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Preparation method of silica-supported magnetic cobalt oxide catalyst

A technology of cobalt oxide and silica, which is applied in the field of preparation of silica-loaded magnetic cobalt oxide catalysts, can solve the problems of reduced catalytic activity and lack of active sites, and achieve the effect of prolonging catalytic activity

Active Publication Date: 2015-05-20
枣庄市新星钢结构有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The life of the catalyst is an important indicator for evaluating the properties of the catalyst. However, the activity of the catalyst reported in this paper is only 1 hour. The reason for the decrease in the catalytic activity of CoO nanocrystals may be that the surface structure or crystal structure of CoO nanocrystals has changed, resulting in the formation of active sites. lack of
The agglomeration of catalysts may also be an important reason for the reduction of catalytic activity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] CoCl 2 , FeCl 3 and FeCl 2 were dissolved in water respectively, and configured as a solution with a concentration of 2mol / L, and the three solutions were mixed to keep Co 2+ : Fe 2+ : Fe 3+ The molar ratio is 2:2:1, drop a certain amount of NaOH in a constant temperature 80°C water bath, keep the pH value at 13, react for 3 hours, and age for 24 hours. During the process, a hydrotalcite-like precipitate with a layered structure is formed. Precipitation and separation, washing with deionized water 3 times; adding the precipitated solid to a sodium silicate solution with a concentration of 1 mol / L, adding 10 g of precipitate per liter of sodium silicate solution, stirring for 5 hours, and separating by precipitation to obtain After the solid is washed three times with deionized water, it is calcined at a temperature of 350° C. to obtain a preparation method of a silica-supported magnetic cobalt oxide catalyst.

[0016] Using a U-shaped tube (inner diameter 4mm) cont...

Embodiment 2

[0018] CoCl 2 , FeCl 3 and FeCl 2 were dissolved in water respectively, and configured as a solution with a concentration of 1mol / L, and the three solutions were mixed to keep Co 2+ : Fe 2+ : Fe 3+ The molar ratio is 3:1:1, drop a certain amount of NaOH in a constant temperature 70°C water bath, keep the pH value at 13, react for 2 hours, and age for 12 hours. During this process, a hydrotalcite-like precipitate with a layered structure is formed. Precipitate and separate, wash 2 times with deionized water; add the precipitated solid to the sodium silicate solution with a concentration of 0.5mol / L, the amount of precipitate added to each liter of sodium silicate solution is 5g, stir for 4h, precipitate and separate, After the obtained solid is washed twice with deionized water, it is calcined at a temperature of 300° C. to obtain a preparation method of a silica-supported magnetic cobalt oxide catalyst.

[0019] A U-shaped tube (inner diameter 4mm) continuous flow reactio...

Embodiment 3

[0021] CoCl 2 , FeCl 3 and FeCl 2 were dissolved in water respectively, and configured as a solution with a concentration of 2mol / L, and the three solutions were mixed to keep Co 2+ : Fe 2+ : Fe 3+ The molar ratio is 3:2:1, drop a certain amount of NaOH in a constant temperature 75°C water bath, keep the pH value at 12, react for 3 hours, and age for 24 hours. During the process, a hydrotalcite-like precipitate with a layered structure is formed. Precipitation and separation, washing with deionized water 3 times; adding the precipitated solid to a sodium silicate solution with a concentration of 1 mol / L, adding 10 g of precipitate per liter of sodium silicate solution, stirring for 5 hours, and separating by precipitation to obtain After the solid is washed three times with deionized water, it is calcined at a temperature of 350° C. to obtain a preparation method of a silica-supported magnetic cobalt oxide catalyst.

[0022] Weighing 200mg of the synthesized silica-suppor...

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Abstract

The invention discloses a preparation method of a silica-supported magnetic cobalt oxide catalyst. The preparation method of the silica-supported magnetic cobalt oxide catalyst sequentially comprises the following steps: respectively dissolving CoCl2, FeCl2 and FeCl3 in water to prepare solutions with the concentration of 1-2mol / L, mixing two solutions, dropwise adding a certain amount of NaOH, carrying out reaction and aging to form hydrotalcite-like precipitate of a layered structure, precipitating, separating and washing; adding solids obtained during precipitating into sodium silicate solution, stirring, precipitating, separating, and calcining the obtained solids at the temperature of 300-350 DEG C, so that the silica-supported magnetic cobalt oxide catalyst is obtained. Due to supporting of silica, hydrotalcite-like slice layers are separated from one another and are fixed, so that the silica-supported magnetic cobalt oxide catalyst has a good porous structure and large specific surface area, and adsorption and catalysis can be facilitated; and magnetic particles exist, so that the silica-supported magnetic cobalt oxide catalyst can be quickly separated after degrading pollutants in wastewater.

Description

technical field [0001] The invention relates to the development of new materials for environmental pollution control, in particular to a method for preparing a silica-loaded magnetic cobalt oxide catalyst. Background technique [0002] Cobalt oxide catalysts are widely used, especially in the catalytic oxidation of some refractory pollutants, such as catalytic oxidation of formaldehyde, catalytic oxidation of cyclohexane and other organic substances at room temperature. But there is no suitable carrier, the amount of cobalt oxide is large, and the efficiency is low; there are carbon nanotubes or mesoporous silicon oxide for research, but these materials are relatively expensive. Recently, "Nature-Nanotechnology" reported a high-efficiency single-component CoO nanocrystal visible light catalyst, and its photolysis water hydrogen production efficiency reached 5%, which was nearly 40-50 times higher than the previously reported 0.1%. At the same time, the synthesis process of ...

Claims

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Application Information

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IPC IPC(8): B01J23/75B01J35/10B01J20/10B01J20/28
Inventor 彭明国黄代琴黄文艳
Owner 枣庄市新星钢结构有限公司
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