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Preparation method of catalyst for ozone decomposition

An ozone decomposition and catalyst technology, which is applied in catalyst activation/preparation, separation methods, chemical instruments and methods, etc., and can solve problems such as short lifespan

Active Publication Date: 2018-09-28
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although many units in China have carried out research on ozonolysis catalysts, there are no practically applicable ozonolysis materials in China, and the currently used ozonolysis catalysts are all imported from abroad.
On the other hand, commonly used ozonolysis catalysts have a short lifetime in humid environments, so it is necessary to seek an ozonolysis catalyst with good catalytic stability in humid environments

Method used

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  • Preparation method of catalyst for ozone decomposition
  • Preparation method of catalyst for ozone decomposition
  • Preparation method of catalyst for ozone decomposition

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preparation example Construction

[0038] The preparation method of the above-mentioned catalyst for ozonolysis uses ammonium salt to handle birnessite type manganese dioxide, due to NH 4 + The ions in the solution have a certain damage to the structure of the birnessite-type manganese dioxide formed, thereby increasing the specific surface area of ​​the birnessite-type manganese dioxide catalyst and oxygen defects on the catalyst surface, and also increasing the surface acidity of the catalyst , thereby improving the catalytic activity of the birnessite-type manganese dioxide catalyst, and the prepared catalyst can still maintain a good catalytic effect on the ozone decomposition reaction in a humid environment. The preparation process does not require high temperature and high pressure, and has the advantages of simple preparation process and low cost The advantages are low cost, and the prepared catalyst can still maintain a good catalytic effect on the ozonolysis reaction in a humid environment.

[0039] I...

Embodiment 1

[0047] 3g KMnO 4 Add to a 250mL Erlenmeyer flask, add 100mL deionized water thereto, then place the Erlenmeyer flask into a constant temperature water bath at 40°C and magnetically stir the contents of the Erlenmeyer flask. Wait for KMnO 4 After the solid was completely dissolved, 15 g of CH was added 3 OH, continue magnetic stirring for 6h. After the reaction, the mixture in the Erlenmeyer flask was filtered and cleaned with deionized water to obtain a solid. The washed solid sample was put into an oven at 105°C for 12 hours to be heated and dried to obtain birnessite-type manganese dioxide.

[0048] Add 2g of dried birnessite-type manganese dioxide powder into a 100mL beaker, and add 40mL of 15g / L NH 4 Cl solution, the beaker was placed in a constant temperature water bath at 30°C and the mixture in the beaker was continuously magnetically stirred for 3h. After the reaction, the reacted mixture in the beaker was filtered and cleaned with deionized water to obtain a prod...

Embodiment 2

[0051] 3g NaMnO 4 Add it to a 250mL conical flask, then add 50mL deionized water therein, place the conical flask into a constant temperature water bath at 60°C and magnetically stir the contents in the conical flask. NaMnO 4 After the solids were completely dissolved, 30 g of CH 3 CH 2 OH, magnetically stirred for 12h. After the reaction, the mixture in the Erlenmeyer flask was filtered and cleaned with deionized water and filtered to obtain a solid. The washed solid sample was put into an oven at 105°C for 12 hours to be heated and dried to obtain birnessite-type manganese dioxide. The birnessite type manganese dioxide powder after 2g drying is added in the 100mL beaker, adds 40mL 60g / L thereinto (NH 4 ) 2 SO 4 solution, the beaker was placed in a constant temperature water bath at 50°C and the mixture in the beaker was continuously magnetically stirred for 8h. After the reaction, the reacted mixture in the beaker was filtered and washed with deionized water to obtai...

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Abstract

The invention provides a preparation method of a catalyst for ozone decomposition. The preparation method comprises the following steps: S1, adding a reducing agent into permanganate water solution, heating, and continuously stirring to obtain birnessite manganese dioxide; and S2, adding the birnessite manganese dioxide into an ammonium salt water solution, heating and continuously stirring to obtain the catalyst.

Description

technical field [0001] The invention relates to the field of catalysts, in particular to a method for preparing a catalyst for ozone decomposition. Background technique [0002] Ozone is a common air pollutant, long-term exposure to low concentrations of ozone will have an impact on human health. Ozone pollutants are produced in offices with copiers and printers and in indoor spaces equipped with electrostatic precipitators or ionized air cleaners. my country's "Ambient Air Quality Standard" (GB3095-2012) updated in 2012 stipulates that the daily maximum 8-hour average ozone concentration limit is 100μg / m 3 (primary standard) and 160μg / m 3 (Secondary standard), the 1-hour average ozone concentration limit is 160μg / m 3 (primary standard) and 200μg / m 3 (secondary standard). In addition, my country's "Special Requirements for Air Purifiers with Antibacterial, Sterilizing, and Purifying Functions for Household and Similar Electrical Appliances" (GB21551.3-2010) also stipula...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01D53/86B01D53/66
CPCB01D53/8675B01J23/34B01J37/031B01J37/16B01J37/08B01D2255/2073B01D2255/2027C01G45/02C01G45/1228C01P2004/03C01P2004/04C01P2002/72C01P2002/82C01P2002/85C01P2006/14C01P2006/16B01D53/81B01D2255/9205B01D2255/9207B01D2255/2022B01D2258/06B01D2257/106B01J35/30B01J35/23B01J37/0236B01J37/04B01J37/30
Inventor 张彭义曹冉冉刘阳
Owner TSINGHUA UNIV
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