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Catalyst for preparing dichlorosilane, preparation method of catalyst and preparation method of dichlorosilane

A technology for silicon dichlorosilane and a catalyst is applied to the catalyst for preparing silicon hydrogen chloride and the field of preparation thereof, which can solve the problems of easy falling off, poor adsorption effect, low catalytic efficiency of the catalyst, etc., so as to improve the catalytic activity and increase the degree of dispersion. , the effect of reducing particle size

Inactive Publication Date: 2013-09-11
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to solve the technical problems that the metal particles of the precious metal-loaded activated carbon catalyst prepared by the existing method for preparing the catalyst for preparing dichlorosilane have poor adsorption effect on the activated carbon, are easy to fall off, and have low catalytic efficiency of the catalyst.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] 1. Pretreatment of activated carbon: Take 30g of activated carbon, wash it with deionized water several times until the water after washing is clear, dry it naturally, and bake it in a blast oven at 110°C for 8 hours to obtain activated carbon CA1-0;

[0045] 2. Soak the activated carbon in 200ml of 1.0mol / L citric acid aqueous solution for 10 hours, take it out after soaking, and bake it in a blast oven at 110°C for 8 hours to obtain activated carbon CA1-1;

[0046] 3. Impregnate cobalt salt: A. Prepare 0.1mol / L CoCl 2 ·6H 2 O solution 500ml, B, get 20g activated carbon CA1-1, get 240ml CoCl prepared above 2 ·6H 2 O solution in a 500ml beaker, put activated carbon CA1-1 into CoCl 2 ·In the 6H2O solution, let it stand for immersion for 8 hours. C. After the immersion, remove the excess immersion liquid, dry it naturally, and dry it in a blast oven at 120°C for 10 hours to obtain activated carbon CA1-2;

[0047] 4. Roasting: Calcining activated carbon CA1-2 at a temp...

Embodiment 2

[0051] 1. Pretreatment of activated carbon: Take 30g of activated carbon, wash it with deionized water several times until the water after washing is clear, dry it naturally, and bake it in a blast oven at 100°C for 8 hours to obtain activated carbon CA2-0;

[0052] 2. Soak the activated carbon in 300ml of 1.2mol / L citric acid aqueous solution for 8 hours, take it out after soaking, and bake it in a blast oven at 100°C for 8 hours to obtain activated carbon CA2-1;

[0053] 3. Impregnate cobalt salt: A. Prepare 0.9mol / L CoCl 2 ·6H 2O solution 500ml, B, get 20g activated carbon CA2-1, get 300ml CoCl prepared above 2 ·6H 2 O solution in a 500ml beaker, put activated carbon CA2-1 into CoCl 2 ·6H 2 In the O solution, stand and soak for 20 hours. C. After the soaking is completed, remove the excess soaking liquid, dry it naturally, and dry it in a blast oven at 100°C for 8 hours to obtain activated carbon CA2-2;

[0054] 4. Roasting: Calcining activated carbon CA2-2 at a temper...

Embodiment 3

[0058] 1. Pretreatment of activated carbon: take 30g of activated carbon, wash it with deionized water several times until the rinsed water is clear, dry it naturally, and bake it in a blast oven at 120°C for 5 hours to obtain activated carbon CA3-0;

[0059] 2. Soak the activated carbon in 200ml of 0.4mol / L citric acid aqueous solution for 12 hours, take it out after soaking and dry it in a blast oven at 120°C for 5 hours to obtain activated carbon CA3-1;

[0060] 3. Impregnate cobalt salt: A. Prepare 0.5mol / L CoCl 2 ·6H 2 O solution 500ml, B, get 20g activated carbon CA3-1, get 300ml CoCl prepared above 2 ·6H 2 O solution in a 500ml beaker, put activated carbon CA3-1 into CoCl 2 ·6H 2 In the O solution, stand for immersion for 36 hours. C. After the immersion, remove the excess immersion liquid, dry it naturally, and dry it in a blast oven at 120°C for 5 hours to obtain activated carbon CA3-2;

[0061] 4. Roasting: Calcining activated carbon CA3-2 at a temperature of 32...

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PUM

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Abstract

The invention provides a preparation method of a catalyst for preparing dichlorosilane. The preparation method comprises the following steps of: step one, soaking active carbon in an aqueous solution of citric acid, taking out and drying the active carbon after the soaking is completed; step two, soaking the active carbon through soaking in an aqueous solution of cobalt salt, taking out and drying the active carbon after the soaking is completed, and then performing baking; and step three, performing a reduction reaction on the active carbon through baking so as to obtain the catalyst. The invention further provides the catalyst prepared and obtained through the preparation method and a preparation method of dichlorosilane adopting the catalyst. According to the preparation methods disclosed by the invention, the catalytic activity of the catalyst can be effectively improved, so that the catalytic efficiency of the catalyst is high; and the dichlorosilane is prepared by adopting the catalyst, so that the yield of the dichlorosilane can achieve more than 12%.

Description

technical field [0001] The invention relates to the field of preparation of dichlorosilane, in particular to a catalyst for preparing dichlorosilane, a preparation method thereof and a preparation method of dichlorosilane. Background technique [0002] Dichlorosilane is generally used as a silicon source gas in semiconductor epitaxy and chemical vapor deposition processes to prepare silane. Dichlorosilane can be prepared in a variety of ways, for example: prepare dichlorosilane and silicon tetrachloride through the disproportionation of trichlorosilane, and then obtain the required dichlorosilane. The disproportionation reaction of trichlorosilane is carried out in the presence of an appropriate catalyst. [0003] In recent years, with the intensification of the energy crisis, the solar photovoltaic industry has developed rapidly worldwide, resulting in a sharp increase in the demand for polysilicon, the main raw material for solar cells, but the insufficient supply of poly...

Claims

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Application Information

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IPC IPC(8): B01J23/75C01B33/107
Inventor 陈丹丹丁显波宋兆德
Owner BYD CO LTD
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