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A kind of high catalytic activity mullite material, its preparation method and application

A technology with high catalytic activity and mullite, which is applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc. Low performance, complex process and other problems, to achieve the effect of simple and easy treatment method, reduced preparation cost, and low preparation cost

Active Publication Date: 2022-07-12
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the above technical solutions, it is necessary to additionally modify the mullite material or add additives to co-sinter to realize the preparation of mullite material at low temperature. The catalytic performance of the material is low, which cannot meet the application requirements of large-scale ozone degradation of organic pollutants at low cost.

Method used

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  • A kind of high catalytic activity mullite material, its preparation method and application
  • A kind of high catalytic activity mullite material, its preparation method and application
  • A kind of high catalytic activity mullite material, its preparation method and application

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preparation example Construction

[0046] see figure 1 , the embodiment of the present invention provides a kind of preparation method of mullite material, comprising:

[0047] providing kaolin; calcining the kaolin to obtain metakaolinite; uniformly mixing the metakaolinite with an alkaline substance, a complexing agent and an alkaline washing solvent to form a uniform alkaline washing system, so that the The metakaolinite is subjected to alkali washing treatment; the product obtained by the alkali washing treatment is subjected to post-treatment to obtain mullite material.

[0048] Among them, the post-processing is, for example, cleaning and drying. The cleaning can be cleaned with deionized water, distilled water, or ordinary tap water. It can be cleaned once or multiple times. Further, cleaning can be cleaned. Until the pH of the eluate is close to 10; drying can be natural drying, drying in an oven, or drying under infrared light irradiation.

[0049]In some embodiments, the calcination treatment includ...

Embodiment 1

[0077] (1) calcining 20 g of kaolin at 800° C. for 3 hours, and its heating rate is 10° C. / min, to obtain metakaolinite;

[0078] (2) the 20g metakaolinite generated by calcination is ground for use;

[0079] (3) The metakaolinite obtained in step (2) was put into 100 mL of deionized water, and 12.85 g of sodium hydroxide and 400 mg of ethylenediaminetetraacetic acid were sequentially added to the solution. The prepared solution was stirred at 60°C for 2 hours, followed by a further 3 hours at 90°C. Afterwards, the product after the alkali washing reaction was washed with deionized water until the solution pH≈10, and then the solid product was separated by centrifugation and dried in an oven at 60 °C for 12 h. Get Mullite Material-1.

[0080] image 3 is the XRD test result of the mullite material-1 prepared in Example 1 of the present invention, wherein PDF#79-1456 is the standard PDF card information of mullite; from image 3 It can be seen that although the mullite prep...

Embodiment 2

[0082] (1) calcining 20g of kaolin at 300°C for 3 hours, and its heating rate is 10°C / min, to obtain metakaolinite;

[0083] (2) the 20g metakaolinite generated by calcination is ground for use;

[0084] (3) The metakaolinite obtained in step (2) was put into 100 mL of deionized water, and 12.85 g of sodium hydroxide and 400 mg of ethylenediaminetetraacetic acid were sequentially added to the solution. The prepared solution was stirred at 60°C for 2 hours, followed by a further 3 hours at 90°C. Afterwards, the product after the alkali washing reaction was washed with deionized water until the solution pH≈10, and then the solid product was separated by centrifugation and dried in an oven at 60 °C for 12 h. Get Mullite Material-2.

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Abstract

The invention discloses a high catalytic activity mullite material, a preparation method and application thereof. The preparation method includes: calcining kaolin to obtain metakaolinite; uniformly mixing metakaolinite with an alkaline substance, a complexing agent and an alkaline washing solvent to form a uniform alkaline washing system, thereby treating the metakaolinite. The kaolinite is subjected to alkaline washing treatment; the product obtained by the alkaline washing treatment is subjected to post-treatment to obtain mullite material. Compared with other mullite materials, the mullite material provided by the invention has higher catalytic efficiency, especially for the catalytic oxidation of organic pollutants by ozone, and has low preparation cost and large output, which is beneficial to low-cost large-scale production Ozone degrades organic pollutants; moreover, raw materials are readily available and easy to operate, and mullite materials can be prepared at lower temperature, saving energy; the treatment method for ozone degrading pollutants provided by the invention is simple and easy to operate, and has high catalytic efficiency , which can realize the degradation of pollutants with low cost and high efficiency.

Description

technical field [0001] The invention relates to the technical field of ceramic material preparation, in particular to a high catalytic activity mullite material, a preparation method and application thereof. Background technique [0002] Among many sewage treatment methods, advanced oxidation technology has become the most popular sewage treatment method due to its high degradation efficiency and wide application range. The ozone method has been partially used in factory sewage treatment, and combined with the catalytic effect of catalysts, the treatment efficiency and scope of application of the method can be greatly enhanced while maintaining the low cost of ozone. However, the current common catalytic ozonation catalysts all require precious metals as active sites, which greatly increases their cost and hinders the further promotion of catalytic ozonation methods. Therefore, a low-cost catalyst with high catalytic performance has become a current research focus. As the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J21/16C02F1/78C02F101/34C02F101/36C02F101/38
CPCY02A50/20
Inventor 陆之毅苏琳峰陈徐
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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