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Preparation method of composite metal oxide ozone catalyst

A composite metal and catalyst technology, applied in the field of water treatment, can solve the problem that the surface properties of ozone catalysts are easily changed and reused, and achieve high catalytic activity and stability, wide application and broad market prospects

Pending Publication Date: 2020-10-30
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] Book The invention provides a composite metal oxide ozone catalyst CoO-CeO / γ-Al in order to solve the problem of the easy change of the surface properties of the ozone catalyst and the reuse rate 2 o 3 The preparation method, the catalyst has high catalytic activity and stability, is green and environmentally friendly, and can be recycled many times

Method used

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  • Preparation method of composite metal oxide ozone catalyst
  • Preparation method of composite metal oxide ozone catalyst

Examples

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Effect test

Embodiment 1

[0032] a. Activation of γ-Al 2 o 3 Ball carrier: industrial grade γ-Al 2 o 3 , carrier particle size Specific surface 300m 2 / g, pore volume 0.40m / g, abrasion 2 o 3 The ball is soaked in dilute sulfuric acid solution with pH=4 for 24 hours, washed with deionized water for 3 times until neutral, then boiled in deionized water for 3 times, washed with deionized water for 3 times until neutral, and dried in an oven at 105°C. Dry for 2 hours to obtain activated γ-Al 2 o 3 Ball carrier;

[0033] b. Preparation process of excessive impregnation method: prepare 0.5mol / L cerium nitrate and 0.5mol / L cobalt nitrate solutions respectively, and activate γ-Al in step (1) 2 o 3 Add 0.5mol / L cerium nitrate to the spherical carrier according to the dosage of 5g / L, shake and impregnate in a water bath at 60°C for 24 hours, filter out the impregnated matter with filter paper after impregnating, and put the filtered impregnated matter into 0.5mol / L L cobalt nitrate, shake and impregna...

Embodiment 2

[0038] a. Activation of γ-Al 2 o 3 Ball carrier: industrial grade γ-Al 2 o 3 , carrier particle size Specific surface 300m 2 / g, pore volume 0.4m / g, abrasion 2 o 3 The ball is first soaked in dilute sulfuric acid solution with pH=4 for 24 hours, washed with deionized water for 4 times until neutral, then boiled in deionized water for 3 times, then washed with deionized water for 4 times until neutral, and dried in an oven at 90°C. Dry for 2 hours to obtain activated γ-Al 2 o 3 Ball carrier;

[0039] b. Preparation process of excessive impregnation method: prepare 0.2mol / L cerium nitrate and 0.1mol / L cobalt nitrate solutions respectively, and activate γ-Al in step (1) 2 o 3 Add 0.2mol / L cerium nitrate to the spherical carrier according to the dosage of 8g / L, shake and impregnate in a water bath at 80°C for 36 hours, filter the impregnated matter with filter paper after impregnating, and put the filtered impregnated matter into 0.2mol / L L cobalt nitrate, shake and imp...

Embodiment 3

[0044] a. Activation of γ-Al 2 o 3 Ball carrier: industrial grade γ-Al 2 o 3 , carrier particle size Specific Surface 350m 2 / g, pore volume 0.40m / g, abrasion 2 o 3 The ball is soaked in dilute sulfuric acid solution with pH=4 for 24 hours, washed with deionized water for 5 times until neutral, then boiled in deionized water for 3 times, washed with deionized water for 5 times until neutral, and dried in an oven at 90°C. Dry for 2 hours to obtain activated γ-Al 2 o 3 Ball carrier;

[0045] b. The preparation process of excessive impregnation method: respectively prepare 0.7mol / L cerium nitrate and 0.5mol / L cobalt nitrate solutions, and activate γ-Al in step (1) 2 o 3 Add 0.7mol / L cerium nitrate to the ball carrier according to the dosage of 7g / L, shake and impregnate in a water bath at 80°C for 30h, filter out the impregnated matter with filter paper after impregnation, and put the filtered impregnated matter into 0.5mol / L Cobalt nitrate, shake and impregnate in a w...

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Abstract

The invention belongs to the technical field of environmental protection, and provides a preparation method of a composite metal oxide ozone catalyst, which comprises the steps of: soaking industrial-grade gamma-Al2O3 with a dilute sulfuric acid solution, washing the industrial-grade gamma-Al2O3 with deionized water to achieve a neutral state, and boiling and drying the industrial-grade gamma-Al2O3 to obtain an activated gamma-Al2O3 sphere ball carrier; and sequentially putting the activated gamma-Al2O3 sphere carrier into a cerous nitrate solution and a cobalt nitrate solution, performing water bath impregnation, drying and the like to obtain the gamma-Al2O3 sphere carrier loaded with a cerous nitrate precursor and a cobalt nitrate precursor, and calcining the gamma-Al2O3 sphere carrier to obtain the final product composite metal oxide ozone catalyst CoO-CeO / gamma-Al2O3. The COD removal efficiency of the catalyst is 4.3%-11.9% higher than that of similar products sold in the market, the ammonia nitrogen removal efficiency of the catalyst is 28.2%-37.1% higher than that of similar products sold in the market, the catalytic efficiency of the catalyst is high, the catalyst has high stability, and the catalyst is widely applied to the actual water treatment process and has a wide market prospect.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a preparation method of a composite metal oxide ozone catalyst. Background technique [0002] In recent years, the public's requirements for the quality of the ecological environment have become higher and higher, the country's emphasis on environmental pollution control has continued to increase, and my country's sewage discharge standards have also continued to improve. At present, my country's sewage plants implement the "Discharge Standards of Pollutants for Urban Sewage Treatment Plants" (GB18918-2002) Class A discharge standards. In addition, many provinces and cities have formulated local water pollution discharge standards, and all of them have made stricter regulations on the discharge of urban sewage treatment plants. Among them, the 2018 "Daqing River Basin Water Pollutant Discharge Standard" (DB13 / 2795-2018) and other standards in Hebei Province raised the li...

Claims

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Application Information

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IPC IPC(8): B01J23/83C02F1/78
CPCB01J23/83B01J23/002C02F1/78C02F1/725B01J2523/00B01J2523/31B01J2523/3712B01J2523/845
Inventor 刘艳芳陈嘉鑫吴志杰童嘉鹏于菲王书梦王庆斌
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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