Cobalt-doped cerium oxide nanometer material with flaky structure and preparation and application thereof

A sheet-like structure and nanomaterial technology, applied in nanotechnology, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as difficult promotion and application, insufficient cleanliness and energy saving, and complex raw materials. Good mercury removal effect, improved oxygen content and oxygen storage capacity, and simple preparation process

Active Publication Date: 2017-05-31
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, most of the synthesis methods of cerium oxide nanomaterials are complicated in raw materials, complicated steps, long cycle, not clean enough and energy-saving, difficult to popularize and apply, and there are certain limitations in the application of materials in catalysis

Method used

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  • Cobalt-doped cerium oxide nanometer material with flaky structure and preparation and application thereof
  • Cobalt-doped cerium oxide nanometer material with flaky structure and preparation and application thereof
  • Cobalt-doped cerium oxide nanometer material with flaky structure and preparation and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Add 0.143g of cerium nitrate, 0.095g of cobalt chloride and 0.5g of polyvinylpyrrolidone into 30mL of deionized water, stir magnetically for 10min until it is completely dissolved, then add 2.196g of urea into the reaction solution, stir for 30min, and add the mixture to In a hydrothermal reactor. Put the reaction kettle into an oven and keep the temperature at 150°C for 10h. Then the resulting mixed solution was washed three times with deionized water and twice with ethanol, dried in an oven at 60°C for 10 hours, and finally calcined in a muffle furnace at 500°C for 4 hours to obtain a cobalt-doped cerium oxide flake nanomaterial.

Embodiment 2

[0029] Add 0.143g of cerium nitrate, 0.062g of cobalt acetate and 0.5g of polyvinylpyrrolidone into 30mL of deionized water, stir magnetically for 10min until it is completely dissolved, then add 2.196g of urea into the reaction solution, stir for 30min, and add the mixture to the water in a hot reactor. Put the reaction kettle into an oven and keep the temperature at 150°C for 10h. Then the resulting mixed solution was washed three times with deionized water and twice with ethanol, dried in an oven at 60°C for 10 hours, and finally calcined in a muffle furnace at 500°C for 4 hours to obtain a cobalt-doped cerium oxide flake nanomaterial.

Embodiment 3

[0031] Add 0.143g of cerium nitrate, 0.073g of cobalt nitrate and 0.5g of polyvinylpyrrolidone into 30mL of deionized water, stir magnetically for 10min until it is completely dissolved, then add 2.196g of urea into the reaction solution, stir for 30min, and add the mixture to the water in a hot reactor. Put the reaction kettle into an oven and keep the temperature at 150°C for 10h. Then the resulting mixed solution was washed three times with deionized water and twice with ethanol, dried in an oven at 60°C for 10 hours, and finally calcined in a muffle furnace at 500°C for 4 hours to obtain a cobalt-doped cerium oxide flake nanomaterial.

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Abstract

The invention discloses a cobalt-doped cerium oxide nanometer material with a flaky structure and preparation and application thereof in demercuration. A preparation method comprises the following steps of by using cerium nitrate and cobalt salt as raw materials according to a certain ratio, using urea as an alkaline source, and using polyvinylpyrrolidone as a surfactant, and mixing for hydrolysis reaction, so as to obtain a mixture; storing the mixture in a hydrothermal constant-temperature way, washing, drying, and calcining, so as to obtain the cobalt-doped cerium oxide nanometer material with regular shape, uniform size and the complete flaky structure. The prepared cobalt-doped cerium oxide nanometer material has the advantages that the structure is novel; the raw material is easy, and is easy to obtain; the procedure is simple, the reaction process is clean, and the secondary pollution is avoided; the cobalt-doped cerium oxide nanometer material is used for removing mercury in gas, the method is simple, the demercuration effect is good, and after Hg0 steam with concentration of 75mu g/m<3> is treated, under the condition of no oxygen or leading 4% of oxygen, the demercuration rate can reach 97% or above.

Description

technical field [0001] The invention relates to the field of nanomaterial preparation technology, in particular to a sheet-like cobalt-doped cerium oxide nanomaterial, a preparation method thereof, and an application in mercury removal. Background technique [0002] Cerium oxide is an extremely versatile rare earth oxide with rapidly switchable Ce 3+ / C 4+ , superior oxygen storage and release function, high temperature and rapid oxygen vacancy diffusion ability, are widely used in the field of catalysis. When the size of the material is controlled at the nanometer size, it exhibits unique physical and chemical properties, which is conducive to improving its catalytic activity. Moreover, the catalytic properties of cerium oxide nanomaterials with different morphologies and structures are also very different. In recent years, research has obtained cerium oxide materials with various shapes such as rods, flowers, spheres, fibers, and flakes. Among them, flaky nano-cerium ox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00B82Y40/00B01J23/83B01J35/10B01D53/86B01D53/64
CPCB01D53/8665B01J23/83B01J35/023B01J35/1004C01F17/32C01P2002/72C01P2002/80C01P2004/03C01P2004/04C01P2006/12
Inventor 杨卫春柴立元李超芳刘恢王海鹰唐崇俭杨志辉廖骐
Owner CENT SOUTH UNIV
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