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Preparation method and application of manganese oxide-loaded molecular sieve composite material

A composite material and manganese oxide technology, applied in the field of preparation of molecular sieve composite materials, can solve the problems of inability to industrialize production, secondary pollution, easy desorption, etc., and achieve the effects of easy industrialization, high purification rate, and cheap raw materials

Pending Publication Date: 2022-03-15
佛山(华南)新材料研究院 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, physical adsorption is the most common air purification treatment technology. Activated carbon has a good adsorption effect on most air pollutants, but pure activated carbon adsorption is easy to absorb and saturate, and it is extremely easy to desorb with changes in humidity and temperature. , easy to cause secondary pollution
Studies have shown that transition metal oxides MnO 2 For the removal effect of formaldehyde, the supported noble metal catalyst can completely catalyze the oxidation of formaldehyde at room temperature, but its cost is too high to be industrialized

Method used

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  • Preparation method and application of manganese oxide-loaded molecular sieve composite material
  • Preparation method and application of manganese oxide-loaded molecular sieve composite material

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preparation example Construction

[0030] The invention provides a kind of preparation method of the molecular sieve composite material of loaded manganese oxide, comprising the following steps:

[0031] S1, carry out acidification heat treatment to molecular sieve and dry, put the molecular sieve after drying into hydrogen peroxide solution to soak and take out, then place in N at 600~800 ℃ 2 and H 2 Take out the mixed gas after reacting for a preset time;

[0032] S2, put the molecular sieve obtained in step S1 into the divalent manganese solution, add potassium permanganate solution after dipping, and stir to react;

[0033] S3, washing and drying the molecular sieve obtained in step S2 to obtain a finished product;

[0034] In step S2, the mass concentration of the molecular sieve in the divalent manganese solution is 0.1 to 1 g / L; the ratio of the addition of the divalent manganese solution to the potassium permanganate solution is (1 to 3): (1 to 3).

[0035] The preparation method of the manganese ox...

Embodiment 1

[0047] A preparation method of a manganese oxide-loaded molecular sieve composite material, comprising the following steps:

[0048] S1. Take 2 g of ZSM-5 molecular sieve with a silicon-alumina ratio of 220, add it to 100 mL of a sulfuric acid solution with a concentration of 0.5 mol / L, and perform an acidification heat treatment for 80 min under stirring in a water bath at 80 °C. Dry to constant weight.

[0049] S2. Put the dried molecular sieve into a hydrogen peroxide solution with a mass concentration of 0.5 mol / l, soak it for 40 minutes, take it out, and then place it in N at 800°C. 2 and H 2 Take out after 80min of reaction in the mixed gas.

[0050] S3, the ZSM-5 molecular sieve obtained in step S2 is immersed in 100 mL of manganese sulfate solution with a concentration of 0.05 mol / L, and after immersion for 30 min, a potassium permanganate solution with a concentration of 0.05 mol / L is added dropwise under stirring, The total dropwise amount of potassium permanganat...

Embodiment 2

[0053] A preparation method of a manganese oxide-loaded molecular sieve composite material, comprising the following steps:

[0054] S1. Take 2 g of ZSM-11 molecular sieve with a silicon-alumina ratio of 300, add it to 100 mL of a sulfuric acid solution with a concentration of 0.5 mol / L, and stir under the heating condition of a water bath at 80 °C for 80 minutes of acidification heat treatment. Dry to constant weight.

[0055] S2. Put the dried molecular sieve into a hydrogen peroxide solution with a mass concentration of 1 mol / l, soak it for 30 minutes, take it out, and then place it in N at 700°C. 2 and H 2 Take out after 60min of reaction in the mixed gas.

[0056] S3, the ZSM-11 molecular sieve obtained in step S2 is immersed in 100 mL of manganese sulfate solution with a concentration of 0.05 mol / L, and after immersion for 30 min, a potassium permanganate solution with a concentration of 0.05 mol / L is added dropwise under stirring, The total dropwise amount of potassi...

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Abstract

The invention discloses a manganese oxide-loaded molecular sieve composite material preparation method, which comprises: S1, carrying out acidification heat treatment on a molecular sieve, drying, soaking the dried molecular sieve in a hydrogen peroxide solution, taking out, placing in a N2 and H2 mixed gas at a temperature of 600-800 DEG C, reacting for a preset time, and taking out; s2, putting the molecular sieve obtained in the step S1 into a divalent manganese solution, dipping, adding a potassium permanganate solution, and stirring for reaction; and S3, washing and drying the molecular sieve obtained in the step S2 to obtain a finished product. In the step S2, the mass concentration of the molecular sieve in the divalent manganese solution is 0.1-1g / L; the ratio of the addition amount of the divalent manganese solution to the addition amount of the potassium permanganate solution is (1-3): (1-3). The preparation method of the manganese oxide-loaded molecular sieve composite material provided by the invention has the advantages of cheap raw materials, wide source, simple process operation and easy industrialization.

Description

technical field [0001] The present invention relates to the technical field of molecular sieve composite materials, in particular to a preparation method and application of a molecular sieve composite material loaded with manganese oxides. Background technique [0002] At present, physical adsorption is the most common air purification technology. Activated carbon has a good adsorption effect on most air pollutants, but pure activated carbon adsorption is easy to be saturated, and it is also extremely easy to desorb with changes in humidity and temperature. , easily causing secondary pollution. Studies have shown that the transition metal oxide MnO 2 To the removal effect of formaldehyde, the supported precious metal catalyst can realize thorough catalytic oxidation to formaldehyde at room temperature, but its cost is too high so it cannot be industrialized production. ZSM-5 molecular sieve has high specific surface area, high stability and corrosion resistance. It is ofte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/48B01J37/02B01D53/86B01D53/72
CPCB01J29/48B01J37/0207B01D53/8668B01D2257/7027B01D2257/704B01D2257/708B01J2229/37B01J2229/40B01J2229/186
Inventor 赵志成邓伟李顺刘勇张双猛陈善良
Owner 佛山(华南)新材料研究院
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