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Composite catalyst for purifying indoor formaldehyde and preparation method of composite catalyst

A composite catalyst, clean room technology, applied in physical/chemical process catalysts, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of reduced catalyst active surface, poor nanoparticle dispersion, poor catalytic decomposition effect, etc. To achieve the effect of convenient and practical operation, simple preparation process and low cost

Inactive Publication Date: 2011-09-28
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these metal oxide catalysts have the problem of agglomeration of nanoparticles. Because the dispersion of nanoparticles is not good, the active surface of the catalyst will be reduced, and the actual use becomes difficult. In addition, generally speaking, the concentration of formaldehyde in the room is low and the degradation rate is relatively fast. Slow, if formaldehyde pollutants cannot be effectively adsorbed to the surface of the catalyst, the catalytic decomposition effect will not be good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0012] The present invention simultaneously designs the preparation method (abbreviation preparation method) of the composite catalyst of formaldehyde in the clean room of the present invention, and the preparation method adopts the following steps: first use KMnO 4 , MnSO 4 Preparation of MnO as raw material 2 Powder, the weight percentage of raw materials is composed of: KMnO 4 1.0~20.0%, MnSO 4 1.0~25.0% (carrier and MnO doped with metal ions 2 The powder weight percentage is 100%); taking the carrier activated carbon as an example, the KMnO 4 The solution is adsorbed on the carrier activated carbon, and then passed through the reducing agent MnSO 4 KMnO on solution and carrier activated carbon 4 reaction so that the MnO 2 The powder is directly deposited on the surface and inside of the carrier activated carbon; then the carrier activated carbon is impregnated in a doped metal ion solution with a weight percentage of 0.5-2.0%, and after rotary evaporation, it is dr...

Embodiment 1

[0021] Weigh 10 g of KMnO 4 and 15.0 g MnSO 4 .H 2 O were prepared into 200ml solutions respectively, 15 grams of activated carbon powder was rinsed with distilled water, boiled for 1 hour, placed in a constant temperature box at 200 ° C for 3 hours, and then poured into the above KMnO 4 In the solution, let it soak for about 30 minutes under magnetic stirring, until the purple in the solution fades, filter out the activated carbon powder, dry naturally at room temperature until the particles do not stick to each other, bake in a drying oven at 120°C for 30 minutes before use; put the above MnSO 4 .H 2 The O solution was poured into the above-mentioned treated activated carbon powder, and the activated carbon powder was required to be immersed in the corresponding MnSO 4 solution, after shaking for 48 hours, filtered, dried at 100°C for 12 hours, and impregnated the dry matter in AgNO with a weight concentration of 1.0%. 3 solution, after rotary evaporation, and drying at...

Embodiment 2

[0024] ZnSO 4 Instead of AgNO in Example 1 3, other raw material groups and process parameters remain unchanged, that is, MnO containing zinc ions can be obtained 2 / activated carbon composite catalyst.

[0025] After testing, when the concentration of formaldehyde in the air is 10mg / L, the removal efficiency of formaldehyde is 95% after the obtained catalyst acts for 12 hours.

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Abstract

The invention discloses a composite catalyst for purifying indoor formaldehyde and a preparation method of composite catalyst. The catalyst consists of 99 to 90 weight percent of carrier and 1 to 10 weight percent of metal ion doped MnO2 powder, wherein the carrier comprises active carbon powder, active carbon fiber powder or molecular sieve porous superfine particles; and the doped metal ions are silver, copper or zinc ions. The preparation method comprises the following steps of: preparing MnO2 powder by using KMnO4 and MnSO4 as raw materials; adsorbing KMnO4 solution on the carrier under the actions of immersion and adsorption, and reacting the MnSO4 solution serving as a reducing agent with the KMnO4 on the carrier so that the MnO2 powder generated by reaction is directly deposited onthe surface and the interior of the carrier; and soaking the carrier into 0.5 to 2.0 percent of metal ion doped solution, performing rotary evaporation, and drying at the temperature of 100 DEG C to prepare the MnO2 / carrier composite catalyst containing doped ions.

Description

technical field [0001] The invention relates to composite catalyst technology, in particular to a composite catalyst for purifying indoor formaldehyde and a preparation method thereof. Background technique [0002] Formaldehyde is an environmental pollutant that has an important impact on the quality of human settlements in urban ecosystems. Indoor formaldehyde has a wide range of sources and a long release period, which is extremely harmful to the human body. In 2004, the International Center for Research on Cancer (IARC) identified formaldehyde as a carcinogen in the No. 153 "Formaldehyde Carcinogenic" Bulletin. It ranks second on the list of priority control of toxic chemicals in our country. The toxicity of formaldehyde includes general toxicity and special toxicity. Long-term (14-30 years) use of formaldehyde and formalin can lead to loss of central nervous system function. Therefore, the control of indoor formaldehyde pollution is urgent. [0003] For indoor forma...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/06B01D53/86B01J35/02B01J23/889B01J23/34B01D53/72B01J23/68
Inventor 张华
Owner TIANJIN POLYTECHNIC UNIV
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