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Preparation method of catalyst for ozone oxidization

A technology of ozone oxidation and catalyst, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve problems such as shedding and loss, and achieve uniform distribution and high specific surface area Large, good catalytic effect

Inactive Publication Date: 2015-05-20
POTEN ENVIRONMENT GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is: on the one hand, since most of the active components will be deposited on the outer surface of the catalyst carrier during the impregnation process, it is easy to fall off and lose due to the friction between the catalyst carriers during sewage treatment.

Method used

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  • Preparation method of catalyst for ozone oxidization
  • Preparation method of catalyst for ozone oxidization
  • Preparation method of catalyst for ozone oxidization

Examples

Experimental program
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Effect test

Embodiment 1

[0035]The specific surface area is 800~1200m 2 / g, the rod-shaped activated carbon with a particle size of 1.5-3 mm is used as a catalyst carrier, activated with 45% nitric acid at 60 ° C for 2 hours under reflux, then washed to neutral, and dried for later use.

[0036] Prepare a 10% mixed aqueous solution of ferric sulfate and manganese nitrate, wherein the molar ratio of iron to manganese is 5:1; the volume of the mixed aqueous solution of ferric sulfate and manganese nitrate is 1.5 times the volume of activated carbon. 10% ammonia water was used as precipitant.

[0037] The activated activated carbon is placed in a container, and under stirring, the pre-prepared iron salt, manganese salt mixed aqueous solution and ammonia water are added to the container for co-precipitation, wherein the iron salt, manganese salt mixed aqueous solution Adding speed is 3 ml / min, adjust the adding speed of ammonia water to ensure the pH value of the liquid in the container is 8-10, until th...

Embodiment 2

[0039] The specific surface area is 800~1200m 2 / g, the rod-shaped activated carbon with a particle size of 1.5-3 mm is used as a catalyst carrier, activated with 10% nitric acid under the condition of reflux for 4 hours at 80 ° C, then washed to neutral, and dried for later use.

[0040] Prepare a 15% mixed aqueous solution of ferric sulfate and manganese chloride, wherein the molar ratio of iron to manganese is 3:1; the volume of the mixed aqueous solution of ferric sulfate and manganese chloride is 1.5 times the volume of activated carbon. 15% ammonia water was used as precipitant.

[0041] The activated activated carbon is placed in a container, and under stirring, the pre-prepared iron salt, manganese salt mixed aqueous solution and ammonia water are added to the container for co-precipitation, wherein the iron salt, manganese salt mixed aqueous solution Adding speed is 6 ml / min, adjust the adding speed of ammonia water to ensure the pH value of the liquid in the contain...

Embodiment 3

[0043] The specific surface area is 800~1200m 2 / g, the rod-shaped activated carbon with a particle size of 1.5-3 mm is used as a catalyst carrier, activated by refluxing with 25% nitric acid for 3 hours at 70 ° C, then washed to neutral, and dried for later use.

[0044] Prepare a 20% mixed aqueous solution of ferric nitrate and manganese chloride, wherein the molar ratio of iron to manganese is 2:1; the volume of the mixed aqueous solution of ferric nitrate and manganese chloride is 1.5 times the volume of activated carbon. 20% ammonia water was used as precipitant.

[0045] The activated activated carbon is placed in a container, and under stirring, the pre-prepared iron salt, manganese salt mixed aqueous solution and ammonia water are added to the container for co-precipitation, wherein the iron salt, manganese salt mixed aqueous solution Adding speed is 10 ml / min, adjust the adding speed of ammonia water to ensure that the pH value of the liquid in the container is 10-12...

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Abstract

The embodiment of the invention discloses a preparation method of a catalyst for ozone oxidization. The method comprises the steps of feeding a preliminarily prepared mixed aqueous solution and a preliminarily prepared hydroxide solution of iron salt and manganese salt into a vessel filled with an activated catalyst carrier, carrying out co-precipitation, enabling the concentration of generated precipitates to be gradually increased, so that the generated precipitates can be uniformly distributed in inner pores and on the outer surface of the catalyst carrier, and then roasting the catalyst carrier to obtain the catalyst. Active components of the prepared catalyst are large in specific surface area, and the catalytic effect is good. Moreover, the active components in the inner pores can be prevented from dropping and loss due to the friction of the catalyst carriers; on the other hand, the precipitate consists of iron or manganese hydroxide, so that no pollutant is generated in the roasting process.

Description

technical field [0001] The invention relates to the field of catalyst preparation, in particular to a method for preparing a catalyst for ozone oxidation. Background technique [0002] In recent years, new coal chemical technologies have been gradually applied. Coal chemical companies will also generate a lot of sewage while using these new coal chemical technologies to create benefits. Because these sewages contain a large amount of refractory organic matter, such as phenols, polycyclic aromatic hydrocarbons, heterocyclic compounds, etc., the chemical oxygen demand (Chemical Oxygen Demand, COD) and chromaticity are relatively high. [0003] Now, ozone oxidation technology is generally used to treat these refractory sewage in depth. Ozone oxidation technology uses ozone to decompose active intermediates such as free radicals under the action of a catalyst, and uses the generated active intermediates to degrade organic matter in sewage, thereby reducing the chemical oxygen d...

Claims

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Application Information

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IPC IPC(8): B01J23/889C02F1/78
Inventor 俞彬任娜乔瑞平陈广升
Owner POTEN ENVIRONMENT GRP
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