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Preparation method of flaky nano-cerium oxide

A nano-cerium oxide, flaky technology, which is applied in the field of preparation of flaky nano-cerium oxide by solution precipitation method, can solve the problems of equipment needing pressure resistance and corrosion resistance, inconvenient industrial scale-up production, cumbersome preparation steps, etc., to meet the production equipment and process conditions The effect of low requirements, demanding production conditions, and complex and harsh processes

Inactive Publication Date: 2014-08-20
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the literature about the preparation of flaky nano-cerium oxide (J.Nanopart.Res., 15(2013), 1944-1954.; Dalton Trans., 42(2013), 12087-12092.; CrystEngComm, 14(2012), 1939 -1941.; J.Cryst.Growth, 343(2012), 95-100.; Angew.Chem.Int.Ed., 49(2010), 4484-4487. etc.) and patents (CN200910200963.5, CN201310194946.1 etc.) are also more reported, but most of these methods need to be carried out under hydrothermal or alcohol thermal conditions (100-280 ° C), need to add polymer templates, silane coupling agents or surfactants, etc., not only the preparation steps It is cumbersome and costly (equipment needs to withstand pressure and corrosion, high temperature and high energy consumption), and will bring a lot of waste water to cause environmental pollution, so it is not convenient for industrial scale-up production

Method used

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  • Preparation method of flaky nano-cerium oxide
  • Preparation method of flaky nano-cerium oxide
  • Preparation method of flaky nano-cerium oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Weigh 1.39g of cerium nitrate and 0.75g of ammonium bicarbonate, add them to 200ml of deionized water respectively, stir well until completely dissolved to form a transparent solution, then quickly add the ammonium bicarbonate solution into the cerium nitrate solution at 0°C, and stir to react 0.5 hours, then the precipitation solution was statically aged at 0°C for 24 hours, filtered, washed with deionized water, dried at 110°C for 12h, placed in a muffle furnace and roasted at 450°C for 4h to obtain the attached figure 1 Nanocerium oxide in sheet form is shown.

Embodiment 2

[0023] Weigh 1.39g of cerium nitrate and 0.75g of ammonium bicarbonate, add them to 200ml of deionized water respectively, stir well until completely dissolved to form a transparent solution, then quickly add the ammonium bicarbonate solution into the cerium nitrate solution at 25°C, and stir to react 0.5 hours, and then the precipitation solution was statically aged at 25°C for 15 hours, filtered, washed with deionized water, and dried at 110°C for 12 hours, and roasted at 450°C for 4 hours in a muffle furnace to obtain the attached figure 2 Nanocerium oxide in sheet form is shown.

Embodiment 3

[0025] Weigh 1.39g of cerium nitrate and 0.75g of ammonium bicarbonate, add them into 200ml of deionized water, stir well until completely dissolved to form a transparent solution, then quickly add the ammonium bicarbonate solution into the cerium nitrate solution at 50°C, and stir to react 0.5 hours, and then the precipitation solution was statically aged at 50°C for 15 hours, filtered, washed with deionized water, and dried at 110°C for 12 hours, and roasted at 450°C for 4 hours in a muffle furnace to obtain the attached image 3 Nanocerium oxide in sheet form is shown.

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Abstract

The invention relates to a preparation method of flaky nano-cerium oxide, comprising the following steps: preparing an aqueous solution of water-soluble cerium salt and an aqueous solution of a precipitant carbonate; adding the aqueous solution of carbonate into the aqueous solution of cerium salt within the temperature range of 0-50 DEG C under the condition of stirring; continuously stirring to react for 0.2-2 h so as to obtain a precipitate solution; aging the precipitate solution for 0-48 h under stationary condition and at the temperature of 0-50 DEG C; collecting a precipitate from the precipitate solution; and washing, drying and roasting to obtain flaky nano-cerium oxide. Hydrothermal / alcohol-thermal processes are not required. Flaky nano-cerium oxide is synthesized at one step of solution precipitation reaction at low temperature. Problems of many required raw materials, complex process, harsh production conditions and the like by a hydrothermal / alcohol-thermal method, sol-gel method, micro-emulsion method or traditional liquid phase method are avoided. Technological conditions are mild and easy to control, and the preparation method is environmentally friendly and pollution-free.

Description

technical field [0001] The invention belongs to the technical field of preparation of inorganic nanometer materials, and in particular relates to a method for preparing flaky nano cerium oxide by a solution precipitation method. Background technique [0002] Cerium oxide has strong redox properties (Ce 3+ / C 4+ ), oxygen storage and release capacity, and its strong absorption capacity for ultraviolet rays, are widely used in modern high-tech fields such as gas sensors, optical materials, ultraviolet absorbers, high-temperature oxygen-sensitive materials, solid oxide fuel cells, and three-way catalysts. Especially as a catalytic material, it has outstanding advantages in the fields of three-way catalysis and catalytic oxidation (catalytic combustion of volatile organic pollutants), and the catalytic performance of cerium oxide is directly related to its morphology. Many studies have found that cerium oxide nanorods, nanowires or nanocubes with preferentially exposed (100), ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00B82Y40/00
Inventor 戴启广白树行王建伟王幸宜
Owner EAST CHINA UNIV OF SCI & TECH
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