Catalyst for decomposing ozone, and preparation method of catalyst

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

Active Publication Date: 2018-02-02
NORTHEASTERN UNIV
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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 of catalyst
  • Catalyst for decomposing ozone, and preparation method of catalyst
  • Catalyst for decomposing ozone, and preparation method of catalyst

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[0014] Aiming at the problem that the activity of the current ozone decomposition reaction catalyst is not high enough, the present invention provides a composite material catalyst with high catalytic activity at room temperature, and the preparation method is simple and convenient for industrial production. The object 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 supported on diatomaceous earth;

[0018] 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%, such as 2.5%, 3% , 4%, 5%, 6%, 7% or 8%.

[0020] In some embodiments, ...

Embodiment 1

[0050] A diatomite-supported iron-doped manganese oxide composite material for catalyzing ozonolysis, the preparation process of which includes two simple processes of impregnation and calcination. First, prepare 200 ml of a mixed solution with manganese acetate and ferric nitrate concentration of 20% and 1.5%, add 10g of diatomaceous earth, stir for 30min, filter, and treat the filtered solid in a drying box at 80°C for 6 hours to dry Then, it was calcined at 350 °C for 50 min in an air atmosphere. like figure 1 X-ray powder diffraction analysis shows that the product is mainly composed of SiO formed by pretreatment of diatomite 2 and Mn 3 O 4 . Inductively coupled plasma spectroscopy analysis showed that the elemental mass contents of Mn and Fe in the composites were 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 the above material, and the ozone decompo...

Embodiment 2

[0052] Others are the same as in Example 1, except that the calcination temperature is lower, and the solid obtained by filtration is heat-treated at 200° C. in an air atmosphere for 60 minutes. No diffraction peaks of Mn crystalline oxides were observed by X-ray powder diffraction, indicating that Mn oxides in the catalyst product existed in an amorphous state, and the elemental 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 an ozone generator at 1 L / min at a temperature of 25° C. and then flowed through the above 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 that is distributed at different altitudes in the Earth's atmosphere. Ozone can be produced by oxygen molecules (O 2 ) is produced by UV illumination or ionization. The ozone layer at a height of 20-35 kilometers on the earth's surface protects surface organisms by absorbing ultraviolet rays, while a certain concentration of ozone near the surface is detrimental to human health. It is one of the current air quality monitoring indicators of the Ministry of Environmental Protection. Due to the strong oxidizing effect of ozone, 0.1mg / m2 in the air 3 Concentration of ozone will stimulate the throat, nasal cavity and other organs, 0.2mg / m 3 Concentrat...

Claims

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Application Information

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