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Preparation method and application of hydrogen peroxide decomposed manganese oxide catalysts

A manganese oxide and hydrogen peroxide technology, which is applied in the field of metal oxide catalyst preparation, can solve the problems of inaccurate attribute identification, great differences in the characteristics of manganese dioxide products, inconsistent effects of hydrogen peroxide, etc., and achieves low production cost. , the effect of good application and promotion value, simple and easy preparation method

Active Publication Date: 2019-09-17
SHANGHAI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, most of the hydrogen peroxide decomposition catalysts involved in practical applications are manganese dioxide, but there are many types of crystal forms of manganese dioxide. Since the identification of material properties such as crystal forms of manganese dioxide is not strict, the product characteristics of manganese dioxide actually used Variance is large, resulting in inconsistent effectiveness of their catalytic decomposition of hydrogen peroxide

Method used

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  • Preparation method and application of hydrogen peroxide decomposed manganese oxide catalysts
  • Preparation method and application of hydrogen peroxide decomposed manganese oxide catalysts
  • Preparation method and application of hydrogen peroxide decomposed manganese oxide catalysts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] In this example, a δ-MnO 2 The preparation method of catalyst, concrete steps are as follows:

[0048] a1. Weigh 0.5g potassium permanganate and 0.2g manganese sulfate monohydrate into 50mL of distilled water, stir fully at room temperature to fully dissolve potassium permanganate and manganese sulfate, and prepare potassium permanganate and manganese sulfate mixed solution;

[0049] a2. Move the mixed solution prepared according to step a1 to a 50mL polytetrafluoroethylene reactor, put the reactor into an oven at 140°C, react for 1 hour, and cool naturally to room temperature to obtain the reaction product;

[0050] a3. Wash the reaction product obtained in step a2 with twice distilled water for 3 to 4 times to obtain the washings; dry the washings at 60°C for 12 hours to obtain the final product δ-MnO 2 .

[0051] Experimental test analysis:

[0052] The δ-MnO prepared in this example 2 The catalyst was analyzed by X-ray diffraction and obtained as figure 1 The ...

Embodiment 2

[0054] This embodiment is basically the same as Embodiment 1, especially in that:

[0055] In this example, an α-MnO 2 The preparation method of catalyst, concrete steps are as follows:

[0056] b1. Weigh 0.5g of potassium permanganate and 0.2g of manganese sulfate monohydrate into 50mL of distilled water, stir fully at room temperature to fully dissolve potassium permanganate and manganese sulfate, and prepare a mixture containing potassium permanganate and manganese sulfate mixed solution;

[0057] b2. Transfer the mixed solution prepared according to step b1 into a 50mL polytetrafluoroethylene reactor, put the reactor into an oven at 140°C, react for 2 hours, and naturally cool to room temperature to obtain the reaction product;

[0058] b3. Wash the reaction product obtained in step b2 with double distilled water for 3 to 4 times to obtain the washings; dry the washings at 60°C for 12 hours to obtain the final product α-MnO 2 .

[0059] Experimental test analysis:

[...

Embodiment 3

[0062] This embodiment is basically the same as the previous embodiment, and the special features are:

[0063] In this example, a β-MnO 2 The preparation method of catalyst, concrete steps are as follows:

[0064] c1. Measure 40mL of 0.5mol / L manganese nitrate tetrahydrate solution and pour it into a 100mL ceramic crucible;

[0065] c2. Place the ceramic crucible filled with the manganese nitrate solution in the step c1 in a muffle furnace and bake at 400°C for 4 hours, then cool to room temperature, and grind to obtain the product brown-black β-MnO 2 .

[0066] Experimental test analysis:

[0067] The β-MnO prepared in this embodiment 2 The catalyst was analyzed by X-ray diffraction and obtained as figure 1 The results shown. It can be seen from the figure that β-MnO 2 There are obvious diffraction peaks at 2θ=28.64°, 37.41°, 42.71°, 56.81°, 59.25°, 65.12° and 72.53°, which correspond to (110), (101), (111), (211 ), (220), (002) and (301) crystal faces, which are com...

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Abstract

The invention discloses a preparation method and application of hydrogen peroxide decomposed manganese oxide catalysts. The manganese oxide catalysts are any one or mixtures of several ones from delta-MnO2, alpha-MnO2, beta-MnO2, gamma-MnO2, gamma-Mn3O4 and alpha-Mn2O3. At normal temperature and normal pressure, hydrogen peroxide is decomposed through catalysts; the concentration of hydrogen peroxide is reduced to be 1ppm or below. The preparation method of the manganese oxide catalysts provided by the invention has the advantages that the method is simple and convenient; the implementation is easy; the pollution is low; the control is easy; the requirements on equipment are low; the controllable degree is high; the raw material sources are wide; the production cost is low. Meanwhile, compared with the catalyst prepared in the prior art, the prepared catalyst has high hydrogen peroxide decomposing capability, so that better practical application and promotion values are realized.

Description

technical field [0001] The invention relates to a preparation method and application of a metal oxide catalyst, in particular to a preparation method and application of a manganese oxide catalyst decomposed by hydrogen peroxide, which is applied to remove peroxidation in environmental media such as water and air. field of hydrogen technology. Background technique [0002] Hydrogen peroxide (H 2 o 2 ) is a chemical widely used in industry, medical and pharmaceutical industries. It has strong oxidizing properties and can chemically oxidize many substances. In addition, in the presence of an appropriate activator, hydrogen peroxide can be decomposed to generate highly active OH free radicals, which will show stronger oxidative properties. In industries such as industry, medical treatment and pharmaceuticals, hydrogen peroxide is used as a sterilizing agent because it can inhibit or even kill pathogenic microorganisms. In recent years, vaporized hydrogen peroxide has been wi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G45/02B01J23/34B01J37/10B01D53/86B01D53/46C02F1/00
CPCC01G45/02B01J23/34B01J37/10B01D53/8671C02F1/00B01D2258/06C02F2101/10C01P2002/72C01P2002/85
Inventor 胡龙兴吴文蕾徐文超郁葵
Owner SHANGHAI UNIV
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