Preparation method of catalytic wet oxidation catalyst and treatment method of organic wastewater

A catalytic wet oxidation, catalyst technology, applied in the direction of oxidized water/sewage treatment, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc., can solve unfavorable large-scale industrial application, complex catalyst preparation process , loss of active components and other issues, to achieve the effect of accelerating oxidation speed, high catalytic activity and stability, and improving activity

Active Publication Date: 2013-04-17
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] CN1292304A discloses a "rare earth-based supported catalyst for wet oxidation and its preparation method", which provides a Ti-Ce-Bi non-noble metal catalyst for catalytic wet oxidation and its preparation method, and uses rare earth elements instead of noble metals , under the premise of ensuring the high removal rate of wastewater pollutants, the cost of the catalyst is greatly reduced, but the reaction temperature required by the catalyst is relatively high, and the acetic acid removal rate reaches 96% after 1 hour at 230 °C in the acetic acid model reaction, and the loss of active components The problem is still not well resolved
However, the preparation process of the catalyst is complicated, which is not conducive to large-scale industrial application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Spherical γ-Al 2 o 3 After the carrier was pre-dried in an oven, it was pre-soaked in a citric acid solution with a concentration of 0.1mol / L for 60 minutes, dried in an air-atmosphere oven at 80°C for 30 minutes, and then γ-Al 2 o 3 The carrier was impregnated in an aqueous solution prepared by copper nitrate and cerium nitrate, the loading amount was 5% Cu, and the immersion time was 3% Ce for 15 minutes, and then dried in the shade at 20°C with a humidity of 45% for 20 hours. Dry at 80°C for 2 hours, 120°C for 2 hours, and finally place in a muffle furnace and bake at 350°C for 5 hours in an air atmosphere to obtain a catalytic wet oxidation catalyst.

[0022] Take 1g of the catalyst prepared by wet oxidation to degrade 400ml of cellulosic ethanol wastewater. The COD of the wastewater is 102900mg / L, the reaction temperature is 180°C, the total reaction pressure is 6MPa, and the stirring speed is 300r / min. After 2 hours of reaction, the effluent COD removal rate is ...

Embodiment 2

[0024] Spherical SiO 2 After the carrier was pre-dried in an oven, it was pre-soaked in a citric acid solution with a concentration of 1 mol / L for 120 min, and dried in an air-atmosphere oven at 80 °C for 30 min, and then the SiO 2 The carrier was impregnated in an aqueous solution of manganese nitrate and cerium nitrate, the loading amount was 3% Mn, 2% Ce, the immersion time was 30min, and then dried in the shade at 20°C with a humidity of 35% for 20 hours. It was dried in an oven at 80°C for 2 hours, then at 120°C for 2 hours, and finally placed in a muffle furnace and baked at 450°C for 3 hours in an air atmosphere to obtain a catalytic wet oxidation catalyst.

[0025] Take 2g of the prepared catalyst to degrade 400ml of phenol wastewater by wet oxidation. The COD of the wastewater is 10350mg / L, the reaction temperature is 160°C, the total reaction pressure is 5.5MPa, and the stirring speed is 300r / min. After 1 hour of reaction, the COD removal rate of the effluent is 87.8...

Embodiment 3

[0027] Strip TiO 2 After the carrier was pre-dried in an oven, it was pre-impregnated in oxalic acid with a concentration of 0.5 mol / L for 100 min, and dried in an air-atmosphere oven at 80 °C for 15 min, and then the TiO 2 The carrier was impregnated in an aqueous solution of manganese nitrate and lanthanum nitrate, the loading amount was 4% Mn, 2.5% La, the immersion time was 30min, and then dried in the shade at 25°C with a humidity of 30% for 20 hours. Dry in an oven at 80°C for 2 hours, dry at 120°C for 2 hours, and finally place in a muffle furnace and bake at 500°C for 3 hours in an air atmosphere to obtain a catalytic wet oxidation catalyst.

[0028] Take 1.5g of the prepared catalyst to degrade 400ml of oil refinery alkali slag wastewater by wet oxidation. The COD of the wastewater is 35250mg / L, the reaction temperature is 180°C, the total reaction pressure is 5.5MPa, and the stirring speed is 300r / min. It is 90.31%, shows good catalytic activity, reuses this catalys...

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PUM

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Abstract

The invention discloses a preparation method of a catalytic wet oxidation catalyst and a treatment method of organic wastewater. The preparation method comprises the following steps of: (1) taking a porous inert material as a carrier, and performing pre-impregnation treatment on the carrier by adopting an organic acid solution; and (2) preparing an impregnating solution with a water-soluble compound containing transition metal elements and a water-soluble compound containing auxiliary elements, impregnating the carrier after treatment in the step (1) with the impregnating solution, drying in shade for 12-48 hours in air at appropriate humidity, then drying and roasting to obtain a final catalyst. When the catalyst prepared by the method disclosed by the invention is used for high-concentration organic wastewater, the characteristics of high activity, good stability and the like are realized, and the energy consumption and the investment can be reduced.

Description

technical field [0001] The invention belongs to the field of catalysts, in particular to a method for preparing a catalytic wet oxidation catalyst and the application of the catalyst prepared by the method in organic wastewater treatment. Background technique [0002] Compared with other sewage treatment technologies, catalytic wet oxidation is an efficient new treatment technology, especially suitable for the treatment of high-concentration, refractory industrial wastewater, such as coking, printing and dyeing, pesticides, pharmaceuticals, petrochemicals, papermaking and other industrial processes. waste water. The core technology of catalytic wet oxidation is the development of catalysts. The most researched in the early stage is homogeneous catalysts, including Cu, Cr, Mo, Fe, Ni, Co, Mn and other soluble transition metal salts, which have the advantages of high activity and fast reaction speed. , but the metal ions discharged with the wastewater produce secondary pollut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J23/34C02F1/74
Inventor 程明珠王学海刘忠生
Owner CHINA PETROLEUM & CHEM CORP
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