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Cobaltosic oxide powder and preparation method thereof

A technology of cobalt tetroxide powder and cobalt tetroxide, which is applied in chemical instruments and methods, nitrous oxide capture, cobalt oxide/cobalt hydroxide and other directions, can solve the problems of few researches on catalytic oxidation at room temperature, and achieve easy popularization and application, cheap and easy raw materials. obtainable, low-cost effect

Inactive Publication Date: 2014-05-28
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The catalytic oxidation of NO at room temperature is mainly activated carbon, zeolite and transition metal oxides, but the above-mentioned materials are mainly for high concentration of NO (higher than hundreds of ppm), and for the adsorption of several ppm of NO and catalytic oxidation at room temperature little research

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  • Cobaltosic oxide powder and preparation method thereof
  • Cobaltosic oxide powder and preparation method thereof
  • Cobaltosic oxide powder and preparation method thereof

Examples

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Embodiment 1

[0042] Described in accordance with the technical scheme and process flow. Dissolve 1.245g of cobalt acetate in 50mL of water, then add 1mL of ethanolamine dropwise to the above solution to obtain a blue precipitate α-Co(OH) 2 , the mixture was placed in an ultrasonic reactor with circulating cooling water, the ultrasonic power was 150W, the ultrasonic frequency was 53KHz, the water temperature was maintained at 25°C, and the reaction was carried out for 2h. The cobalt hydroxide prepared above was sucked and dried in an oven at 80°C. The dried cobalt hydroxide was sintered at 200° C. for 1 h. The XRD diffraction pattern of the prepared tricobalt tetroxide is as follows figure 1 As shown, cobalt tetroxide can be obtained by sintering at 200 °C. Its surface morphology is as Figure 2b and Figure 2e As shown, it can be seen that its surface morphology is flake or flower shape. The specific surface area of ​​the prepared cobalt tetroxide is shown in Table 1. At the sinterin...

Embodiment 2

[0044] Repeat Example 1, but the sintering temperature is 150°C, and its surface morphology is as Figure 2a and Figure 2d As shown, it can be seen that its surface morphology is flake or flower shape. The specific surface area of ​​the prepared cobalt tetroxide is shown in Table 1. At the sintering temperature of 150°C, the BET specific surface area is as high as 140m 2 g -1 .

Embodiment 3

[0046] Repeat Example 1, but the sintering temperature is 250 ° C, and its surface morphology is as Figure 2c and Figure 2f As shown, it can be seen that its surface morphology is flake or flower shape. The specific surface area of ​​the prepared cobalt tetroxide is shown in Table 1. At the sintering temperature of 250°C, the BET specific surface area is as high as 134m 2 g -1 .

[0047] Table 1. Specific surface area parameters of cobalt tetroxide obtained at different sintering temperatures.

[0048]

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Abstract

The invention relates to a cobaltosic oxide powder and a preparation method thereof. The preparation method comprises the following steps: (1) dropwise adding ethanolamine into a cobaltous acetate water solution to form a mixed solution, wherein the molar ratio of the cobaltous acetate to ethanolamine is (1:3)-(1:6); (2) performing reaction on the obtained mixed solution under an ultrasonic condition with the ultrasonic power of 350-500 w and the ultrasonic frequency of 50-100 kHz at the temperature of 20-30 DEG C for 1-10 hours, filtering and drying to obtain cobalt hydroxide; (3) calcining the obtained cobalt hydroxide for 1-2 hours at the temperature of 150-250 DEG C to obtain the cobaltosic oxide powder. By performing ultrasonic synthesis on the cobalt hydroxide, the cobalt hydroxide and the thermal decomposition product cobaltosic oxide of the cobalt hydroxide have relatively high specific surface areas, and a plurality of gaps and active sites can be formed on the surface of the cobaltosic oxide powder, so that an excellent catalytic oxidation effect on low-concentration NO is realized.

Description

technical field [0001] The invention relates to tricobalt tetroxide with high specific surface area, its preparation method and its application in removing low-concentration nitric oxide at room temperature, and belongs to the technical field of catalytic materials. Background technique [0002] Cobalt tetroxide is one of the most widely used transition metal oxides and has been widely used in lithium-ion batteries, supercapacitors, catalysts, and gas sensors. There are many synthesis methods of cobalt tetroxide, including thermal decomposition method, hydrothermal method, combustion method, sol-gel method, inverse microemulsion method and microwave method and so on. The synthesized cobalt tetroxide has a variety of shapes, such as tube, rod, wire, cube, flake, flower and so on. The morphology, specific surface area, pore size and particle size distribution of cobalt tetraoxide will have a significant impact on its application. At present, there have been many reports on f...

Claims

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Application Information

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IPC IPC(8): C01G51/04B01J23/75B01J35/10B01D53/86B01D53/56
CPCY02C20/10Y02P20/151
Inventor 杜燕燕施剑林黄为民王进
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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