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Method for preparing trichlorosilane catalyst through hydrogenation dechlorination of silicon tetrachloride

A technology for hydrodechlorination and trichlorosilane, applied in the field of silicon purification, can solve the problems of high cost, complex catalyst preparation process, etc., and achieve the effects of solving storage, reducing pollution control equipment and operating costs, and high activity

Inactive Publication Date: 2016-05-04
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the problems existing in the above-mentioned prior art, and provides a method for preparing a catalyst for trichlorosilane by hydrodechlorination of silicon tetrachloride, which solves the complicated preparation process of the catalyst for trichlorosilane in the prior art, high cost problem

Method used

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  • Method for preparing trichlorosilane catalyst through hydrogenation dechlorination of silicon tetrachloride
  • Method for preparing trichlorosilane catalyst through hydrogenation dechlorination of silicon tetrachloride

Examples

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Embodiment 1

[0022] (1) Amorphous silicon aluminum after roasting, the specific surface area is 150m 2 / g, pore volume 0.7mL / g, silicon oxide content 5wt%, particle size 125μm, mixed with cuprous chloride, the mixing mass ratio is cuprous chloride:amorphous silicon aluminum=2.8:1.

[0023] (2) Under the protection of an inert gas, the above mixture was heated with a heating rate of 50°C / h, a calcination temperature of 450°C, and a constant temperature time of 30 minutes. After the constant temperature was completed, the temperature was naturally lowered to obtain a finished catalyst.

Embodiment 2

[0025] Others are the same as Example 1, the difference is that in step (2), the temperature during the roasting is 600 degrees centigrade, and the constant temperature is 30min.

Embodiment 3

[0027] (1) Amorphous silicon aluminum after roasting, the specific surface area is 500m 2 / g, pore volume 1.0mL / g, silicon oxide content 50wt%, particle size 200μm, mixed with cuprous chloride, the mixing mass ratio is cuprous chloride:amorphous silicon aluminum=4.0:1.

[0028] (2) Under the protection of an inert gas, the above mixture was heated with a heating rate of 100°C / h, a calcination temperature of 600°C, and a constant temperature time of 60 minutes. After the constant temperature was completed, the temperature was naturally lowered to obtain a finished catalyst.

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Abstract

The invention relates to a method for preparing a trichlorosilane catalyst through hydrogenation dechlorination of silicon tetrachloride; cuprous chloride is used as an active component, and amorphous silicon aluminum is used as a catalyst carrier. An amorphous silicon aluminum powder after calcination is mixed with a certain amount of cuprous chloride, the mixture is treated at high temperature and in an inert atmosphere, and the product is cooled to obtain the finished product catalyst. The method has the advantages of simple preparation process, and no wastewater, waste gas and waste residue pollution. The catalyst is evaluated to indicate that under process conditions of the reaction temperature of 450 DEG C, the pressure of 1.2 MPa, the H2 / SiCl4 molar ratio of 25 and the airspeed of 1000 h<-1>, the conversion rate can reach more than or equal to 30%, and the requirement of industrialized production can be met.

Description

technical field [0001] The invention relates to the field of silicon purification, in particular to a method for preparing a catalyst for hydrogenating silicon tetrachloride to prepare trichlorosilane. Background technique [0002] The depletion of fossil energy in the future has always plagued the energy industry of countries all over the world. Alternative energy, especially non-polluting and low-cost alternative energy, is the direction of active development of various countries. As a renewable energy source, solar energy has attracted the attention of various countries, and polysilicon as the main raw material of solar cells and its preparation process improvement should become a research hotspot. [0003] At present, the domestic improved Siemens method occupies the mainstream of polysilicon production. The operating conditions of this method are relatively low, but every ton of polysilicon produced will produce more than 10 tons of silicon tetrachloride by-product. In ...

Claims

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Application Information

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IPC IPC(8): B01J23/72C01B33/107
CPCB01J23/72B01J23/002B01J2523/00C01B33/1071B01J2523/17B01J2523/31B01J2523/41
Inventor 毛微马诚梁飞雪高博
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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