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Catalytic ozonation catalyst as well as preparation method and application thereof

A technology of ozone catalytic oxidation and catalyst, which is applied in the field of water treatment, can solve the problems of poor stability, low activity and short life, and achieve the effects of stable performance, increased catalytic activity and long service life

Active Publication Date: 2021-05-14
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, in the pretreatment of high-concentration, biochemically difficult, and toxic organic wastewater (such as pharmaceutical, petrochemical, coking, coal chemical, leather, electrophoretic coating, pickling and fermentation wastewater), conventional catalysts in ozone catalytic oxidation technology have low activity. , poor stability, short life, etc.

Method used

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  • Catalytic ozonation catalyst as well as preparation method and application thereof
  • Catalytic ozonation catalyst as well as preparation method and application thereof
  • Catalytic ozonation catalyst as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] In this embodiment, a catalyst of the present invention is prepared, and its catalytic activity is tested.

[0056] The specific preparation method is:

[0057] γ-Al 2 o 3 The powder is placed in a vacuum oven for 3 hours in a vacuum;

[0058] With 0.741g 50% (mass fraction) manganese nitrate solution, 0.435g Co(NO 3 ) 2 ·6H 2 O, 0.303g Ce(NO 3 ) 2 ·6H 2 O, 0.365g Cu(NO 3 ) 2 ·3H 2 O, 0.505g Ca(NO 3 ) 2 4H 2 O was dissolved in 30ml of deionized water, stirred at room temperature for 2h;

[0059] 6g of processed γ-Al 2 o 3 Add the carrier to the metal salt solution and stir for 4h;

[0060] The impregnation solution and ammonia water (concentration 10%) were added dropwise to the same beaker, and the precipitation solution was continuously stirred during this process, and the dropping speed of the two solutions was controlled so that the pH value of the precipitation solution was controlled at 10. Continue to stir for 3h after the dropwise addition is c...

Embodiment 2

[0066] In this embodiment, a catalyst of the present invention is prepared, and its catalytic activity is tested.

[0067] The specific preparation method is:

[0068] γ-Al 2 o 3 The powder is placed in a vacuum oven for 3 hours in a vacuum;

[0069] 0.741g 50% manganese nitrate solution, 0.218g Co(NO 3 ) 2 ·6H 2 O, 0.151g Ce(NO 3 ) 2 ·6H 2 O, 0.2g Ni(CH 3 COO) 2 4H 2 O, 0.909g Fe(NO 3 ) 2 9H 2 O, 0.505g Ca(NO 3 ) 2 4H 2 O was dissolved in 30ml of deionized water, stirred at room temperature for 2h;

[0070] 6g of processed γ-Al 2 o 3 Add the carrier to the metal salt solution and stir for 4h;

[0071] The impregnation solution and ammonia water (concentration 10%) were added dropwise to the same beaker, and the precipitation solution was continuously stirred during this process, and the dropping speed of the two solutions was controlled so that the pH value of the precipitation solution was controlled at 10. Continue to stir for 3h after the dropwise addi...

Embodiment 3

[0077] In this embodiment, a catalyst of the present invention is prepared, and its catalytic activity is tested.

[0078] The specific preparation method is the same as in Example 1, the difference is only: adopt 0.741g 50% (mass fraction) manganese nitrate solution, 0.435g Co(NO 3 ) 2 ·6H 2 O, 0.303g Ce(NO 3 ) 2 ·6H 2 O, 0.365g Cu(NO 3 ) 2 ·3H 2 O, 0.253g Ca(NO 3 ) 2 4H 2 O.

[0079] Obtain catalyst Mn(3%)-Co(2%)-Ce(2%)-Cu(2%)-Ca(1%) / γ-Al 2 o 3 .

[0080] Catalyst activity test:

[0081] COD cr 100ml of industrial waste water of 295mg / L (pH value is 6.5), with ozone as oxidant continuous dosing, gas flow rate is 62ml / min, O 3 The gas phase concentration is 27mg / L, and the catalyst consumption is 5g.

[0082] When reacting for 15 minutes, the COD of the wastewater by the catalyst cr The removal rate was 35%, and the removal rate was 39% at 30 minutes. The catalyst works quickly and the catalytic efficiency is stable.

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Abstract

The invention relates to the technical field of water treatment and particularly discloses a catalytic ozonation catalyst as well as a preparation method and application thereof. The catalytic ozonation catalyst comprises a carrier, an active component and an auxiliary agent. The carrier is gamma-Al2O3, the active component is an oxide of Co and one or more of oxides of Mn, Ce, Cu, Ni and Fe, and the auxiliary agent is an oxide of Ca. The invention also provides a preparation method of the catalyst. Compared with a catalyst prepared by directly impregnating an active component in a traditional carrier, the catalyst provided by the invention has the advantages of tight combination of the carrier and the active component, difficult loss of the active component, high catalytic activity, stable catalytic performance, long service life and the like. The method is suitable for treating industrial wastewater with high CODcr concentration and complex organic matter composition.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to an ozone catalytic oxidation catalyst and its preparation method and application. Background technique [0002] With the continuous advancement of industrialization, water pollution has become a major problem in environmental governance, and industrial wastewater is the main cause of water pollution. The discharge of industrial wastewater will cause serious water pollution and cause certain damage to the surrounding ecological environment. And it will also pose a great threat to human health. Therefore, with the continuous improvement of industrial wastewater discharge standards in industrial production, industrial wastewater treatment has gradually received attention. [0003] Due to its complex composition (including polycyclic aromatic hydrocarbons, halogenated benzene and other benzene series, unsaturated aldehydes and ketones, amides, nitrogen-containing heterocycle...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01J37/02B01J37/03C02F1/72C02F1/78C02F101/30
CPCB01J23/8892B01J37/035B01J37/0207C02F1/725C02F1/78C02F2101/30
Inventor 王斌崔跃宗余刚黄冬梅吴颖
Owner TSINGHUA UNIV
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