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Nanometer catalyst for silicon tetrachloride hydrogenation reaction and preparation method thereof

A nano-catalyst and hydrogenation reaction technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, silicon halide compound, etc., can solve the problems of reducing the catalytic efficiency of the catalyst and being unfavorable for contact, etc., to achieve High utilization rate, good dispersion, high activity effect

Inactive Publication Date: 2012-02-15
天威四川硅业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this technical scheme, most of the active metal components are supported on the inert carrier SiO 2 In the inner hole, it is not conducive to the contact between the reactant silicon powder and the active component, which reduces the catalytic efficiency of the catalyst

Method used

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  • Nanometer catalyst for silicon tetrachloride hydrogenation reaction and preparation method thereof
  • Nanometer catalyst for silicon tetrachloride hydrogenation reaction and preparation method thereof
  • Nanometer catalyst for silicon tetrachloride hydrogenation reaction and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Dissolve 1g of copper chloride and 0.05g of palladium chloride in 100g of hydrochloric acid solution with a mass content of 10%, and stir evenly until all the solids are dissolved. Add 200g of silicon powder into the prepared solution, let it stand for 5 hours, dry it at 100°C for 5 hours, then bake it at 450°C in a hydrogen atmosphere for 8 hours, and store it in a nitrogen atmosphere for later use.

Embodiment 2

[0024] Dissolve 0.1g of copper chloride, 1.0g of nickel chloride, 0.05g of manganese chloride, and 0.2g of cesium chloride in 100g of hydrochloric acid solution with a mass content of 10%, and stir evenly until all the solids are dissolved. Add 200 g of silicon powder into the prepared solution, let it stand for 5 hours, dry it at 50°C for 5 hours, then bake it at 700°C in a hydrogen atmosphere for 8 hours, and store it in a nitrogen atmosphere for later use.

Embodiment 3

[0026] Dissolve 0.3g of cuprous oxide, 1.0g of nickel chloride, and 0.1g of potassium chloride in 100g of hydrochloric acid solution with a mass content of 10%, and stir evenly until all the solids are dissolved. Put it in a hydrothermal kettle, conduct a hydrothermal reaction at 200°C and 1.3Mpa to prepare nanoparticles smaller than 100nm, filter and separate, then roast at 800°C in a hydrogen atmosphere for 8 hours, and store it in a nitrogen atmosphere for later use.

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Abstract

The invention relates to the field of catalysts, and discloses a nanometer catalyst for silicon tetrachloride 'cold hydrogenation' reaction. The nanometer catalyst comprises the following components in percentage by weight: 0 to 99 percent of copper element and 0 to 99 percent of nickel element which serve as active ingredients and the balance of cocatalyst metal, wherein the components are loaded on the surface of silicon powder in a form of nanometer granules. A preparation process comprises the following steps of: dissolving the active ingredients and loading the dissolved active ingredients on the surface of the silicon powder in a form of nanometer granules by an immersion method or preparing nanometer granules from the active ingredients in a hydrothermal method, and mixing the nanometer granules and the silicon powder, so that the catalyst fully contacts the silicon powder to prepare a mixture of the catalyst and the silicon powder; and activating the mixture in advance at high temperature under the atmosphere of hydrogen, and guiding into a reactor to perform reaction. The nanometer catalyst prepared by the method is small in granules and high in utilization rate, can contact the silicon powder fully, and has the characteristics of high dispersity, high activity and the like when used for the silicon tetrachloride cold hydrogenation reaction.

Description

technical field [0001] The invention belongs to a catalyst and its preparation technology, in particular to a nanometer catalyst used in the hydrogenation reaction of silicon tetrachloride and a preparation method thereof. Background technique [0002] Polysilicon is widely used in the semiconductor and photovoltaic industries. Especially in recent years, with the energy crisis and the enhancement of people's awareness of environmental protection, it is an urgent requirement for social development to find new energy sources without pollution. Solar energy has attracted much attention because of its cleanness, safety and abundant resources. Silicon-based solar cells are now the mainstream technology for utilizing solar energy, which has greatly increased the demand for high-purity crystalline silicon. [0003] High-purity polysilicon is mainly produced through the reduction of trichlorosilane. This method was invented by Germany (Siemens) in 1954, and it is also known as th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J23/889B01J23/78B82Y40/00C01B33/107
Inventor 李小港陈少华魏屹
Owner 天威四川硅业有限责任公司