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Preparation method of layered cobalt manganese double-metal oxide as well as product thereof

A double metal oxide, cobalt manganese technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, catalyst activation/preparation, etc., can solve the problem of irregular morphology of cobalt manganese oxide, catalytic Problems such as low activity and uneven size, to achieve the effects of excellent physical and chemical properties, large specific surface area, and uniform precipitation

Inactive Publication Date: 2018-08-10
HUAZHONG UNIV OF SCI & TECH +1
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  • Abstract
  • Description
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Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a method for preparing a layered cobalt-manganese double metal oxide and its products. Through the hydrothermal oxidation-reduction precipitation method, the purpose is to simultaneously precipitate cobalt and manganese. This solves the technical problems of irregular shape, non-uniform size, non-uniform height and low catalytic activity of cobalt manganese oxide

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  • Preparation method of layered cobalt manganese double-metal oxide as well as product thereof
  • Preparation method of layered cobalt manganese double-metal oxide as well as product thereof
  • Preparation method of layered cobalt manganese double-metal oxide as well as product thereof

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preparation example Construction

[0030] figure 1 It is a flow chart of the preparation method of the layered cobalt-manganese double metal oxide constructed according to the preferred embodiment of the present invention, such as figure 1Shown, a kind of preparation method of layered cobalt-manganese double metal oxide, comprises the following steps: prepare the precursor aqueous solution A+B of cobalt A and manganese B and mix uniformly; Mix a certain amount of potassium permanganate with alkali, prepare It is an aqueous potassium permanganate solution C with a pH value of 8.5-8.7; under the condition of 20-80°C, add the above-mentioned A+B solution dropwise into the C solution and stir vigorously for 2-4 hours, so that the C solution turns brown-black Precipitate, stop stirring and leave it to age for 2-10 hours, transfer the precipitate to the reactor for hydrothermal reaction, the hydrothermal reaction temperature is 100-160°C, and the hydrothermal reaction time is 12-48 hours. After the reaction, the obta...

Embodiment 1

[0041] Measure 20 ml of deionized water into a beaker, then add 0.03 mol of cobalt nitrate and stir until completely dissolved. Measure 200 ml of deionized water into a blue-capped bottle, add 0.01 mol of potassium permanganate and stir until completely dissolved, adjust the pH of the reaction solution to 8.5 with NaOH, and place the blue-capped bottle in an 80-degree water bath. Afterwards, the cobalt nitrate aqueous solution was added dropwise to the potassium permanganate solution at a rate of 3 ml / min. After the dropwise addition, the solution was stirred at constant temperature for 2 hours, and the stirring was turned off for aging for 2 hours. The resulting precipitate was transferred to a polytetrafluoroethylene-lined stainless steel hydrothermal kettle and reacted at 100°C for 24 hours. After the reaction, a brown-black precipitate was obtained. After the precipitate was suction filtered, washed and dried, the atomic ratio of cobalt to manganese was 3:1, and the specif...

Embodiment 2

[0044] Measure 10 ml of deionized water into a beaker, then add 0.01 mole of cobalt nitrate and stir until completely dissolved. Measure 200 ml of deionized water into a blue-capped bottle, add 0.01 mol of potassium permanganate and stir until completely dissolved, adjust the pH of the reaction solution to 8.6 with NaOH, and place the blue-capped bottle in a 60-degree water bath. Afterwards, the cobalt nitrate aqueous solution was added dropwise to the potassium permanganate solution at a rate of 7 ml / min. After the dropwise addition was completed, the solution was stirred at a constant temperature for 3 hours, and the stirring was turned off for aging for 6 hours. The resulting precipitate was transferred to a polytetrafluoroethylene-lined stainless steel hydrothermal kettle and reacted at 120°C for 12 hours. After the reaction, a brown-black precipitate was obtained. After the precipitate was suction filtered, washed and dried, the atomic ratio of cobalt to manganese was 1:1...

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Abstract

The invention belongs to the technical field of preparation of cobalt manganese oxide and discloses a preparation method of layered cobalt manganese double-metal oxide as well as a product thereof. The preparation method comprises the following steps: (a) mixing water-soluble cobalt salt containing divalent cobalt and water-soluble manganese salt containing divalent manganese uniformly to form a precursor aqueous solution, adding the precursor aqueous solution into an alkaline aqueous solution of potassium permanganate or sodium permanganate, and mixing, stirring and reacting to generate precipitate; and (b) filtering out the precipitate, performing hydrothermal reaction, performing suction filtration and washing on the product after reaction, removing the residual solvent and drying to obtain the needed layered cobalt manganese double-metal oxide. By the preparation method, the obtained layered cobalt manganese double-metal oxide has uniform shape, enables cobalt and manganese elements to be precipitated uniformly and highly, has large specific surface area and has excellent methylbenzene catalytic combustion cavity; furthermore, the preparation method is simple, simple in requirement on equipment, low in raw material price, low in preparation energy consumption, high in repeatability and suitable for popularization and application.

Description

technical field [0001] The invention belongs to the technical field of preparation of cobalt-manganese oxides, and more specifically relates to a method for preparing layered cobalt-manganese double metal oxides and products thereof. Background technique [0002] At present, commonly used gas purification technologies include catalytic oxidation technology, photocatalytic technology, adsorption purification technology, etc. However, the above-mentioned technologies cannot achieve the desired effect due to various defects. For example, benzene series can only achieve low-temperature catalytic combustion on several noble metal catalysts, and the amount of noble metal is large, so the cost is high. Photocatalytic technology is an advanced oxidation technology used at normal temperature and pressure. Usually, TiO2 nano-powder or thin film is used as photocatalyst, and ultraviolet lamp is used as light source to remove pollutants by photocatalytic oxidation. However, since the c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/889B01J35/02B01J35/10B01J37/03B01J37/12B01J37/16C01G45/02C01G51/04F23G7/07B01J35/00
CPCF23G7/07C01G45/02C01G51/04B01J23/002B01J23/8892B01J37/031B01J37/12B01J37/16C01P2004/20C01P2006/12C01P2004/60C01P2004/82B01J35/40B01J35/613B01J35/615
Inventor 王钰李晓辉黄益群郭利民
Owner HUAZHONG UNIV OF SCI & TECH
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