Black cerium dioxide nano-material and preparation method thereof

Abstract

The invention particularly relates to a black cerium dioxide nano-material and a preparation method thereof, and belongs to the technical field related to preparation of cerium dioxide nano-materials.The preparation method of the black cerium dioxide nano-material comprises the following steps: mixing a cerium salt solution with an alkali liquor, and stirring to obtain a precipitate, wherein themolar concentration ratio of the cerium salt solution to the alkali liquor is 1:(100-200); adding the precipitate into liquid nitrogen, and carrying out low-temperature treatment to obtain blue crystals; unfreezing and drying the blue crystals to obtain yellow cerium oxide; and carrying out a reduction reaction on the yellow cerium oxide at the temperature of 500-800 DEG C under the hydrogen condition to obtain the black cerium dioxide nano-material which is stable at room temperature. The black cerium dioxide nano-material prepared by the method has excellent photo-thermal conversion efficiency, waste gas catalytic treatment, carbon dioxide catalytic reduction and other application values.

Description

technical field [0001] The invention belongs to the technical field related to the preparation of cerium oxide nanomaterials, and in particular relates to a black cerium oxide nanomaterial and a preparation method thereof. Background technique [0002] Oxygen vacancies on the surface of cerium oxide have a strong function of storing and releasing oxygen. Therefore, as a catalyst with strong oxygen exchange capacity, it is widely used in the treatment of petrochemical and automobile exhaust pollutants. Oxidation reactions can be carried out under mild conditions, such as the C-H bond activation of alkanes, CO oxidation, methane oxidation coupling, etc., but the activity is low at room temperature; the activity is high under high temperature conditions, but it is easy to produce carbon deposition, and the catalyst is sintered at high temperature , and cause a lot of energy consumption and other problems, it is necessary to design and prepare catalytic materials with better cat...

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Problems solved by technology

[0005] However, further studies have shown that the above-mentioned existing solutions still have the following defects or deficiencies: first, such methods are relatively complex and consume a lot of energy; second, they usually require the use of organic ligands, which are expensive and difficult to achieve mass production. Moreover, these organic ligands are not resistant to high temperature and are likely to cause secondary pollution.

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