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Preparation method for MnO2-CeO2-CoO/AC ternary supported catalyst for treatment of phenolic wastewater

A mno2-ceo2-coo, supported catalyst technology, applied in the direction of physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problem of affecting the catalytic performance and service life of catalysts , high loss rate of active components, rapid decline in catalytic activity, etc., to avoid deactivation, improve oxidation efficiency, and high practical value

Active Publication Date: 2015-01-28
TIANJIN UNITED ENVIRONMENTAL ENG DESIGN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Catalysts loaded with a single metal oxide often have problems such as poor removal effect and rapid decline in catalytic activity during use, and currently supported activated carbon catalysts are mostly prepared by nitrate, sulfate or chloride impregnation methods. The catalysts prepared by this method The active components are mainly distributed on the outer surface of the activated carbon. During the use of the catalyst, due to the friction before loading the activated carbon, the loss rate of the active components is high, which seriously affects the catalytic performance and service life of the catalyst. At the same time, the preparation process discharges into the environment A lot of NO x , SO 2 、H 2 S, HCl and other pollutants

Method used

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  • Preparation method for MnO2-CeO2-CoO/AC ternary supported catalyst for treatment of phenolic wastewater
  • Preparation method for MnO2-CeO2-CoO/AC ternary supported catalyst for treatment of phenolic wastewater
  • Preparation method for MnO2-CeO2-CoO/AC ternary supported catalyst for treatment of phenolic wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 11.55gC 4 h 6 MnO 4 , 2.12gCe(C 2 h 3 o 2 ) 3 ·nH 2 O, 1.66gC 4 h 6 o 4 Co 4H 2 O is formulated into a mixed solution with a mass concentration of 15%, wherein the ratio of manganese, cerium, and cobalt is 10:1:1. Grind 100g of anthracite into a fineness of more than 90% and pass through 200 mesh raw coal powder, add the mixed solution and 25g of coal tar, knead and pulverize in two stages, after uniform mixing, pelletize through a pelletizing machine, after pelletizing After sieving, the carbon balls with qualified particle size are dried by hot air to complete the secondary pelletizing, and form carbon balls with a particle size of 4mm, which are laid on the smooth cement floor with a thickness of 3-5cm and air-dried for 5 hours; The air-dried charcoal spheres were in N 2 Carbonization is carried out in the atmosphere, the carbonization temperature rise rate is 5°C / min, the final temperature is controlled at about 600°C, and the temperature is kept constan...

Embodiment 2

[0033] In order to compare the effects, under the same process conditions as in Example 1, the following groups of catalysts were compared with the catalysts in Example 1 for comparative experiments.

[0034] 15.73gC 4 h 6 MnO 4 Make a solution with a mass concentration of 15%. Grinding 100g of anthracite into a fineness of more than 90% and passing through 200 meshes of raw coal powder, adding manganese acetate solution and 25g of coal tar, the following preparation steps are different from Example 1 only in that the activator is flue gas The temperature is 900°C, the activation time is 10h, and MnO is obtained 2 / AC supported activated carbon catalyst, the loading of Mn is 5%.

[0035] 11.33gCe(C 2 h 3 o 2 ) 3 ·nH 2 O is made into a solution with a mass concentration of 15%. Grinding 100g of anthracite coal into a fineness of more than 90% and passing through 200 meshes of raw coal powder, adding the cerium acetate solution and 25g of coal tar, the following prepar...

Embodiment 3

[0042] Adopt the MnO that embodiment 1 prepares 2 -CeO 2 -CoO / AC ternary supported activated carbon catalyst catalyzed the degradation of phenolic wastewater by ozonation oxidation. The experimental water is taken from the secondary biochemical effluent of a petrochemical plant containing phenolic wastewater. The wastewater quality: pH value is 7.5, CODcr is 180mg / L; experimental conditions: static small test experiment, catalyst dosage is 100g / L, ozone dosage 50mg / L, the reaction time is 60min, the supernatant is taken every 10min and filtered to measure CODcr, and the single ozone oxidation is used as a comparative effect under the same experimental conditions. See the experimental results image 3 . It can be seen that adding MnO 2 -CeO 2 - The ozone catalytic oxidation system of the CoO / AC three-way supported activated carbon catalyst has a significantly higher removal effect on the CODcr of phenol-containing wastewater than the ozone oxidation system without a cataly...

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Abstract

The invention discloses a preparation method for an MnO2-CeO2-CoO / AC ternary supported catalyst for treatment of phenolic wastewater. The catalyst is prepared by that manganese dioxide, cerium oxide and cobalt oxide are loaded to a carrier activated carbon; the method comprises the following steps: preparing a mixed solution of manganese acetate, cerium acetate and cobaltous acetate with the concentration of 10%-30%, wherein the mass ratio of manganese to cerium to cobalt is (2-10):(1-3):1; adding a binder and the mixed solution into raw material coal dust, wherein the weight ratio of the raw material coal dust to the mixed solution to the binder is 100:(1-20):(20-30), mixing the components, and using an extruding die to extrude the mixture into carbon strips through a forming machine or pelletizing through a pelletizing machine, and sequentially performing air drying, carbonization, activation and aftertreatment on formed carbon strips or carbon balls, so that the ternary supported activated carbon catalyst with the grain size of 2-5 mm is finally obtained. In preparation, secondary pollution to the environment cannot be caused, and the prepared catalyst is good in catalytic effect, low in preparation cost and long in service life, and achieves higher application value.

Description

technical field [0001] The invention relates to the field of catalyst manufacture, in particular to a MnO used for ozone catalytic oxidation treatment of phenol-containing wastewater 2 -CeO 2 -CoO / AC three-way supported activated carbon catalyst and its preparation method, aiming to provide a low-cost, high catalytic activity, and environmentally friendly ozone catalytic oxidation catalyst to achieve the purpose of efficiently degrading phenol-containing wastewater. Background technique [0002] Phenol-containing wastewater mainly exists in industrial wastewater from industries such as coal chemical industry, petrochemical industry, pharmaceutical industry, phenol and phenolic resin production, etc. It contains highly toxic and refractory organic substances such as phenol, chlorophenol, and naphthol, which are harmful to the human respiratory system and nerves. Inhalation, ingestion and absorption through the skin into the human body can cause headaches, coughing, dizziness...

Claims

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Application Information

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IPC IPC(8): B01J23/889C02F1/78C02F101/34
Inventor 石岩许丹宇郑先强孙凯吕晶华余海晨段云霞侯霙张金鸿游洋洋
Owner TIANJIN UNITED ENVIRONMENTAL ENG DESIGN
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