Cryptomelane-type manganese dioxide and preparation method and use thereof

A technology of manganese dioxide and cryptopotassium, which is applied in chemical instruments and methods, catalyst activation/preparation, separation methods, etc., can solve the problems of low yield of manganese dioxide, waste of materials, energy consumption, and inability to recover, and achieve excellent Catalytic performance, easy operation, low cost effect

Active Publication Date: 2018-10-23
中科鸿景(宁波)环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the hydrothermal method requires a higher temperature, the temperature must be greater than 100°C, and the heating and reflux method requires a higher temperature, the temperature is greater than 100°C, and the time is long, and the time is greater than 24h
And the yield of manganese dioxide obtained by the above method is relatively low, about 50%, and many crystallized particles are suspended in the solvent and cannot be recovered
The waste of materials and the increase of energy consumption

Method used

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  • Cryptomelane-type manganese dioxide and preparation method and use thereof
  • Cryptomelane-type manganese dioxide and preparation method and use thereof
  • Cryptomelane-type manganese dioxide and preparation method and use thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0063] A preparation method of cryptopotassium manganese dioxide, comprising the steps of:

[0064] (1) Add 0.3 mol of potassium permanganate to 273 mL of deionized water at a temperature of 20° C. to obtain a mixture;

[0065] (2) Add 63 g of excess urea to the mixture, put it into a water bath device and raise the temperature to 90° C., and continue to stir and react for 18 hours to obtain a reaction product;

[0066] (3) The reaction product was suction filtered, washed, and dried at 100° C. for 12 hours to obtain a dried product;

[0067] (4) Calcining the dried product in an air atmosphere at a temperature of 500° C. for 3 hours to obtain the cryptopermanganite-type manganese dioxide. It is compressed into tablets and sieved into 40-60 mesh for evaluation and standby.

[0068] According to calculation, the final yield of the cryptopotassium manganese dioxide is 99%, all materials are successfully intercepted through the precipitation reaction, there is no loss of materi...

Embodiment 2

[0070] A preparation method of cryptopotassium manganese dioxide, except that the temperature of the water bath is 70° C., other conditions are the same as in Example 1. The obtained cryptopotassium manganese ore-type manganese dioxide pellets were sieved into 40-60 meshes for evaluation.

[0071] According to calculations, the final yield of the cryptopotassium manganese dioxide is 90%, all the materials are successfully intercepted through the precipitation reaction, there is no loss of materials, and the bulk density is 0.6g / mL.

Embodiment 3

[0073] A preparation method of cryptopotassium manganese dioxide, except that the temperature of the water bath is 80°C, other conditions are the same as those in Example 1. The obtained cryptopotassium manganese ore-type manganese dioxide pellets were sieved into 40-60 meshes for evaluation.

[0074] According to calculations, the final yield of the cryptopotassium manganese dioxide is 92%, all the materials are successfully intercepted through the precipitation reaction, there is no loss of materials, and the bulk density is 0.75g / mL.

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Abstract

The invention provides cryptomelane-type manganese dioxide and a preparation method and use thereof. The preparation method comprises mixing potassium permanganate and a solvent, mixing the mixture and urea for a reaction to obtain precipitates, and roasting the precipitates to obtain cryptomelane-type manganese dioxide. The use amount of potassium permanganate is greater than the solubility of potassium permanganate in a solvent. The preparation method has simple processes and utilizes easily available raw materials. The cryptomelane-type manganese dioxide has high crystallinity, high yield and high density, can catalyze combustion of volatile organic compounds such as ethyl acetate, benzene and methylene chloride at a high temperature of 200 to 500 DEG C, can decompose ozone at the roomtemperature and high humidity and has good application prospects and wide environmental protection purposes.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and relates to cryptopotassium manganese dioxide, its preparation method and application. Background technique [0002] As the intensity of human industrial activities increases, a large amount of volatile organic compounds (Volatile Organic Compounds, VOCs) are discharged into the atmosphere, causing environmental pollution through a series of chemical reactions. For example, some highly active VOCs can react photochemically with nitrogen oxides (NOx), another atmospheric pollutant, causing the concentration of surface ozone to rise and form photochemical smog pollution; some VOCs with low vapor pressure can also nucleate and grow through complex processes Secondary organic aerosols are formed, and secondary organic aerosols are an important part of fine particulate matter PM2.5. It can be seen that VOCs are important precursors for the formation of photochemical pollution and atmospheric haz...

Claims

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Application Information

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IPC IPC(8): B01J23/34B01J37/03B01J37/08B01D53/76B01D53/86B01D53/72B01D53/66B01D53/70
CPCB01D53/76B01D53/86B01D53/8662B01D53/8668B01D53/8675B01J23/34B01J37/031B01J37/082B01J35/31Y02A50/20
Inventor 贺泓邓华康顺宇单文坡连志华李要彬张燕
Owner 中科鸿景(宁波)环保科技有限公司
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