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Prepn process of amorphous manganese dioxide

A manganese dioxide, amorphous technology, applied in manganese oxide/manganese hydroxide and other directions, can solve the problems of large specific capacity and no theoretical specific capacity, and achieve the effect of simple preparation process, easy mass production and broad application prospects.

Inactive Publication Date: 2007-01-17
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] However, the above methods are either under high temperature conditions or under aqueous conditions to synthesize manganese dioxide of a certain crystal form. Because amorphous manganese dioxide has its own unique advantages, such as in the field of power supplies, amorphous MnO 2 and other manganese oxides (such as spinel LiMn 2 o 4 ) compared with: (1) no limit of theoretical specific capacity, relatively large specific capacity

Method used

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  • Prepn process of amorphous manganese dioxide
  • Prepn process of amorphous manganese dioxide

Examples

Experimental program
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Effect test

Embodiment 1

[0027] (1) Preparation of manganese salicylate

[0028] Weigh 5.75g of manganese carbonate and 13.80g of salicylic acid and place them in a 500ml beaker, add 50ml of deionized water to the beaker, stir with a magnetic stirrer, and continue stirring for 2 hours until the system has no bubbles, then move the beaker to a vacuum In an oven, dry at a constant temperature of 110°C for 72 hours to obtain solid manganese salicylate.

[0029] (2) Preparation of amorphous manganese dioxide

[0030] Weigh 4.9989g of manganese salicylate, add it into a three-necked flask equipped with 100ml of absolute ethanol and 50ml of ethylene glycol, stir in a constant temperature water bath at 65°C until dissolved, then add 2.7840g of finely ground potassium permanganate powder, and The system was heated to boiling, refluxed and stirred for 30 hours, then filtered and washed to obtain amorphous MnO 2 . Such as figure 1 , 2 As shown, the prepared MnO 2 It presents a good amorphous structure and...

Embodiment 2

[0032] (1) preparation of manganese salicylate: with embodiment 1

[0033] (2) Amorphous MnO 2 preparation of

[0034] Weigh 3.2876g of manganese salicylate, add it into a three-necked flask with 150ml of absolute ethanol, stir in a constant temperature water bath at 65°C until dissolved, add 2.5046g of finely ground ammonium persulfate powder, heat the system to boiling, and reflux After stirring for 24 hours, the amorphous MnO was obtained by filtering, washing and drying 2 . The prepared MnO 2 It presents a good amorphous structure and no X-ray characteristic diffraction peaks; the particles are tiny, with a diameter of about 100nm, uniform in size, and highly dispersed.

Embodiment 3

[0036] (1) preparation of manganese salicylate: with embodiment 1

[0037] (2) Amorphous MnO 2 preparation of

[0038] Weigh 5.0519g of manganese salicylate, add it into a three-neck flask containing 200ml of methyl ethyl ketone, stir in a constant temperature water bath at 60°C until dissolved, add 1.6843g of finely ground sodium permanganate powder, heat the system to boiling, and reflux After stirring for 48 hours, the amorphous MnO was obtained by filtering, washing and drying 2 . The prepared MnO 2 It presents a good amorphous structure and no X-ray characteristic diffraction peaks; the particles are tiny, with a diameter of about 100nm, uniform in size, and highly dispersed.

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Abstract

The present invention relates to the preparation process of amorphous manganese dioxide. Organic manganese carboxylate is dissolved in organic solvent to form homogeneous solution and oxidant is added to form mixture system, and the mixture system is thermostatically or azeotropically refluxed, filtered and washed to obtain amorphous manganese dioxide. The reaction system consists of organic manganese carboxylate in 2-5 weight portions, organic solvent in 40-80 weight portions and oxidant in 1-3 weight portions.

Description

technical field [0001] The invention relates to the field of preparation of inorganic materials, in particular to an amorphous manganese dioxide (MnO 2 ) preparation method. technical background [0002] Manganese dioxide is used in the electronics industry to make magnetic materials, in the chemical industry to make glass, ceramics and dyes or as an oxidant, in the battery industry is widely used as a cathode material, in other industries (such as: catalysts, molecular sieves , fine chemicals, environmental protection, etc.) also has a wide range of applications. Therefore, the research on chemical manganese dioxide preparation and its properties has aroused great interest, and many researchers have chemically synthesized various crystal forms of manganese dioxide, such as α, β, γ and δ crystal forms of manganese dioxide. [0003] The methods of chemically synthesizing manganese dioxide usually include: thermal decomposition method, liquid phase oxidation method, reducti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G45/02
Inventor 袁中直朱立才
Owner SOUTH CHINA NORMAL UNIVERSITY