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Superficially porous magnesium oxide-sludge carbon hollow sphere ozone catalyst and preparation method and application thereof

A technology with porous surface and magnesium oxide, which is applied in the fields of physical/chemical process catalysts, chemical instruments and methods, oxidized water/sewage treatment, etc., can solve the problems of difficult separation of powder ozone catalysts and low utilization rate of catalysts, and achieve great promotion Application value, excellent activity, easy separation effect

Inactive Publication Date: 2018-08-03
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem that the powder ozone catalyst is difficult to separate, and the molded granular catalyst has mass transfer barriers, which leads to the low utilization rate of the catalyst, and provides a method for preparing a porous magnesium oxide-sludge carbon hollow sphere ozone catalyst.
[0005] The surface porous magnesium oxide-sludge carbon hollow sphere ozone catalyst provided by the invention is a hollow sphere particle, which is easy to separate, and because the catalyst is hollow and the surface of the spherical shell is porous, it overcomes the catalyst utilization rate caused by mass transfer obstacles in ordinary shaped particle catalysts not high problem

Method used

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  • Superficially porous magnesium oxide-sludge carbon hollow sphere ozone catalyst and preparation method and application thereof
  • Superficially porous magnesium oxide-sludge carbon hollow sphere ozone catalyst and preparation method and application thereof
  • Superficially porous magnesium oxide-sludge carbon hollow sphere ozone catalyst and preparation method and application thereof

Examples

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Effect test

Embodiment 1

[0033] A preparation method of a magnesia-sludge carbon hollow sphere ozone catalyst with porous surface, the preparation method of the ozone catalyst is as follows:

[0034] (1) Mix 25.84g dry sludge, 14.5g pore-forming agent citric acid and 6.45g magnesium nitrate, add an appropriate amount of water, and evaporate the mixture to viscous mud under the condition of constant temperature magnetic stirring at 70°C.

[0035] (2) Coat polystyrene foam plastic particles with a diameter of 1 mm with the viscous material, the coating thickness is 10 mm, and the diameter of the circular pellets after coating is 21 mm. The coated round pellets were placed in an oven at 20°C, and dried to a constant weight at a certain drying temperature.

[0036] (3) Then put it into a nitrogen atmosphere furnace, under nitrogen protection, at a heating rate of 5°C / min to a carbonization temperature of 250°C, and keep the carbonization time at this temperature for 24h. After the tube furnace is natural...

Embodiment 2

[0038] A preparation method of a magnesia-sludge carbon hollow sphere ozone catalyst with porous surface, the preparation method of the ozone catalyst is as follows:

[0039] (1) Mix 25.84g of dry sludge, 14.5g of pore-forming agent citric acid and 12.74g of magnesium nitrate, add an appropriate amount of water, and evaporate the mixture to viscous mud under the condition of constant temperature magnetic stirring at 70°C.

[0040] (2) Coat polystyrene foam plastic particles with a diameter of 16 mm with the viscous material, the coating thickness is 0.5 mm, and the diameter of the coated round balls is 17 mm. The coated round pellets were placed in a 200°C oven, and dried to a constant weight at a certain drying temperature.

[0041] (3) Then put it into a nitrogen atmosphere furnace, under nitrogen protection, at a heating rate of 20 ℃ min to 1300 ℃ carbonization temperature, and keep the carbonization time at this temperature for 0.1h. After the tube furnace is naturally co...

Embodiment 3

[0043] A preparation method of a magnesia-sludge carbon hollow sphere ozone catalyst with porous surface, the preparation method of the ozone catalyst is as follows:

[0044] (1) Mix 25.84g of dry sludge, 14.5g of pore-forming agent citric acid and 19.09g of magnesium nitrate, add an appropriate amount of water, and evaporate the mixture to a viscous mud-like substance under the condition of constant temperature magnetic stirring at 70°C.

[0045] (2) Coat polystyrene foam plastic particles with a diameter of 5 mm with the viscous material, the coating thickness is 5 mm, and the diameter of the circular pellets after coating is 15 mm. The coated round pellets were placed in an oven at 80°C, and dried to constant weight at a certain drying temperature.

[0046] (3) Then put it into a nitrogen atmosphere furnace, under nitrogen protection, at a heating rate of 30 ℃ / min to 700 ℃ carbonization temperature, and keep the carbonization time at this temperature for 3h. After the tube...

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Abstract

The invention relates to a superficially porous magnesium oxide-sludge carbon hollow sphere ozone catalyst and a preparation method and application thereof. The preparation method for the ozone catalyst comprises the following steps of S1: mixing sludge, a pore-forming agent and magnesium nitrate, adding water for stirring, and then, steaming a mixture to obtain sticky muddy substances; S2: usingthe sticky muddy substances obtained in the S1 to coat plastic particles with specific diameters, controlling the diameter of the coated globule to obtain specific coating thickness, and drying to constant weight; S3: putting the globule coated in S2 in inert atmosphere, raising temperature to sludge carbonization temperature, keeping for a period of time, and cooling to obtain the superficially porous magnesium oxide-sludge carbon hollow sphere ozone catalyst. The superficially porous magnesium oxide-sludge carbon hollow sphere ozone catalyst provided by the invention is easy in separation, and in addition, since the catalyst is hollow and the surface of the spherical shell is porous, the problem of low catalyst use ratio by mass transfer obstacles in a common forming particle catalyst isovercome.

Description

technical field [0001] The invention relates to the fields of ozone catalytic oxidation and environmental materials, in particular to a surface-porous magnesium oxide-sludge carbon hollow sphere ozone catalyst and a preparation method and application thereof. Background technique [0002] Ozone catalytic oxidation technology only needs to add a highly active catalyst during the ozone oxidation process to catalyze the decomposition of ozone to generate extremely strong oxidizing hydroxyl radicals (oxidation potential, 2.80v), which can catalyze the high stability of those that are difficult to be oxidized by ozone alone. It can effectively degrade the organic pollutants that are resistant to degradation and refractory, so as to achieve the purpose of deep oxidation and maximum removal of organic pollutants. [0003] Magnesium oxide is a non-toxic, environmentally friendly and cheap material, and its powder material shows excellent ozone catalytic oxidation activity, but the m...

Claims

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Application Information

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IPC IPC(8): B01J21/18B01J35/08C02F1/78
CPCC02F1/725C02F1/78B01J21/18B01J35/397B01J35/51
Inventor 田双红陆江熊亚
Owner SUN YAT SEN UNIV
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