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White carbon black core-shell structure catalyst and preparation method and application thereof

A core-shell structure, white carbon black technology, applied in catalyst activation/preparation, chemical instruments and methods, chemical elements of heterogeneous catalysts, etc. and other problems, to achieve the effect of good economic value, easy to meet preparation conditions, and guaranteed chemical properties

Inactive Publication Date: 2020-07-28
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the equipment and facilities required by the wet removal process are relatively large in volume, which will generate a lot of wastewater and some of the wastewater is difficult to treat, which will cause serious secondary pollution, and the recycling rate of active ingredients in the production process is relatively low.
Relatively speaking, the dry process can effectively make up for the defects of the wet process. The dry process mainly uses high-efficiency adsorbent catalysts to adsorb and transform impurities under non-liquid phase conditions. This method can be used in many The removal of impurity gases is completed in a small space, and the impurity substances can be converted into other resource products that can be reused relatively efficiently, which can greatly reduce the generation of secondary pollution, but there are conditions for the use of existing dry catalysts Defects such as harshness, insufficient stability of materials and high cost

Method used

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  • White carbon black core-shell structure catalyst and preparation method and application thereof
  • White carbon black core-shell structure catalyst and preparation method and application thereof
  • White carbon black core-shell structure catalyst and preparation method and application thereof

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preparation example Construction

[0038] The present invention provides the preparation method of the white carbon black core-shell structure catalyst described in the technical scheme, comprising the following steps:

[0039] Cu(NO 3 ) 2 ·3H 2 O, Ce(NO 3 ) 3 ·6H 2 O, Mg(NO 3 ) 2 ·6H 2 O is mixed with water to obtain a mixed solution of metal ions;

[0040] Mixing the metal ion mixed solution, the precipitated silica mixed solution and the surfactant to obtain a reaction mixed solution;

[0041] Add dilute sulfuric acid dropwise to the reaction mixture for co-precipitation to obtain a precipitate-supernatant mixture;

[0042] The precipitate-supernatant mixed material is separated, and the separated solid material is sequentially dried and roasted to obtain a white carbon black core-shell structure catalyst.

[0043] In the present invention, unless otherwise specified, the required preparation materials are commercially available products well known to those skilled in the art.

[0044] The present...

Embodiment 1

[0064] Prepare 70mL of sodium silicate solution (water glass) with a mass concentration of 10% in the reactor, and add dehydrated alcohol with a volume ratio of 3:10 to the sodium silicate solution, and mix evenly under the stirring condition of 300r / min. Obtain water glass-ethanol mixed solution;

[0065] Under the condition of stirring, the fixed temperature is 25°C, and dilute sulfuric acid with a mass fraction of 10% is added dropwise to the water glass-ethanol mixed solution, and after adjusting the pH value to 8.0, keep the pH value of the system and raise the temperature to 80°C Stir for 10 hours, then continue to add dilute sulfuric acid dropwise to the resulting mixture until the pH value is 4.0, stir for 1.5 hours, cool down to 25°C, wait until flocculent precipitates are formed and the flocculent precipitates no longer increase, and the precipitated white carbon black mixture is obtained ;

[0066] At a temperature of 25°C, the Cu(NO 3 ) 2 ·3H 2 O, Ce(NO 3 ) 3 ·...

Embodiment 2

[0072] Prepare 65 mL of sodium silicate solution (water glass) with a mass concentration of 13% in the reactor, and add dehydrated alcohol with a volume ratio of 3.5:10 to the sodium silicate solution, and mix evenly under a stirring condition of 300 r / min. Obtain water glass-ethanol mixed solution;

[0073] Under the condition of stirring, the fixed temperature is 25°C, and dilute sulfuric acid with a mass fraction of 10% is added dropwise to the water glass-ethanol mixed solution, and after adjusting the pH value to 8.0, keep the pH value of the system and raise the temperature to 80°C Stir for 10 hours, then continue to add dilute sulfuric acid dropwise to the resulting mixture until the pH value is 4.0, stir for 1.5 hours, cool down to 25°C, wait until flocculent precipitates are formed and the flocculent precipitates no longer increase, and the precipitated white carbon black mixture is obtained ;

[0074] At a temperature of 25°C, the Cu(NO 3 ) 2 ·3H 2 O, Ce(NO 3 ) ...

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Abstract

The invention provides a white carbon black core-shell structure catalyst and a preparation method and application thereof, and belongs to the technical field of air pollution control. According to the white carbon black core-shell structure catalyst provided by the invention, SiO2 is used as the core, and a CuO-CeO2-MgO compound is used as the shell. According to the invention, precipitated whitecarbon black and a plurality of metal salts are used as raw materials; the white carbon black particles are wrapped with oxides of copper, cerium and magnesium by using a coprecipitation method; andthe obtained core-shell structure catalyst is stable in performance, can be stably used in the atmosphere of coexistence of hydrogen sulfide, hydrogen phosphide, arsenic hydride and hydrogen cyanide,has a good effect of simultaneously removing various gases such as AsH3, HCN, H2S and PH3 in reductive industrial furnace tail gas, and has the advantages of stable structure, good adaptability, higher conversion rate and the like.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to a white carbon black core-shell structure catalyst and its preparation method and application. Background technique [0002] In the tail gas produced by reducing industrial furnaces (including yellow phosphorus chemical industry, acetylene gas manufacturing, acid industry, etc.), in addition to the main products in the industrial production process such as phosphoric acid, acetic acid, acetylene, polyvinyl chloride and other main product substances and can be used In order to recover CO with great economic value, it will also contain a large amount of impurity gases such as hydrogen sulfide (H 2 S), phosphine (PH 3 ), arsine (AsH 3 ), hydrogen cyanide (HCN), etc. Most of these residual impurity gases are highly toxic to the environment. If they are discharged directly or without complete treatment, they will seriously damage the surrounding environment and cause ...

Claims

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Application Information

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IPC IPC(8): B01J23/83B01J37/03B01J37/08B01D53/86B01D53/52B01D53/54B01D53/64B01D53/46
CPCB01J23/83B01J23/002B01J37/031B01J37/03B01J37/0018B01D53/8612B01D53/8621B01D53/8665B01D53/8671B01J2523/00B01J35/397B01J2523/17B01J2523/22B01J2523/3712B01J2523/41
Inventor 宁平陈潇李凯王飞刘娜冯嘉予
Owner KUNMING UNIV OF SCI & TECH
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