Cobalt catalyst and preparation method and application thereof

A cobalt catalyst and catalyst technology, which is applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve material loss, low activity, and reduced Al and O content, etc. question

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
[0007] Therefore, traditional nickel-based and copper-based catalysts have the following disadvantages: (1) low activity and loss of active components; (2) active components agglomerate; (3) enter subsequent systems as impurities; Reduction at temperatures above 400°C

Method used

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  • Cobalt catalyst and preparation method and application thereof
  • Cobalt catalyst and preparation method and application thereof

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preparation example Construction

[0014] The preparation method of the cobalt catalyst provided by the invention is to heat cobalt, silicon, and transition metals to melt, cool the molten matter to solidify, and use an alkali-acid solution to extract the solidified alloy to extract part of the silicon. Get a 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.

[0015] More specifically, the preparation method will be composed of cobalt, silicon, and or not and at least one transition metal selected from the group IB, IIB, IIIB, IVB, VIB, VIIB or VIII of the periodic table of the elements. The cooling rate greater than 1000°C / S solidifies quickly, and the solidified product is added to the alkali solution heated to the extraction temperature of 10-100°C under stirring, so that the silicon in the alloy can fully react with the alkali, and then decant the liquid and solid samples Af...

Embodiment 1

[0024]Add 1.5kg of cobalt and 1.5kg of silicon 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 rotation speed of 600 to 1000 rpm. The cooling water is passed through the roller, the alloy liquid is rapidly cooled at a cooling rate greater than 1000°C / s, and then thrown into the water 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; add distilled water to wash until the pH value is less than 10; then add it to 100 grams of 20 wt% nitric acid solution, control the temperature at 80° C. and keep ...

Embodiment 2

[0026] Add 1.5kg of cobalt, 1.0kg of silicon and 0.5kg of nickel 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 , the cooling water is passed through the copper roller, and the alloy liquid is rapidly cooled at a cooling rate greater than 1000°C / s, and then thrown into the water 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 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; add distilled water to wash until the pH value is less than 10; then add it to 100 grams of 20 wt% nitric acid solution, control the temper...

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Abstract

The invention provides a cobalt catalyst. The cobalt catalyst contains 20-95wt% of cobalt and 0.5-70wt% of silicon. A preparation method of the catalyst is characterized by heating cobalt, silicon and a transition metal M until the metals are molten, quickly curing the melt at a cooling rate more than 1000 DEG C / S and carrying out extraction treatment on the alloy obtained after curing with an alkali-acid solution to extract part of silicon, thus obtaining the catalyst. The catalyst has higher activity and selectivity than conventional catalysts and has good stability when used in the silicon tetrachloride hydrogenation reaction.

Description

technical field [0001] The invention relates to a cobalt catalyst, a preparation method and its application, in particular to a high-strength, high-stability silicon tetrachloride hydrogenation preparation trichlorosilane cobalt 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 treatment of SiCl produced in th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75B01J23/755B01J23/882B01J23/89C01B33/107
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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