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Preparation method for cerium oxide with structure of multilevel pore canals

A technology of pore structure and cerium oxide, which is applied in the fields of chemical instruments and methods, inorganic chemistry, rare earth metal compounds, etc., can solve problems such as complex methods, difficult to control pore structure, and unsuitable for mass production, and achieve simple preparation methods , The effect of stable product quality

Inactive Publication Date: 2015-04-08
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The soft template method is difficult to control the structure of the pores, and the method of synthesizing mesoporous cerium oxide materials through mesoporous silicon materials as hard templates is too complicated and not suitable for mass production

Method used

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  • Preparation method for cerium oxide with structure of multilevel pore canals
  • Preparation method for cerium oxide with structure of multilevel pore canals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Artemia egg shells were cleaned with distilled water, and after ball milling for 6 hours, they were washed with HCl with a concentration of 6mol / L and HCl with a concentration of 8mol / L. 2 SO 4 , 6mol / L HNO 3 , 2mol / L KOH soaking pretreatment, the soaking time is 2h for each substance, and dry to remove water; dissolve 0.126g Pluronic F127 in 5mL water and 5mL ethanol, add 0.5g cerium nitrate, 0.484g citric acid, and stir for 0.5h ; Add 0.5 g of the above-treated Artemia egg shells and let stand for 2 hours, filter with suction, and dry in vacuum at 80° C. for 6 hours. Then control the calcination temperature of 300° C. for 3 hours at a heating rate of 1° C. / min to keep the dried product at a temperature of 400° C. and keep it for 4 hours to obtain multi-level porous ceria. Such as figure 1 As shown, the analysis shows that the product is pure phase ceria.

Embodiment 2

[0021] Artemia egg shells were cleaned with distilled water, and after ball milling for 6 hours, they were washed with HCl with a concentration of 9mol / L and HCl with a concentration of 13mol / L. 2 SO 4 , 10mol / L of HNO 3 , 4mol / L KOH soaking pretreatment, soaking time is 4h for each substance, drying to remove moisture; dissolving 0.074g CTAB in 8mL water and 6mL ethanol, adding 3.75g cerium acetate, 2.90g citric acid, and stirring for 1.25h; After adding 1.5 g of the above-treated Artemia egg shells, let stand for 4 hours, filter with suction, and dry in vacuum at 90° C. for 15 hours. Then, the obtained dried product is controlled at a heating rate of 5.5° C. / min, and the calcination temperature is controlled at 300° C. for 3 hours, and the calcination temperature is 600° C., and kept for 5 hours to obtain multi-level porous cerium oxide.

Embodiment 3

[0023] Clean Artemia egg shells with distilled water, and after ball milling for 6 hours, use HCl with a concentration of 12mol / L and HCl with a concentration of 18mol / L respectively. 2 SO 4 , 14mol / L HNO 3 , 6mol / L KOH soaking pretreatment, the soaking time is 6h for each substance, and dry to remove water; dissolve 0.1093g CTAB in 6mL water and 4mL ethanol, add cerium acetate 7g, citric acid 3.61g, stir for 2h; add 2.5 g. After the above-mentioned treated Artemia egg shells were left to stand for 6 hours, they were suction filtered and dried in vacuum at 100° C. for 24 hours. Then, the obtained dried product is controlled at a heating rate of 10° C. / min, and the calcining temperature is controlled at 300° C., kept for 3 hours, and the calcined temperature is 800° C., kept for 6 hours to obtain multi-level porous cerium oxide.

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Abstract

A preparation method for cerium oxide with a structure of multilevel pore canals comprises: taking a surfactant or a segmented copolymer as a soft template, an eggshell of artemia cysts as a hard template, adding metal salts and citric acid, vacuum filtrating, vacuum drying, heating to 300 DEG C at a speed of 1-10 DEG C / min in a muffle furnace and roasting for 3 h, and roasting at 400-800 DEG C for 4-6 h to obtain a transition metal oxide cerium oxide with the structure of the multilevel pore canals. The preparation method is simple, convenient to control, good in repeatability, steady in product quality, and extremely uniform in distribution of the multilevel pore canals of the synthesized cerium oxide, and is widely applicable in the field of solid fuel cells, catalysis, adsorption, sensors and the like.

Description

technical field [0001] The invention belongs to the technical field of functional materials, in particular to a method for preparing metal oxides. Background technique [0002] Ceria is a cheap and versatile rare earth material, which is widely used in glass, high temperature ceramics, phosphor, fuel cells and other fields. It has abundant lattice oxygen vacancies, excellent oxygen storage and release properties, and low Ce 3+ and Ce 4+ It can be used as an oxygen storage material in a three-way catalyst for automobile exhaust; it can also be used as a catalyst for methane reforming, methane partial oxidation hydrogen production and water gas conversion hydrogen production reaction, but the specific surface area of ​​ceria is small, The strength is also poor, and its application is subject to certain restrictions. Due to its large surface area and relatively regular pore structure, porous ceria is expected to play an important role in solid fuel cells, catalysis, adsorpti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F17/00
Inventor 赵玉峰何静冉伟高发明
Owner YANSHAN UNIV
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