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Preparation technique of stable non-stoichiometry nanometer cerium dioxide particles

A nano-cerium dioxide, non-stoichiometric technology, applied in nanotechnology, inorganic chemistry, nanotechnology, etc. for materials and surface science, can solve the problem of low, non-existent, and poor stability of nano-cerium dioxide average oxygen vacancies and other problems, to achieve the effect of high oxygen vacancy content, high oxygen vacancy content, and simple preparation process

Inactive Publication Date: 2018-01-12
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This shows that ceria is difficult to be reduced at lower temperature, and the stability of non-stoichiometric ceria is very poor unless it is treated by high temperature and reducing atmosphere.
These limit the application of non-stoichiometric ceria and reduce the promotion effect of oxygen vacancies on the performance of ceria
[0006] At present, the techniques for preparing ceria mainly include hydrothermal hydrolysis method, co-precipitation method and combustion flame method, etc., but the nano-ceria prepared by these methods has low average oxygen vacancy content and poor stability.
Therefore, to prepare non-stoichiometric ceria with better stability and higher oxygen vacancy content, there is no corresponding technology

Method used

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  • Preparation technique of stable non-stoichiometry nanometer cerium dioxide particles
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  • Preparation technique of stable non-stoichiometry nanometer cerium dioxide particles

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Experimental program
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Effect test

Embodiment 1

[0033] Embodiment 1: A kind of technique of preparing stable non-stoichiometric nano ceria particles, the steps are as follows:

[0034] 1) Grind cerium carbonate to a particle size of less than 20 μm, and then put it in a drying oven at 100°C for 12 hours to dry and dehydrate to obtain product A;

[0035] 2) Use a thermal plasma generator to excite argon gas (the flow rate of argon gas is 39L / min) into a thermal plasma flame, and use argon gas (the flow rate of argon gas is 3L / min) to carry product A to the thermal plasma In the reactor, the power of the thermal plasma generator is controlled to be 20kW, so that product A is completely reacted in the thermal plasma flame to obtain product B;

[0036] 3) The product B is transported to the collector with the airflow for collection, and the particle size is less than 100 nm, the oxygen vacancy concentration is 22%, and the blue powdery non-stoichiometric nano-cerium oxide particles are obtained.

Embodiment 2

[0037] Embodiment 2: A kind of technique of preparing stable non-stoichiometric nano ceria particles, the steps are as follows:

[0038] 1) Grind cerium carbonate, cerium nitrate or cerium chloride to a particle size of less than 20 μm, and then put it in a drying oven at 80°C for 15 hours to dry and dehydrate to obtain product A;

[0039] 2) Use a thermal plasma generator to excite argon gas (the gas flow rate of argon is 30L / min) into a thermal plasma flame, using argon, hydrogen or argon and hydrogen mixed gas (gas flow rate of 1L / min) Carry product A into a thermal plasma reactor, control the power of the thermal plasma generator to 10kW, let product A react completely in the thermal plasma flame, and obtain product B;

[0040] 3) The product B is transported to the collector with the airflow for collection, and the particle size is less than 100 nm, the oxygen vacancy concentration is 15%, and the blue powdery non-stoichiometric nano-cerium oxide particles are obtained. ...

Embodiment 3

[0041]Embodiment 3: A kind of technique of preparing stable non-stoichiometric nano ceria particles, the steps are as follows:

[0042] 1) Grind cerium carbonate, cerium nitrate or cerium chloride to a particle size of less than 20 μm, and then put it in a drying oven at 120°C for 10 hours to dry and dehydrate to obtain product A;

[0043] 2) Use a thermal plasma generator to excite argon gas (the gas flow rate of argon is 60L / min) into a thermal plasma flame, using argon, hydrogen or argon and hydrogen mixed gas (gas flow rate of 6L / min) Carry product A into a thermal plasma reactor, control the power of the thermal plasma generator to 30kW, let product A react completely in the thermal plasma flame, and obtain product B;

[0044] 3) The product B is transported to the collector with the airflow for collection, and the particle size is less than 100 nm, the oxygen vacancy concentration is 30%, and the blue powdery non-stoichiometric nano-cerium oxide particles are obtained. ...

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Abstract

The invention discloses a preparation technique of stable non-stoichiometry nanometer cerium dioxide particles, which includes steps of 1), grinding inorganic salt of trivalent cerium until the graindiameter is less than 20 mum, and removing crystal water to obtain A product; 2), applying a hot plasma generator to stimulate the activating gas to be hot plasma flame, and carrying the A product toa hot plasma reactor by carrier gas; controlling the power of the hot plasma reactor to 10-30kW, and completely reacting the A product in the hot plasma flame to obtain B product; 3), conveying the Bproduct to a collector along with an air flow to collect and obtain the non-stoichiometry nanometer cerium dioxide particles. The non-stoichiometry nanometer cerium dioxide particles prepared by the invention are featured by good stability and high oxygen vacancy content.

Description

technical field [0001] The invention relates to a preparation method of nano ceria particles, in particular to a process for preparing stable non-stoichiometric nano ceria particles. Background technique [0002] Cerium is the first element in the periodic table to be found to have ground state electrons ([Xe]4f15d16s2) in the 4f orbital, which makes cerium oxide have excellent redox properties, so cerium oxide is widely used as in functional materials. In addition, cerium has a large unit content (66.5 ppm) in the earth's crust, which makes ceria have a high storage capacity and provides a raw material guarantee for its wide application. [0003] Due to the special electron layer structure of cerium element, CeO 2 Oxygen vacancies are easily formed in the lattice to form non-stoichiometric ceria (CeO 2-x ,in x is a non-stoichiometric number, 0< x <0.5), oxygen vacancies are also one of the most important lattice defects of ceria; in addition, due to the strong ox...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00B82Y30/00
Inventor 兰苑培李军旗陈超轶金会心徐本军王林珠刘利
Owner GUIZHOU UNIV
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