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Perovskite ozone decomposition catalyst and preparation method and application thereof

A perovskite type, ozone decomposition technology, which is applied in the field of air pollution purification, can solve the problems of large interference of catalytic performance and inability to meet the requirements of ozone catalytic treatment, and achieve the effect of simple process, excellent catalytic decomposition activity and mild synthesis conditions

Active Publication Date: 2017-11-24
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The above-mentioned patents have obtained transition metal oxide ozonolysis catalysts, but their catalytic performance is greatly disturbed by humidity, and cannot meet the catalytic treatment of ozone under high humidity conditions.

Method used

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  • Perovskite ozone decomposition catalyst and preparation method and application thereof
  • Perovskite ozone decomposition catalyst and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Prepare the perovskite type ozonolysis catalyst according to the following method:

[0043] (1) Dissolve lanthanum nitrate, ferric nitrate, and citric acid in deionized water at a molar ratio of 1:1:2, stir and dissolve to obtain a mixed solution with a concentration of lanthanum nitrate of 1mol / L; slowly add ammonia water dropwise to the mixed solution to adjust The pH value of the solution was 6.5. During this process, the solution gradually changed from reddish brown to yellow-green sol. The sol was transferred to an oil bath at 70°C and stirred for 4 hours to form a yellow-green gel;

[0044] (2) Transfer the gel obtained in step (1) to a porcelain boat and place it in a constant temperature drying oven at 130°C to dry for 12 hours. The yellow-green gel turns into a dark green xerogel; When the material is ignited, the material will self-propagate and burn. During the process, the material gradually turns into yellow coral-like particles and releases a large amount ...

Embodiment 2

[0051] Prepare the perovskite type ozonolysis catalyst according to the following method:

[0052] (1) lanthanum nitrate, ferric nitrate, copper nitrate, citric acid are dissolved in deionized water according to the molar ratio of 1:0.95:0.05:2, stirring and dissolving to obtain the mixed solution that the concentration of lanthanum nitrate is 1.5mol / L; Slowly add ammonia water dropwise to adjust the pH value of the solution to 6.8. During this process, the solution gradually changes from reddish brown to yellow-green sol. Transfer the sol to an oil bath at 65°C and stir for 3 hours to form a yellow-green gel;

[0053] (2) Transfer the gel obtained in step (1) to a porcelain boat and place it in a constant temperature drying oven at 100°C to dry for 12 hours. The yellow-green gel will turn into a dark green xerogel; When the material is ignited, the material will self-propagate and burn. During the process, the material gradually turns into yellow-green coral-like particles an...

Embodiment 3

[0059] Prepare the perovskite type ozonolysis catalyst according to the following method:

[0060] (1) Dissolve lanthanum nitrate, ferric nitrate, nickel nitrate, citric acid in deionized water according to the molar ratio of 1:0.9:0.1:2, stir and dissolve to obtain a mixed solution whose concentration of lanthanum nitrate is 2mol / L; Slowly add ammonia water to adjust the pH value of the solution to 7. During this process, the solution gradually changes from reddish brown to yellow-green sol. Transfer the sol to an oil bath at 90°C and stir for 3.5 hours to form a yellow-green gel;

[0061] (2) Transfer the gel obtained in step (1) to a porcelain boat and place it in a constant temperature drying oven at 120°C to dry for 15 hours. The yellow-green gel will turn into a dark green xerogel; When the material is ignited, the material will self-propagate and burn. During the process, the material gradually turns into dark green coral-like particles and releases a large amount of am...

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Abstract

The invention relates to a perovskite ozone decomposition catalyst. The active component of the catalyst is pure-phase or transition metal-doped perovskite lanthanum ferrite, wherein the structural formula of the active component of the catalyst is LaMxFe(1-x)O3, wherein M is a transition metal and x is smaller than or equal to 0.2 and greater than or equal to 0. Ferric nitrate, lanthanum nitrate, nitrate of optional transition metal and citric acid ae taken as raw materials, the perovskite ozone decomposition catalyst is synthesized by adopting sol-gel auto-combustion method, and a catalyst with a perovskite crystal phase is obtained through grinding, burning and loading; and the grain size of the obtained catalyst is 10-100nm and the specific surface area is 5-50m<2> / g. The catalyst has excellent catalytic performance on ozone at a room temperature, especially has good humidity resistance, can be applied to catalytic decomposition of the ozone in a high-humidity environment, is simple in preparation technology and mild in condition, and has a good application prospect.

Description

technical field [0001] The invention relates to the field of air pollution purification, in particular to a perovskite type ozone decomposition catalyst and its preparation method and application. Background technique [0002] Ozone is one of the main pollutants in the air when the ultraviolet rays are strong in summer. In addition to the generation of ultraviolet radiation, the release of ozone used as an antibacterial agent and disinfectant in industrial production and the generation of high-voltage discharges when indoor electrical appliances such as copiers and scanners work are also the main sources of ozone pollution in indoor and outdoor air. Ozone has great harm to human health. my country's "Ambient Air Quality Standard GB3095-2012" stipulates that the first and second standards are respectively not more than 0.16 and 0.20mg / m3 (about 0.08 and 0.10ppm) in one hour. The air quality standard GB / T 18883-2002 stipulates that the 1-hour average value of indoor air should...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01D53/86B01D53/66
CPCB01D53/8675B01D2255/2063B01D2255/20738B01D2255/20746B01D2255/20753B01D2255/20761B01J23/83Y02A50/20
Inventor 巩书燕韩宁陈运法
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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