structural microspheres. The Fe2O3 / CeO2 / Ni(OH)2 microspheres and the Fe2O3 / CeO2 / NiO microspheres, prepared by the preparation method, are of a novel three-layer core-shell structure; the core layers are of a multi-level structure formed by nanometer assembly; and the microspheres can be applied to the development of novel Ni-Ce-Fe based functional materials.

Description

technical field [0001] The invention belongs to the field of preparation of inorganic pole functional materials, and relates to a method for preparing metal oxide composite microspheres, in particular to a Fe 2 o 3 / CeO 2 / NiO core-shell structure microspheres preparation method. Background technique [0002] α-Fe 2 o 3 It is the most stable oxide among iron oxides, and has the advantages of rich content, no harm to the environment, and low preparation cost. CeO 2 It is the most active oxide among rare earth oxides, and has a relatively unique crystal structure, high oxygen storage capacity and oxygen release capacity, and strong oxidation-reduction capacity. The application of catalysts, catalyst supports and co-catalysts in industrial catalysis research such as three-way catalysis and CO catalytic oxidation has attracted more and more attention. NiO is also a promising functional material, and the research on NiO as an active component of catalyst has aroused great ...

Claims

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Application Information

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IPC IPC(8): B01J23/83
Inventor 宋彩霞王德宝周艳红姜丽红郭小松
Owner 徐州康翔精密制造有限公司
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