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Catalyst used for catalyzing ozone oxidation and preparation method thereof

A technology of ozone oxidation and catalyst, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, molecular sieve catalysts, etc., to achieve the effects of reducing dissolution, avoiding secondary pollution, and reducing loss

Inactive Publication Date: 2016-12-28
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this will increase the construction investment and operating cost of activated carbon filter pool, for this reason the present invention provides a kind of catalytic ozonation catalyst and process method thereof that reduces catalyst loss

Method used

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  • Catalyst used for catalyzing ozone oxidation and preparation method thereof
  • Catalyst used for catalyzing ozone oxidation and preparation method thereof
  • Catalyst used for catalyzing ozone oxidation and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Select spherical Al 2 o 3 (The particle size range is 2.5-4.0mm, and the BET specific surface area is 172.9m 2 / g) Prepare the catalyst as a carrier, immerse it in the copper nitrate solution of 0.4mol / L, take it out after immersion for 8h, dry it at room temperature for 4h, place it in a 105°C oven for 4h, and then place it in the air-atmosphere In a Furnace, bake at 200°C for 4.5h, take it out and cool it to room temperature for 8h. The catalyst was prepared by mixing the prepared carrier catalyst with 15% coconut shell-based activated carbon particles.

[0026] The Cu / Al of the unmixed activated carbon particles prepared in this example 2 o 3 It is applied to the treatment of RO concentrated water (COD is 109.7mg / L) in a refinery with a mixed catalyst. The ozone dosage is 50mg / L, the ozone concentration is 50mg / L, and the hydraulic retention time is 40min. The treatment effect is shown in figure 2 (The solid line is the COD removal rate, and the dotted line is ...

Embodiment 2

[0028] Select 4A type molecular sieve (BET specific surface area is 453.8m 2 / g) mixed with 10% anthracite-based columnar activated carbon, impregnated in a mixed solution of 0.5mol / L cerium nitrate and 0.5mol / L manganese nitrate, after immersion for 10h, take it out and dry it at room temperature for 6h, and then place it at 100°C Dry it in an oven for 2 hours, place it in a nitrogen atmosphere and bake it in a muffle furnace at a temperature of 300°C for 4 hours, take it out and cool it to room temperature for 12 hours to prepare a mixed catalyst.

[0029] The mixed catalyst prepared in this example is applied to the treatment of the secondary biochemical effluent (COD is 96.3mg / L) of a refinery that does not meet the standard of salty sewage, the dosage of ozone is 40mg / L, and the ozone concentration is 50mg / L. The hydraulic retention time is 30min, the treatment effect can be seen image 3 . Its COD removal rate is maintained between 70% and 80%. After treatment, it meet...

Embodiment 3

[0031] Select ceramsite (the particle size range is 5.0-6.8mm, the specific surface area is 1.24m 2 / g), spherical Al 2 o 3 (The particle size range is 3.5-5.0mm, and the BET specific surface area is 168.3m 2 / g) were respectively immersed in 0.6mol / L ferric nitrate solution, after soaking for 4 hours, take it out and dry it at room temperature for 8 hours, dry it in an oven at 105°C for 3 hours, then place it in a muffle furnace at 500°C, and roast it under air atmosphere for 2.5 hours h, cooling for 8h to obtain ceramsite carrier and Al 2 o 3 carrier catalyst.

[0032] Take the ceramsite carrier catalyst with a volume ratio of 20% and fill it at the bottom of the catalytic ozonation reaction column, and then take the Al with a volume ratio of 60%. 2 o 3 The carrier catalyst is loaded on the upper layer of the ceramsite carrier catalyst, and finally 20% lignite-based columnar activated carbon is loaded. This catalyst is used to treat alkali slag wastewater (COD is 3421...

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Abstract

The invention provides a catalyst used for catalyzing ozone oxidation and a preparation method thereof, which solve the technical problem that water quality secondary pollution and catalyst reduced effectiveness due to metal ion loss during a catalyst usage process. The provided catalyst is a mixing carrier catalyst, one or more of ceramsite, spherical Al2O3, spherical SiO2, silica, a molecular sieve and zeolite is dipped in copper and iron, one or more of cerium, manganese, cobalt, nickel, chromium, molybdenum, silver, titanium and vanadium is dipped and roasted in an aqueous solution formed by nitrate or acetate, then the materials and the active carbon with certain volume are used for preparation, and a carrier and the active carbon are preblended and dipped for roasting to obtain the product. The invention also provides a mixing mode for catalyzing an ozone oxidation reaction column (tower) for layered filling, and a purpose of reducing metal loss is achieved. The catalyst and the method can be used for sewage processing field, and especially relates to the deep processing field of industrial sewage.

Description

technical field [0001] The invention relates to a catalytic ozonation catalyst for sewage treatment and a preparation method thereof, which can reduce catalyst loss. Background technique [0002] Catalytic ozonation, as an advanced oxidation technology, has been gradually applied in the research of sewage treatment, especially for difficult-to-treat industrial sewage. Catalytic ozonation technology uses catalysts to catalyze ozone to produce hydroxyl radicals that are more oxidizing than ozone, oxidize and decompose reducing organic matter in sewage, and achieve the purpose of reducing sewage COD. It has a good application prospect in the advanced treatment of sewage. [0003] Among the catalysts used in the existing catalytic ozonation technology, the catalysts with application prospects are transition metal oxides. Activated carbon can be used alone as a catalyst, but the surface properties of activated carbon will change after long-term use as a catalyst, resulting in a ...

Claims

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Application Information

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IPC IPC(8): B01J23/72B01J29/78B01J23/745C02F1/78
Inventor 邱小云赵辉龚小芝刘正
Owner CHINA PETROLEUM & CHEM CORP
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