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Preparation method of sheet spinel structure cobalt-manganese composite oxide

A spinel structure and composite oxide technology, which is applied in chemical instruments and methods, catalyst activation/preparation, combustion methods, etc., can solve the problems of undiscovered cobalt-manganese composite oxides with sheet shape, increased cost, and difficult large-scale Production and other issues, to achieve the effect of no washing, good reaction performance, and low cost

Inactive Publication Date: 2017-05-24
SHANGHAI JIAO TONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Microwave heating also needs to be carried out at a higher temperature, so the above method will inevitably increase the cost, and it is difficult to achieve large-scale production
[0005] There have been reports on the synthesis of cobalt-manganese composite oxides with rod-like and flower-like morphology structures, but no relevant reports have been found on cobalt-manganese composite oxides with sheet-like morphology

Method used

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  • Preparation method of sheet spinel structure cobalt-manganese composite oxide
  • Preparation method of sheet spinel structure cobalt-manganese composite oxide
  • Preparation method of sheet spinel structure cobalt-manganese composite oxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Weigh 4.656g cobalt nitrate hexahydrate and 2.860g manganese nitrate solution (mass fraction is 50%) and place in a 500mL beaker, add 200mL absolute ethanol, stir and dissolve to obtain solution A; weigh 3.620g oxalic acid dihydrate and place in 100mL In the beaker, add 50mL of absolute ethanol, stir and dissolve to obtain solution B; under stirring, drop solution B into solution A drop by drop, and continue stirring for 4-6h; The final precipitate obtained was dried in a blast oven at 70-80°C for 12 hours, and then dried; the dried solid was roasted in a muffle furnace at a temperature of 300°C for 4 hours, and a heating rate of 2°C / min, to obtain flaky cobalt-manganese composite oxides.

[0033] like figure 2 As shown in the SEM results, the thickness of the sheet is 0.03 μm. figure 1 The XRD pattern result of Example 1 shows that the oxide is a spinel structure.

Embodiment 2

[0035] Weigh 4.656g cobalt nitrate hexahydrate and 2.860g manganese nitrate solution (mass fraction is 50%) and place in a 500mL beaker, add 200mL absolute ethanol, stir and dissolve to obtain solution A; weigh 3.620g oxalic acid dihydrate and place in 100mL In the beaker, add 50mL of absolute ethanol, stir and dissolve to obtain solution B; under stirring, drop solution B into solution A drop by drop, and continue stirring for 4-6h; The obtained precipitate was dried in a blast oven at 70-80°C for 12 hours, and dried; the dried solid was roasted in a muffle furnace at a temperature of 400°C for 4 hours and a heating rate of 2°C / min, to obtain flaky cobalt-manganese composite oxides.

[0036] like image 3 As shown in the SEM results, the thickness of the sheet is 0.02 μm. figure 1 The XRD result of Example 2 shows that the oxide is a spinel structure.

Embodiment 3

[0038] Weigh 4.656g cobalt nitrate hexahydrate and 2.860g manganese nitrate solution (mass fraction is 50%) and place in a 500mL beaker, add 200mL absolute ethanol, stir and dissolve to obtain solution A; weigh 3.620g oxalic acid dihydrate and place in 100mL In the beaker, add 50mL of absolute ethanol, stir and dissolve to obtain solution B; under stirring, drop solution B into solution A drop by drop, and continue stirring for 4-6h; The final precipitate obtained was dried in a blast oven at 70-80°C for 12 hours, and dried; the dried solid was roasted in a muffle furnace at a temperature of 500°C for 4 hours and a heating rate of 2°C / min, the flaky cobalt-manganese composite oxide is obtained.

[0039] like Figure 4 As shown in the SEM results, the thickness of the sheet is 0.03 μm. figure 1The XRD result of Example 3 shows that the oxide is a spinel structure.

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Abstract

The invention provides a preparation method of a sheet spinel structure cobalt-manganese composite oxide. The preparation method comprises the following steps: 1, weighing an aqueous solution of cobalt nitrate hexahydrate and manganous nitrate, dissolving in absolute ethyl alcohol, stirring and dissolving to obtain a solution A; additionally weighing excessive oxalic acid dihydrate, dissolving in the absolute ethyl alcohol, stirring and dissolving to obtain a solution B; 2, adding the solution B dropwise into the solution A while stirring, and continuing to stir to obtain a mixed solution; 3, after completing stirring, conducting suction filtration on the mixed solution, and drying a precipitate obtained through suction filtration in an air circulation oven; 4, roasting the dried solid in a muffle furnace to obtain the sheet spinel structure cobalt-manganese composite oxide. According to the preparation method, other metal cations except the necessary metal salts are not introduced, the preparation method has the advantages of cheap raw materials, simple operation, washing-free, even distribution of products, and high purity, and the obtained product shows very high activity on the complete oxidation reaction of benzene.

Description

technical field [0001] The invention relates to a preparation method of a cobalt-manganese composite oxide, which belongs to the technical field of material preparation and environmental protection, in particular to a preparation method of a flaky spinel-structured cobalt-manganese composite oxide Co2MnOx. Background technique [0002] Cobalt-manganese composite oxide is a new type of material with a wide range of uses. Because it contains two different metal ions and has a special spinel crystal structure, it is widely used in magnetism, electronics, catalysis, energy conversion and storage, etc. have great application prospects. With the promulgation of various laws and regulations for the treatment of VOCs (volatile organic compounds) in recent years, the application of cobalt-manganese composite oxides in VOCs treatment has attracted much attention. [0003] The activity of cobalt-manganese composite oxide catalysts for VOCs removal is related to its specific surface ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J35/02B01J37/03F23G7/07B01J35/00
CPCF23G7/07B01J23/8892B01J37/03B01J35/00B01J35/30
Inventor 何丹农叶俊辉袁静
Owner SHANGHAI JIAO TONG UNIV
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