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Catalyst for decomposing ozone and preparation method thereof

A catalyst and ozone technology, applied in the direction of separation methods, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems of high cost, consumption of catalyst carrier and low service life

Active Publication Date: 2020-06-19
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN201610543720.1 discloses a kind of manganin composite catalyst, potassium permanganate solution, Mn II Salt, Cu II After the salt solution is mixed, it is obtained through a series of steps, but the product needs to be obtained by low-temperature freeze-drying, and the process is relatively special
Invention patent "A device and method for purifying air pollutants" (application number: CN201611008095.7) loads manganese oxide and precious metals on the carrier at the same time to decompose air pollutants, but the cost is too high due to the use of precious metals
In terms of catalytic material research, various noble metals or oxide materials supported by activated carbon have also appeared as catalysts for ozone decomposition, but activated carbon can also be oxidized due to low concentration of ozone (Acta Catalytica Sinica, 2008, 29(4), 335-340) , resulting in the consumption of the catalyst support and the lifespan is not high

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  • Catalyst for decomposing ozone and preparation method thereof
  • Catalyst for decomposing ozone and preparation method thereof
  • Catalyst for decomposing ozone and preparation method thereof

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preparation example Construction

[0014] Aiming at the problem that the activity of the current catalyst for ozonolysis reaction is not high enough, the invention provides a composite material catalyst with high catalytic activity at room temperature, the preparation method of which is simple and convenient, and is beneficial to industrial production. The purpose of the present invention can be achieved through the following technical solutions.

[0015] The application provides a catalyst for decomposing ozone, comprising:

[0016] diatomaceous earth; and

[0017] Fe-doped manganese oxide loaded on diatomaceous earth;

[0018] Wherein the mass ratio of the Mn element in the manganese oxide to the total mass of the catalyst is 2-10%.

[0019] In some embodiments, the mass ratio of the Mn element in the Fe-doped manganese oxide in the catalyst to the total mass of the catalyst is greater than 2.2% or greater than 2.4%, and less than 8% or less than 6%, for example, it can be 2.5%, 3% , 4%, 5%, 6%, 7% or 8%. ...

Embodiment 1

[0050] A manganese oxide composite material loaded with diatomite and doped with iron for catalyzing ozonolysis reaction, the preparation process includes two simple processes of impregnation and calcination. First prepare 200ml of mixed solutions with manganese acetate and ferric nitrate mass fraction concentrations of 20% and 1.5% respectively, add 10g of diatomaceous earth, stir for 30min and then filter, and process the filtered solid in an oven at 80°C for 6 hours to dry Then calcined at 350°C for 50min in an air atmosphere. Such as figure 1 As shown, X-ray powder diffraction analysis shows that the product composition is mainly SiO produced by diatomite pretreatment. 2 and Mn 3 o 4 . Inductively coupled plasma spectroscopic analysis showed that the elemental mass content of Mn and Fe in the composite was 4.9% and 1.46%, respectively. Using the prepared material as a catalyst, the air was passed through the ozone generator at 1 L / min at 25° C. and then flowed through...

Embodiment 2

[0052] Others are the same as in Example 1, except that the calcination temperature is lower, and the filtered solid is heat-treated for 60 minutes at 200° C. in an air atmosphere. X-ray powder diffraction did not observe the diffraction peaks of crystalline oxides of Mn, indicating that the oxides of Mn existed in an amorphous state in the catalyst product, and the mass contents of Mn and Fe were 5.1% and 1.49%, respectively. Using the prepared material as a catalyst, the air was passed through the ozone generator at 1 L / min at a temperature of 25° C. and then flowed through the material, and the ozone decomposition rate was 74%.

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Abstract

The invention discloses a catalyst for decomposing ozone, and a preparation method of the catalyst. The catalyst is prepared from diatomaceous earth and Fe-doped manganese oxide loaded on the diatomaceous earth, wherein the mass of Mn element in the manganese oxide accounts for 2-10% of the total mass of the catalyst. The preparation method of the catalyst comprises the following steps: (1) soaking the diatomaceous earth into a mixed solution of manganese acetate and iron salt, and enabling the diatomaceous earth to be evenly dispersed in the solution, wherein the adding amount of the diatomaceous earth is 25-200g / L; (2) separating the diatomaceous earth out from the solution, drying and then calcining to obtain the catalyst.

Description

technical field [0001] The invention relates to a catalyst material for air purification and a preparation method thereof, in particular to a composite catalyst material capable of accelerating ozone decomposition speed and a preparation method thereof. Background technique [0002] Ozone (O 3 ) is a trace gas in the atmosphere, which is distributed in different altitudes of the earth's atmosphere. Ozone can be produced from oxygen molecules (O 2 ) produced by ultraviolet light or ionization. The ozone layer at an altitude of 20-35 kilometers above the earth's surface protects surface organisms by absorbing ultraviolet rays, while a certain concentration of ozone near the surface is harmful to human health and is currently one of the air quality monitoring indicators of the Ministry of Environmental Protection. Due to the relatively strong oxidation of ozone, 0.1mg / m in the air 3 Concentration of ozone will stimulate the throat, nasal cavity and other organs, 0.2mg / m 3 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/889B01D53/86B01D53/66
CPCB01D53/8675B01D2258/06B01J23/8892B01J35/02Y02A50/20
Inventor 李松秦高梧
Owner NORTHEASTERN UNIV LIAONING
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