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Use of manganite catalyst in catalytic oxidation of formaldehyde

A manganese oxide and catalytic oxidation technology, which is applied in the field of catalytic oxidation of formaldehyde and manganese oxide catalysts, can solve problems such as high temperature and cannot meet practical applications, achieve low ignition temperature, reduce harm to human health and ecological environment, The effect of simple and easy preparation process

Active Publication Date: 2015-11-04
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

They require high temperature to completely remove formaldehyde under high load, that is, high space velocity and high formaldehyde concentration (100000mL / (g h) and 170ppm), which cannot meet the practical application

Method used

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  • Use of manganite catalyst in catalytic oxidation of formaldehyde
  • Use of manganite catalyst in catalytic oxidation of formaldehyde
  • Use of manganite catalyst in catalytic oxidation of formaldehyde

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Prepare α, β, γ and δ crystal forms of manganese dioxide in the following manner:

[0031] With manganese sulfate as reducing agent, potassium permanganate or ammonium persulfate as oxidant, the manganese dioxide catalyst of α, β, γ and δ crystal forms is prepared by hydrothermal synthesis, as follows:

[0032] Add the required precursor (i.e. oxidizing agent and reducing agent) (X) and 80 mL deionized water to a 100 mL hydrothermal reaction kettle, thoroughly dissolve the precursor by stirring, and then place it in a constant temperature incubator with a certain reaction temperature (Y). React for a certain period of time (Z), and then filter, wash, and dry the contents of the reactor overnight, and then calcinate in air at 300°C. The following table lists the specific values ​​for X, Y, Z.

[0033]

X

Y

Z

α-MnO 2

MnSO 4 ·H 2 O+KMnO 4

160℃

24h

β-MnO 2

MnSO 4 ·H 2 O+(NH 4 ) 2 S 2 O 8

140℃

1...

Embodiment 2

[0037] The α, β, γ and δ crystal forms of manganese dioxide were prepared in the same manner as in Example 1.

[0038] At a concentration of 170 ppm, a space velocity of 150,000 mL / (g h), and a temperature of 75 °C, the δ-crystalline manganese dioxide can maintain a 60% conversion rate for 50 h. α, β, γ are under the same conditions. Under the test, its activity gradually decreased after 5h.

Embodiment 3

[0040] The α, β, γ and δ crystal forms of manganese dioxide were prepared in the same manner as in Example 1.

[0041] The relevant parameters of the catalytic formaldehyde activity of the manganese dioxide of the four crystal forms are listed in the following table, arranged in descending order of activity. Test conditions: concentration 5ppm, space velocity 5000mL / (g·h).

[0042]

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Abstract

The invention provides a use of a manganite catalyst in catalytic oxidation of formaldehyde. The manganite is gamma or / and delta crystal form manganese dioxide. The delta crystal form manganese dioxide as a formaldehyde catalytic oxidation catalyst has the advantages of 1, a formaldehyde catalytic oxidation ignition temperature is low, a conversion ratio is 37% under conditions of a high formaldehyde concentration of 170ppm, a high airspeed of 100000mL / (g.h) and a temperature of 50 DEG C, conversion is complete at a temperature of 80 DEG C and the activity of the unprecious metal catalyst is high on the list, and 2, stability is excellent, the crystal form before and after catalytic reaction is stable and a catalytic conversion rate is kept in a long-term activity test.

Description

technical field [0001] The invention belongs to the technical field of formaldehyde catalysis, and in particular relates to the use of a manganese oxide catalyst for catalytic oxidation of formaldehyde. Background technique [0002] As a binder, formaldehyde has the functions of strengthening the hardness of artificial floors, preventing insects, and preventing corrosion, so it is widely used in furniture and decoration materials. On the other hand, formaldehyde is also gradually released from the adhesive into the surrounding environment, which leads to serious pollution of the indoor air. The test results of the Indoor Environment Testing Committee of China Interior Decoration Association also show that formaldehyde has become the main pollutant in newly decorated rooms in China. Exposure to a certain amount of formaldehyde gas for a long time can irritate the eyes, nose, throat and other organs in mild cases, and cause fatigue and allergic reactions in severe cases, and ...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/72B01J23/34
Inventor 贺泓张江浩张长斌李要彬王莲
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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