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Copper catalyst and preparation method and application thereof

A copper catalyst, catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of poor catalytic performance, reduced Al and O content, catalyst melting Problems such as blocked pipelines

Active Publication Date: 2013-04-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition to the poor catalytic performance of this kind of nickel salt and copper salt catalyst, due to the low melting point of copper, the catalyst melting often blocks the pipeline during application, which not only causes unnecessary parking loss, but also causes material loss
The aluminum chloride and water produced by the alumina carrier during the hydrogenation process are continuously brought into the follow-up system in the form of steam at 450-500 ° C, resulting in a decrease in the content of Al and O in the unloaded sample, and also The purity of the product trichlorosilane is reduced, which has an adverse effect on the purification of the product
[0008] Therefore, traditional copper-based catalysts have the following disadvantages: (1) low activity, loss of active components; (2) agglomeration of active components; (3) entering subsequent systems as impurities

Method used

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  • Copper catalyst and preparation method and application thereof
  • Copper catalyst and preparation method and application thereof
  • Copper catalyst and preparation method and application thereof

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preparation example Construction

[0017] The preparation method of the copper catalyst provided by the present invention is to heat copper, silicon, and transition metals to melt, cool the melt to solidify, and use an alkali-acid solution to extract the solidified alloy to extract part Silicon to obtain the catalyst. When the catalyst is used in the hydrogenation reaction of silicon tetrachloride, it has higher activity and selectivity than conventional catalysts, and has good stability.

[0018] More specifically, the preparation method will be a melt of an alloy composed of copper, silicon, and or not at least one transition metal selected from the group IB, IIB, IIIB, IVB, VIB, VIIB or VIII of the periodic table of elements Rapid solidification at a cooling rate greater than 1000°C / S, the solidified product is added to the alkali solution heated to an extraction temperature of 10-100°C under stirring, to fully react the silicon in the alloy with the alkali, and then decant the liquid, After the solid sampl...

Embodiment 1

[0026] Add 1.5kg of copper and 1.5kg of silicon into the graphite crucible, heat it in a high-frequency furnace until it melts, and then spray the melt from the nozzle of the crucible onto a copper roller with a rotational speed of 600 to 1000 rpm. Cooling water is passed through the copper roller, and the alloy liquid is rapidly cooled at a cooling rate above 1000°C / s, and then thrown out along the tangent of the copper roller to form scale-like strips, which are ground to a particle diameter of less than 500 microns to obtain the mother alloy. Slowly add 50 g of the master alloy into a three-neck flask filled with 500 g of 20 wt % sodium hydroxide aqueous solution, control its temperature to 60° C. and keep stirring at constant temperature for 1 hour. After stopping heating and stirring, decant the liquid; then add it into 100 g of 20 wt% nitric acid solution, control the temperature at 80° C. and keep stirring for 1 hour. Wash with distilled water at 90°C to pH 7. The pre...

Embodiment 2

[0028] Add 1.5kg of copper, 1.0kg of silicon and 0.5kg of iron into a graphite crucible, heat it in a high-frequency furnace until it melts, and then spray the melt from the nozzle of the crucible onto a copper roller with a rotational speed of 900 rpm , cooling water is passed through the copper roller, the alloy liquid is rapidly cooled at a cooling rate above 1000°C / s, and then thrown out along the tangent line of the copper roller to form scale-like strips, which are ground to a particle diameter of less than 500 microns to obtain master alloy. Slowly add 50 g of the master alloy into a three-neck flask filled with 500 g of 20 wt % sodium hydroxide aqueous solution, control its temperature to 60° C. and keep stirring at constant temperature for 1 hour. After stopping heating and stirring, decant the liquid; then add it into 100 g of 20 wt% nitric acid solution, control the temperature at 80° C. and keep stirring for 1 hour. Wash with distilled water at 80°C to pH 7. The ...

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Abstract

The invention discloses a copper catalyst. The copper catalyst is characterized by containing 20-95wt% of copper and 0.5-70wt% of silicon. The catalyst is obtained by heating copper, silicon and / or transition metals until the components are molten, cooling and curing the melt and carrying out extraction treatment on the alloy obtained after curing with an alkali-acid solution to extract part of silicon. The catalyst has higher activity and selectivity than conventional copper catalysts and has good stability when used in the silicon tetrachloride hydrogenation reaction.

Description

technical field [0001] The invention relates to a silicon tetrachloride copper hydride catalyst and a preparation method thereof, in particular to a high-strength, high-stability silicon tetrachloride hydrogenation preparation copper trichlorosilane copper catalyst and a preparation method thereof. Background technique [0002] In recent years, with the depletion of traditional energy sources worldwide and the continuous increase in oil prices, the world is actively developing and utilizing renewable energy. As a renewable clean energy, solar energy has developed rapidly because of its cleanliness, safety and abundant resources. Therefore, the demand for high-purity polycrystalline silicon as a raw material for solar cells is increasing. [0003] The production of 1 ton of polysilicon in polysilicon production will produce more than 10 tons of silicon tetrachloride and about 1-5 tons of hydrogen chloride. Since there is no large-scale, efficient and safe digestion and trea...

Claims

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Application Information

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IPC IPC(8): B01J23/72B01J23/745B01J23/75B01J23/755B01J23/885B01J23/89C01B33/107
Inventor 张晓昕王宣孟祥堃吴佳舒兴田慕旭宏罗一斌宗保宁
Owner CHINA PETROLEUM & CHEM CORP
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