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A kind of cobalt-doped cerium oxide nanomaterial with sheet structure and its preparation and application

A sheet-like structure, nanomaterial technology, applied in nanotechnology, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of difficult popularization and application, insufficient cleanliness and energy saving, complex raw materials, etc., and achieves good mercury removal effect and surface oxygen content. And the effect of improving oxygen storage capacity, increasing reaction sites and activity

Active Publication Date: 2018-02-23
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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  • A kind of cobalt-doped cerium oxide nanomaterial with sheet structure and its preparation and application
  • A kind of cobalt-doped cerium oxide nanomaterial with sheet structure and its preparation and application
  • A kind of cobalt-doped cerium oxide nanomaterial with sheet structure and its preparation and application

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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 nanomaterial with a sheet structure, its preparation and its application in mercury removal. It includes the following steps: using a certain proportion of cerium nitrate and cobalt salt as raw materials, using urea as an alkali source, and polyvinylpyrrolidone as a surfactant, mixing and hydrolysis reaction, and the obtained mixture is stored at a constant temperature with hydrothermal energy, washed and dried, and then After calcination, cobalt-doped cerium oxide with regular morphology, uniform size and complete sheet-like nanostructure is obtained. The cobalt-doped cerium oxide material prepared by the invention has a novel structure, simple and easy-to-obtain raw materials, simple procedures, clean reaction process, and no secondary pollution. It is used to remove mercury in gas. The method is simple and the mercury removal effect is good. When processing Hg0 vapor with a concentration of 75 μg / m3, the mercury removal rate can reach more than 97% under the conditions of anaerobic or 4% oxygen.

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 Patents(China)
IPC IPC(8): C01F17/00B82Y40/00B01J23/83B01J35/10B01D53/86B01D53/64
CPCB01D53/8665B01J23/83C01P2006/12C01P2002/80C01P2004/03C01P2004/04C01P2002/72C01F17/32B01J35/40B01J35/61
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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