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Iron catalyst and preparation method and application thereof

An iron catalyst, fast curing technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of impurities entering the follow-up system, low copper melting point, and parking loss And other issues

Active Publication Date: 2015-05-20
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 generated by the alumina carrier during the hydrogenation process are continuously brought into the follow-up system in the form of steam under the condition of 450-500 ° C, which reduces the purity of the product trichlorosilane and contributes to the purification of the product. bring adverse effects
[0009] 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 the follow-up system as impurities; Activation treatment is carried out at a temperature higher than 400°C; (5) the cost is higher

Method used

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  • Iron catalyst and preparation method and application thereof
  • Iron catalyst and preparation method and application thereof

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preparation example Construction

[0017] The method for preparing the iron catalyst provided by the present invention is to heat iron, silicon, and or without transition metals to melt, cool the melt to solidify, and use an alkali-acid solution to extract the solidified alloy to extract part of the silicon. Obtain a catalyst. When used in the hydrosilylation reaction of tetrachloride, the catalyst has higher activity and selectivity than conventional catalysts, and has good stability. More specifically, the preparation method will be composed of iron, silicon, and or not and at least one selected from the periodic table of the elements IB, IIB, IIIB, IVB, VIB, VIIB or VIII of the transition metal composition of the alloy melt with A cooling rate greater than 1000℃ / S solidifies quickly. The solidified product is added to the lye heated to the extraction temperature of 10-100℃ under stirring to make the silicon in the alloy fully react with the alkali, and then the liquid and solid samples are decanted After was...

Embodiment 1

[0027] Add 1.5kg of iron and 1.5kg of silicon to the graphite crucible, heat it in a high frequency furnace to melt, and then spray the molten liquid from the nozzle of the crucible onto a copper roller with a rotation speed of 600 to 1000 / min. Cooling water is passed through the roll, and the alloy liquid is rapidly cooled at a cooling rate above 1000°C / s and then thrown into the water along the tangent line of the copper roll to form scaly strips. The scaly strips are ground to a particle diameter of 500 microns or less. Master alloy. 50 g of the master alloy was slowly added to a three-necked flask containing 500 g of 20 wt% sodium hydroxide aqueous solution, and the temperature was controlled to 60° C. and stirred at a constant temperature for 1 hour. After the heating and stirring are stopped, the liquid is decanted, and distilled water is added to wash until the pH value is less than 10; then it is added to 100 g of 20wt% nitric acid solution, the temperature is controlle...

Embodiment 2

[0029] Add 1.5kg of iron, 1.0kg of silicon and 0.5kg of nickel to the graphite crucible, heat it in a high-frequency furnace to melt, and then spray the molten liquid from the nozzle of the crucible onto a copper roller with a rotation speed of 900 rpm , Cooling water is passed through the copper roller, the alloy liquid is rapidly cooled at a cooling rate of more than 1000℃ / s, and then thrown into the water along the tangent line of the copper roller to form scaly strips. The scaly strips are ground to a particle diameter of 500 microns or less , Get the master alloy. 50 g of the master alloy was slowly added to a three-necked flask containing 500 g of 20 wt% sodium hydroxide aqueous solution, and the temperature was controlled to 60° C. and stirred at a constant temperature for 1 hour. After the heating and stirring are stopped, the liquid is decanted, and distilled water is added to wash until the pH value is less than 10; then it is added to 100 g of 20wt% nitric acid solut...

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Abstract

The invention discloses an iron catalyst. The iron catalyst contains 20-95wt% of iron and 0.5-70wt% of silicon. A preparation method of the catalyst is characterized by heating iron, silicon and a transition metal M until the components 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 present invention relates to an iron catalyst, a preparation method and its application, and more specifically to an iron catalyst for the hydrogenation of silicon tetrachloride to produce trichlorosilane, a preparation method and its application in the hydrogenation of silicon tetrachloride Applications. Background technique [0002] In recent years, with the depletion of world traditional energy sources 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 polysilicon 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 to 5 tons of hydrogen chloride. Since there is no large-scale, efficient and safe dig...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/745B01J23/755B01J23/75B01J23/881B01J23/89C01B33/107
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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