Catalyst, preparation method and application thereof

Abstract

The invention discloses a catalyst and a preparation method thereof. The method comprises: contacting a soluble nickel salt, a soluble salt compound of metal M, a silicon source able to provide silica with a precipitant able to precipitate nickel and / or metal M ions in a solvent, filtering the contact product, and drying and roasting the obtained solid in order, wherein the M is selected from one or more of I B, II B, II A and group VIII metals except Ni. The catalyst prepared according to the method provided by the invention can be applied in preparation of trichlorosilane by hydrogenation of silicon tetrachloride. Compared with conventional aluminum-based catalysts, the catalyst prepared by the method provided by the invention has the advantages that: in the reaction atmosphere of preparation of trichlorosilane by hydrogenation of silicon tetrachloride, the SiO2 carrier is stable, the catalyst skeleton is not easily damaged as the carriers in traditional hydrogenation catalysts, therefore the service life can be longer, and compared with nickel salt and copper salt catalysts commonly used in the prior art, the activity is enhanced.

Description

technical field

[0001] The invention relates to a catalyst preparation method, a catalyst prepared by the method, and an application thereof in preparing trichlorosilane by hydrogenation of silicon tetrachloride. 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] In the polysilicon production process, the production of 1 ton of polysilicon 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 the process of producing polysilicon 4 However,...

Examples

preparation example Construction

[0019] The invention provides a method for preparing a catalyst, wherein the method comprises: combining a soluble nickel salt, a soluble salt compound of metal M, a silicon source capable of providing silicon dioxide, and a precipitating agent capable of precipitating nickel and / or metal M ions Contacting in a solvent, filtering the contacted product, drying and calcining the obtained solid in sequence, wherein, the M is selected from one or more of Group VIII metals except Ni, IIB, IIA.

[0020] In the present invention, the amount of the soluble nickel salt, the silicon source, and the soluble salt compound of metal M can be selected in a wide range, and can be determined according to the amount of each component in the catalyst to be obtained. For the present invention, the preferred The amount of the soluble nickel salt, the silicon source and the soluble salt compound of the metal M makes the prepared catalyst, based on the total weight of the catalyst, in terms of oxides...

Embodiment approach

[0034] According to a preferred embodiment of the present invention, the present invention adopts following method to prepare catalyst:

[0035] 1) The soluble nickel salt and the soluble salt compound of metal M are prepared into aqueous solutions respectively, and the soluble nickel salt solution and the soluble salt compound aqueous solution of metal M are mixed to obtain a mixed solution, and a silicon source capable of providing silicon dioxide is added to the mixed solution A slurry is obtained in the solution, and the pH value of the slurry is adjusted;

[0036] 2) Then add a precipitant solution for contact, then filter, dry and roast.

[0037] In the present invention, in order to make the contact more sufficient, the contact is carried out under stirring conditions. In the examples of the present invention, the mixing and contacting of various substances are also carried out under stirring conditions, which will not be specifically emphasized later.

[0038] The inv...

Embodiment 1

[0048] (1) Dissolve 56.5 kilograms of nickel nitrate hexahydrate and 25 kilograms of ferric nitrate nonahydrate in deionized water to prepare 500 liters of solution, and add 320 kilograms of sodium silicate aqueous solution with a concentration of 10% by weight to the above mixed salt solution , mix uniformly to obtain the slurry, the pH value of the slurry is adjusted to 6 with a sodium hydroxide aqueous solution with a concentration of 5% by weight; 43 kilograms of anhydrous sodium carbonate are dissolved with 400 liters of deionized water to obtain an aqueous solution of sodium carbonate;

[0049] (2) Add the above-mentioned sodium carbonate aqueous solution and the slurry into a 2000-liter reactor for contacting, the contacting temperature is 80° C., and the pH is adjusted with a concentration of 5% by weight aqueous sodium hydroxide solution so that the contacting pH value is 7, and the contacting temperature is 7. After 4 hours, the solid was obtained by filtration, dried...

technical field

[0001] The invention relates to a catalyst preparation method, a catalyst prepared by the method, and an application thereof in preparing trichlorosilane by hydrogenation of silicon tetrachloride. 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] In the polysilicon production process, the production of 1 ton of polysilicon 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 the process of producing polysilicon 4 However,...

Examples

preparation example Construction

[0019] The invention provides a method for preparing a catalyst, wherein the method comprises: combining a soluble nickel salt, a soluble salt compound of metal M, a silicon source capable of providing silicon dioxide, and a precipitating agent capable of precipitating nickel and / or metal M ions Contacting in a solvent, filtering the contacted product, drying and calcining the obtained solid in sequence, wherein, the M is selected from one or more of Group VIII metals except Ni, IIB, IIA.

[0020] In the present invention, the amount of the soluble nickel salt, the silicon source, and the soluble salt compound of metal M can be selected in a wide range, and can be determined according to the amount of each component in the catalyst to be obtained. For the present invention, the preferred The amount of the soluble nickel salt, the silicon source and the soluble salt compound of the metal M makes the prepared catalyst, based on the total weight of the catalyst, in terms of oxides...

Embodiment approach

[0034] According to a preferred embodiment of the present invention, the present invention adopts following method to prepare catalyst:

[0035] 1) The soluble nickel salt and the soluble salt compound of metal M are prepared into aqueous solutions respectively, and the soluble nickel salt solution and the soluble salt compound aqueous solution of metal M are mixed to obtain a mixed solution, and a silicon source capable of providing silicon dioxide is added to the mixed solution A slurry is obtained in the solution, and the pH value of the slurry is adjusted;

[0036] 2) Then add a precipitant solution for contact, then filter, dry and roast.

[0037] In the present invention, in order to make the contact more sufficient, the contact is carried out under stirring conditions. In the examples of the present invention, the mixing and contacting of various substances are also carried out under stirring conditions, which will not be specifically emphasized later.

[0038] The inv...

Embodiment 1

[0048] (1) Dissolve 56.5 kilograms of nickel nitrate hexahydrate and 25 kilograms of ferric nitrate nonahydrate in deionized water to prepare 500 liters of solution, and add 320 kilograms of sodium silicate aqueous solution with a concentration of 10% by weight to the above mixed salt solution , mix uniformly to obtain the slurry, the pH value of the slurry is adjusted to 6 with a sodium hydroxide aqueous solution with a concentration of 5% by weight; 43 kilograms of anhydrous sodium carbonate are dissolved with 400 liters of deionized water to obtain an aqueous solution of sodium carbonate;

[0049] (2) Add the above-mentioned sodium carbonate aqueous solution and the slurry into a 2000-liter reactor for contacting, the contacting temperature is 80° C., and the pH is adjusted with a concentration of 5% by weight aqueous sodium hydroxide solution so that the contacting pH value is 7, and the contacting temperature is 7. After 4 hours, the solid was obtained by filtration, dried...

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