Wet catalytic oxidation catalyst for phenolic wastewater and preparation method thereof, and phenolic wastewater treatment method

A wet catalytic oxidation and catalyst technology, which is applied in the direction of oxidation water/sewage treatment, water/sludge/sewage treatment, physical/chemical process catalyst, etc., can solve the problems of low catalyst cost, high catalyst cost, easy deactivation, etc. Achieve the effect of improving catalytic activity and reducing cost

Inactive Publication Date: 2015-08-12
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In view of the disadvantages of the existing wet catalytic oxidation technology for treating phenol-containing wastewater, such as high catalyst cost, easy deactivation, and harsh catalyst use conditions, the purpose of the present invention is to provide a catalyst for wet catalytic oxidation of phenol-containing wastewater and a preparation method thereof. The catalyst is low in cost and can efficiently degrade phenol solution at relatively low temperature and oxygen partial pressure

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0027] The preparation method of the above-mentioned phenol-containing wastewater wet catalytic oxidation catalyst, the steps are as follows:

[0028] 1) Place activated carbon in a mixed atmosphere of ammonia and nitrogen, wherein the ammonia gas fraction is 1-20%, and after high-temperature ammonification treatment, nitrogen-doped activated carbon is obtained;

[0029] 2) Immerse activated carbon doped with nitrogen in a salt solution containing non-noble metals, dry and roast at a high temperature to obtain a wet catalytic oxidation catalyst for phenol-containing wastewater; the non-noble metal salt solution refers to a salt solution containing Fe ( Such as ferric nitrate, ferric acetate, ferric oxalate solution, etc.).

[0030] Wherein, the temperature of the high-temperature ammoniation treatment described in step 1) is 200-1200° C., and the treatment time is 1-6 hours.

[0031] The mixed atmosphere of ammonia and nitrogen includes a mixed atmosphere directly composed of...

Embodiment 1

[0036] Catalyst preparation

[0037] 1.00 g of activated carbon was placed in a mixed atmosphere of nitrogen and ammonia, where ammonia gas was 10 mL / min and nitrogen gas was 90 mL / min. After ammonification treatment at 400 °C for 2 h, it was naturally cooled to room temperature. Immerse activated carbon after ammonification treatment in 50mL, 5% (ω%) ferric nitrate solution for 4 h, dry it, place it in a tube furnace, roast it in nitrogen at 600 °C for 2 h, take it out, wash it , after drying, the finished catalyst CAT1 was obtained.

[0038] Catalyst activity evaluation

[0039] Catalyst activity was evaluated in a trickle bed reactor, the amount of catalyst was 6.0 mL, the concentration of phenol in the model wastewater was 1000 mg / L, air was used as the oxidant, the feed flow rate was 0.6 mL / min, the reaction temperature was 160 °C, and the reaction pressure was 1.0 MPa, COD was determined by fast closed digestion method, and the concentration of phenol in the effluent w...

Embodiment 2

[0041]1.00 g of activated carbon was placed in a mixed atmosphere of nitrogen and ammonia, where ammonia gas was 20 mL / min and nitrogen gas was 80 mL / min. After ammonification treatment at 800 °C for 4 h, it was naturally cooled to room temperature. Immerse the ammonified activated carbon in 50 mL of 20% (ω%) ferric nitrate solution for 6 h, dry it, place it in a tube furnace, roast it at 400 °C in nitrogen for 3 h, take it out, wash it After cleaning and drying, the finished catalyst CAT2 was obtained. Catalyst activity evaluation is the same as in Example 1, and the results are shown in Table 1.

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Abstract

The invention discloses a wet catalytic oxidation catalyst for phenolic wastewater and a preparation method thereof, and a phenolic wastewater treatment method. The catalyst uses activated carbon as a support, and contains non-metal and non-noble metal elements as active components, wherein the non-metal element is N, and the non-noble metal element is Fe. In the phenolic wastewater treatment process, the catalyst is added into the phenolic wastewater, and the conditions are as follows: the volumetric space velocity is 3-30 / hour, the phenol content in the wastewater is 500-5000 mg / L, the reaction pressure is 0.2-2.0 MPa, and the reaction temperature is 100-250 DEG C. By using the non-noble metal as the active component, the cost of the catalyst can be lowered. The catalyst can implement degradation of high-concentration phenol wastewater under the conditions of lower temperature and oxygen pressure. The nitrogen element is introduced into the activated carbon support surface, and the synergistic action of the nitrogenous functional group on the activated carbon surface and the non-noble metal active component is utilized to enhance the catalytic activity of the catalyst.

Description

technical field [0001] The invention relates to a catalyst, in particular to a catalyst for wet catalytic oxidation treatment of phenol-containing wastewater and a preparation method thereof; the invention also provides a treatment method for phenol-containing wastewater based on the catalyst, which belongs to the technical field of wastewater treatment. Background technique [0002] Phenol-containing wastewater widely exists in coal chemical industry, petrochemical plant, pharmaceutical factory, phenol and phenolic resin and other enterprises' effluent wastewater. Due to the high toxicity and difficult biochemical degradation of phenol and its derivatives, phenol-containing wastewater has been listed as one of the key harmful wastewater by countries all over the world. At present, the treatment methods for phenolic wastewater mainly include: biological treatment, physical treatment, chemical oxidation, photocatalytic oxidation, ozone catalytic oxidation, electrochemical o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C02F1/72C02F101/34
Inventor 杨郭刘兴勇曾凡炎袁基刚张峰榛
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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