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The preparation method of manganese-doped ceo2 nanopowder

A nano-powder, manganese-doped technology, applied in nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve problems such as nanoparticle agglomeration, and achieve the effect of low reaction temperature and simple operation.

Inactive Publication Date: 2011-12-14
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the precipitation method is simple, it needs to be roasted at high temperature, which is easy to agglomerate nanoparticles, which is very unfavorable for nanoparticles that require high specific surface area

Method used

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  • The preparation method of manganese-doped ceo2 nanopowder
  • The preparation method of manganese-doped ceo2 nanopowder
  • The preparation method of manganese-doped ceo2 nanopowder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Use a 25 kg vacuum induction furnace to melt 64.4% metal cerium, 27.6% electrolytic manganese and 8% graphite (mass percentage), choose a graphite crucible, fully melt and cast to obtain a cerium-manganese carbide alloy. Break the cerium-manganese carbide alloy into powder with a particle size of less than 0.15mm, put 100ml of deionized water in a 200ml beaker, place it on a magnetic stirrer, adjust the temperature to stabilize it at 30°C, and take the cerium-manganese carbide alloy powder 5 g, it was slowly poured into deionized water, stirred and reacted for 18 hours to obtain a brown suspension. Pour off the upper layer, then add deionized water to stir and wash, repeat this several times, and dry in an oven at 80°C in the air to obtain brown composite cerium-manganese nanopowder. The specific surface area of ​​the nanopowder is 142m 2 / g. Composite cerium-manganese nanopowder is heat-treated at 600℃ / 2h, and the main phase is CeO 2 nanopowder.

Embodiment 2

[0023] Use a 25 kg vacuum induction furnace to melt 78.2% of metal cerium, 13.8% of electrolytic manganese and 8% of graphite (mass percentage), choose graphite crucible, fully melt and cast to obtain cerium-manganese carbide alloy. Break the cerium-manganese carbide alloy into a powder with a particle size of less than 0.15mm, put 150ml of deionized water in a 200ml beaker, place it on a magnetic stirrer, adjust the temperature to stabilize it at 20°C, and take the cerium-manganese carbide alloy powder 5 g, it was slowly poured into deionized water, and stirred for 24 hours to obtain a brown suspension. Pour off the upper layer, then add deionized water to stir and wash, repeat this several times, and dry in an oven at 50°C in the air to obtain brown composite cerium-manganese nanopowder. The specific surface area of ​​the nanopowder is 121m 2 / g. The composite cerium-manganese nanopowder is heat-treated at 800°C / 2h to obtain the main phase as CeO 2 nanopowder.

Embodiment 3

[0025] Use a 25 kg vacuum induction furnace to melt 45.5% metal cerium, 45.5% electrolytic manganese and 9% graphite, choose graphite crucible, fully melt and cast to obtain cerium manganese carbide alloy. Break the cerium-manganese carbide alloy into a powder with a particle size of less than 0.3mm, take 100ml of deionized water in a 200ml beaker, place it on a magnetic stirrer for stirring, adjust the temperature to stabilize it at 40°C, and take the cerium-manganese carbide alloy 5 g of powder was slowly poured into deionized water, and stirred for 30 hours to obtain a brown suspension. Pour off the upper layer, then add deionized water to stir and wash, repeat this several times, and dry in an oven at 60°C in the air to obtain brown composite cerium-manganese nanopowder. The specific surface area of ​​the nanopowder is 118m 2 / g. The composite cerium-manganese nanopowder is heat-treated at 600°C / 2h to obtain the main phase as CeO 2 nanopowder.

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Abstract

The invention relates to a method for preparing CeO2 nanopowder from cerium manganese carbide. A 25 kg vacuum induction furnace is used to melt 45.5-91% metal cerium, 3-45.5% electrolytic manganese and 6-9% graphite (mass percentage), and select graphite crucible , after melting and casting to obtain cerium-manganese carbide alloy, prepare cerium-manganese carbide alloy powder with a particle size of less than 0.15mm and deionized water at a mass ratio of 1:10 to 1:40, and stir at a constant temperature of 10 to 50°C for 18 to 36 hours reacting, washing and drying to obtain composite cerium-manganese nanopowder with a specific surface area of ​​118-142m2 / g. The composite cerium-manganese nanopowder is heat-treated at 600-800°C / 2h to obtain the nanopowder whose main phase is CeO2, and the manganese-doped CeO2nanopowder has good thermal stability. The method is simple to operate, environmentally friendly and easy to realize industrial production.

Description

technical field [0001] The invention relates to a manganese-doped CeO 2 The invention relates to a preparation method of nanometer powder, which belongs to the technical field of inorganic materials. Background technique [0002] Rare earth metals have strong oxygen storage function and good thermal stability. The mixture of rare earth oxides and transition metal oxides can greatly improve the activity and life of the catalyst. CeO 2 by CE 4+ and Ce 3+ The high-efficiency redox cycle between them has the ability to store and release oxygen, and has been used in combustion catalyst additives, automobile exhaust purification, fluid catalytic cracking desulfurization, wastewater treatment, and low-temperature catalytic oxidation of carbon monoxide. But pure CeO 2 The thermal stability of the structure is poor, the oxidation activity is poor, and it is easy to sinter, which reduces its oxygen storage performance and limits the CeO 2 Applications. Its catalytic activity c...

Claims

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Application Information

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IPC IPC(8): C01F17/00B82Y30/00B82Y40/00
Inventor 倪建森杜亚男吴移清李其亭
Owner SHANGHAI UNIV
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