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Manganese-iron composite oxide supported catalyst for removing ozone in indoor air

A technology of composite oxides and ferromanganese oxides, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, air quality improvement, etc., can solve the problems of poor moisture resistance and achieve anti-humidity Strong wet performance, no adsorption saturation, good stability

Inactive Publication Date: 2013-05-08
CHANGZHOU POWERWING ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, poor resistance to humidity or the need for additional energy input are the biggest barriers to the widespread application of these catalysts

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The preparation of ferromanganese composite oxides involved in the present invention mainly adopts redox-reflux method:

[0018] Add 400mL deionized water to a 1000mL round bottom flask, MnSO 4 , KMnO 4 and FeCl 2 Add it to make the Mn / Fe molar ratio 2:1, then add 5ml of 20% H 2 SO 4 Make the solution acidic, stir to dissolve it, and reflux the formed black precipitate in an aqueous solution at 80-100°C for 24 hours, filter, wash, dry at 110°C for 12 hours, and then roast at 500°C for 6 hours to obtain Mn / Fe mole MnO with a ratio of 2.0 2 -Fe 2 o 3 Composite oxide powder;

Embodiment 2

[0020] Add 400mL deionized water into a 1000mL round bottom flask, Mn(NO 3 ) 2 , Fe(NO 3 ) 2 and Na 2 S 2 o 8 Add it to make the Mn / Fe molar ratio 10:1, stir to dissolve it, then add 5ml HNO 3 Make the solution acidic, and the resulting black precipitate is vigorously refluxed in an aqueous solution at 80-100°C for 24 hours, filtered, washed, dried at 110°C for 12 hours, and then roasted at 500°C for 6 hours to obtain MnO with a Mn / Fe molar ratio of 10 2 -Fe 2 o 3 Composite oxide powder;

Embodiment 3

[0022] Ag / MnO 2 -Fe 2 o 3 Preparation of Honeycomb Ceramic Monolithic Catalyst I:

[0023] Preparation of ferromanganese composite oxide: the preparation method is the same as in Example 1, and MnO with a Mn / Fe molar ratio of 2.0 is obtained 2 -Fe 2 o 3 Composite oxide powder;

[0024] MnO 2 -Fe 2 o 3 Preparation of composite oxide honeycomb ceramic monolithic catalyst: Weigh a certain amount of MnO 2 -Fe 2 o 3 Composite oxide powder, add a certain proportion of deionized water and silica gel binder, stir at high speed for 6 hours, and get a certain concentration of MnO 2 -Fe 2 o 3 Composite oxide slurry; the pre-treated honeycomb ceramic support is impregnated in MnO 2 -Fe 2 o 3 After 0.5-5 minutes in the composite oxide slurry, take it out, blow off the residual liquid in the channel, dry it in the air at 110°C for 12 hours, and bake it at 500°C for 6 hours to obtain a monolithic catalyst of doped manganese oxide honeycomb ceramics;

[0025] Will get MnO 2 ...

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Abstract

The invention relates to a supported catalyst for removing ozone and a preparation method thereof, and belongs to the field of catalysis and environmental protection. The supported catalyst is characterized in that a honeycomb ceramic carrier or a porous foam metal carrier or an active carbon fiber cloth carrier is adopted, a manganese-iron composite oxide is adopted as a main active component, and silver is adopted as an auxiliary component. The preparation method comprises the following main steps: adopting an oxidation reduction-reflux method to prepare MnO2-Fe2O3 composite oxide powder, adding a certain percentage of deionized water and silica gel, beating to obtain a slurry, placing the catalyst carrier into the slurry to immerse, taking the carrier, drying, baking, placing the catalyst carrier in a soluble silver solution to immerse, taking the carrier, drying, baking, placing the catalyst carrier in hydrogen to heat, and cooling to a room temperature. The catalysts prepared by the method provides high catalysis activity and stability for decomposition of ozone in indoor air, wherein addition inputs of light, electricity, heat and other energy sources are not required, and the ozone can be stably decomposed into oxygen under conditions of a room temperature, normal humidity and large air flow.

Description

technical field [0001] The invention relates to a ferromanganese composite oxide supported catalyst. [0002] The present invention also relates to a method for preparing the above-mentioned catalyst. Background technique [0003] The printer / copier can be said to be the necessary office equipment for every company. The ozone generated by corona discharge and high-voltage discharge during its use is the main source of ozone in the indoor office environment. Low-concentration ozone can disinfect and sterilize bacteria, but high-concentration ozone is extremely harmful to the human body. Studies have shown that ozone can strongly stimulate the human respiratory tract and cause bronchitis and emphysema, and also damage vitamin E in human skin. It can cause wrinkling and dark spots on human skin, and even destroy the immune function of the human body, induce lymphocyte chromosomal changes and cause cancer. The harm caused by ozone has attracted people's attention. In the "Ind...

Claims

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Application Information

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IPC IPC(8): B01J23/889B01D53/86B01D53/66
CPCY02A50/20
Inventor 唐幸福
Owner CHANGZHOU POWERWING ENVIRONMENTAL PROTECTION TECH
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