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Hydrogenation catalyst and preparation method thereof

A hydrogenation catalyst, catalyst technology, applied in physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problem of inability to reduce costs, poor catalytic effect of elemental copper, The problem of high cost of nickel-based catalysts can achieve the effects of high production efficiency, stable conversion process and short production cycle.

Active Publication Date: 2012-02-15
LUOHE HUATONG METALLURGICAL POWDER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The production efficiency of this method is low, and the price of nickel remains high, resulting in generally high cost of nickel-based catalysts
In addition, there are copper catalysts prepared by chemically depositing copper elements on the silica skeleton, but the catalytic effect of elemental copper is poor, and the conversion rate of silicon tetrachloride is generally lower than 18%, which still cannot be achieved in actual production. to reduce costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] According to the total mass of 100kg, the proportion is 99% electrolytic copper and 1% metal silicon. After the copper is melted at 1200°C with an intermediate frequency furnace, metal silicon is added. After melting, atomize with high-pressure water at a pressure of 30MPa. Under the protection of hydrogen in the reduction furnace, the powder is dried and reduced at 800°C, and the powder is passed through a 10-400 mesh sieve to obtain a finished catalyst.

Embodiment 2

[0027] According to the total mass of 100kg, the proportion is 79.7% electrolytic copper, 20% electrolytic nickel and 0.3% metal silicon. Melt copper and nickel in an intermediate frequency furnace at 1600°C, and then add metal silicon. After melting, atomize with high-pressure water at a pressure of 50MPa. Under the protection of hydrogen in the reduction furnace, the powder is dried and reduced at 700°C, and the powder is passed through a 10-400 mesh sieve to obtain a finished catalyst.

Embodiment 3

[0029] According to the total mass of 100kg, the proportion is 87% electrolytic copper, 10% metal silicon, and 3% rare earth lanthanum. After the copper is melted at 1200°C in an intermediate frequency furnace, metal silicon and rare earth lanthanum are added in sequence. After melting, atomize with 18MPa high-pressure water. Under the protection of hydrogen in the reduction furnace, the particles are dried and reduced at 800°C, and the particles are passed through a 10-400 mesh sieve to obtain a finished catalyst.

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Abstract

The invention discloses a hydrogenation catalyst and a preparation method thereof. The catalyst is applied to a hydrogenation reaction for transforming trichlorosilane by using silicon tetrachloride. The catalyst takes copper-silicon alloy, copper-nickel-silicon alloy, copper-silicon-rare-earth alloy or copper-nickel-silicon-rare-earth alloy as an active ingredient and is powdered or grain-shaped. The preparation method of the catalyst comprises the main process steps of: smelting, atomizing, reducing and drying, and sieving to obtain a finished catalyst. The catalyst has the advantages of high transformation rate, good heat-resistant stability, high product purity and the like; and compared with a chemical method, no waste gas and waste acid are discharged in the production process, the production cycle is short and the production efficiency is high.

Description

technical field [0001] The invention relates to a hydrogenation catalyst and a preparation method thereof. The catalyst is used in the hydrogenation reaction of converting silicon tetrachloride into trichlorosilane. Background technique [0002] At present, the production method of domestic polysilicon is mainly the improved Siemens method. While applying this method to produce polysilicon, a large amount of by-product silicon tetrachloride will be produced. Since silicon tetrachloride is highly corrosive and seriously pollutes the environment, silicon tetrachloride must be recycled. The conversion of silicon tetrachloride into trichlorosilane, the production raw material of polysilicon, realizes the circular production of polysilicon enterprises, and reduces the production cost of enterprises while dealing with environmental pollution. [0003] At present, most polysilicon enterprises use the cold hydrogenation process to convert silicon tetrachloride into trichlorosilane...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/72B01J23/755B01J23/83C01B33/107
Inventor 郭屹宾郭德林
Owner LUOHE HUATONG METALLURGICAL POWDER
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