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Method for preparing composite material of silicon carbide of biological appearance and molecular sieve

A composite material and molecular sieve technology, which is applied in the field of preparation of biomorphic porous silicon carbide and molecular sieve composite materials, to achieve the effect of facilitating the transmission of matter and energy, overcoming poor thermal conductivity, and uniform and stable load

Active Publication Date: 2009-09-16
SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation of molecular sieve composite materials with biospherical silicon carbide as the carrier has not been reported. The special hierarchical porous structure of this carrier will make it have broad application prospects in the fields of catalysis, separation and petrochemical industry.

Method used

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  • Method for preparing composite material of silicon carbide of biological appearance and molecular sieve
  • Method for preparing composite material of silicon carbide of biological appearance and molecular sieve
  • Method for preparing composite material of silicon carbide of biological appearance and molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Add 17ml of tetrapropylammonium hydroxide (TPAOH) to 20ml of water to dissolve, add 0.6g of sodium hydroxide to it, stir for 30 minutes to fully mix the two; then add sodium metaaluminate (NaAlO 2 , 0.246g) of 10ml of aqueous solution, continued to stir for 30min, then slowly added 22.4ml of tetraethyl orthosilicate (TEOS) dropwise, and stirred at room temperature for 6 hours to obtain a sol of ZSM-5 molecular sieve.

[0030] Put the dried sorghum into a tube furnace, and carbonize at 600°C for 5 hours under the protection of argon; take 28 grams of silicon powder and 12 grams of carbonized biomass, mix them thoroughly, and put them in a high-temperature furnace under the protection of argon. Keep the temperature at 1200°C for 5 hours. Then treat in air at 600°C for 4 hours to remove unreacted carbon, pickle with nitric acid and hydrofluoric acid (1:3) for 36 hours to remove unreacted silicon, and obtain spherical porous SiC.

[0031]Take 0.4 g of the above-mentioned b...

Embodiment 2

[0033] 25.5ml of tetrapropylammonium hydroxide (TPAOH) was added into 30ml of water to dissolve, 0.6g of sodium hydroxide was added thereto, stirred for 30 minutes to fully mix the two; then aluminum sulfate (Al 2 (SO 4 ) 3 18H 2 (2, 2g) aqueous solution 15ml, continue to stir for 30min and then slowly add 22.4ml tetraethyl orthosilicate (TEOS) dropwise, and stir at normal temperature for 10 hours to obtain the sol of ZSM-5 molecular sieve.

[0034] Put the dried millet into a tube furnace, and carbonize at 800°C for 3 hours under the protection of argon; take 34 grams of silicon powder and 6 grams of carbonized biomass, mix them thoroughly, and put them in a high-temperature furnace under the protection of argon. Inner 1300 ℃ constant temperature for 3 hours. Then treat in air at 400°C for 6 hours to remove unreacted carbon, pickle with nitric acid and hydrofluoric acid (1:6) for 24 hours, remove unreacted silicon, and obtain spherical porous SiC.

[0035] Take 0.6 g of t...

Embodiment 3

[0037] Add 2.6ml of n-butylamine (NAB) into 20ml of water to dissolve, add 0.3g of sodium hydroxide to it, stir for 30 minutes to make the two fully mixed; then add aluminum nitrate (Al(NO 3 ) 3 9H 2 (2.496g) of aqueous solution 10ml, continue to stir for 30min and slowly add 16.8ml of water glass (sodium silicate aqueous solution) dropwise, and stir at normal temperature for 6 hours to obtain the sol of ZSM-5 molecular sieve.

[0038] Put the dried sorghum into a tube furnace, and carbonize at 700°C for 10 hours under the protection of argon; take 16 grams of silicon powder and 5 grams of carbonized biomass, mix them thoroughly, and put them in a high-temperature furnace under the protection of argon. Inner 1350 ℃ constant temperature for 4 hours. Then treat in air at 500°C for 5 hours to remove unreacted carbon, pickle with nitric acid and hydrofluoric acid (1:4) for 72 hours to remove unreacted silicon, and obtain spherical porous SiC.

[0039] Take 0.3 g of the above-me...

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Abstract

A method for preparing a composite material of silicon carbide of biological appearance and a molecular sieve comprises the following steps: processing the silicon carbide of biological texture in mixed solution of nitric acid and hydrofluoric acid, mixing aqueous solution dissolved with template agent and aqueous solution of sodium hydroxide and then adding alumina, adding and then stirring silicon dioxide to obtain molecular sieve sol; pumping out the obtained silicon carbide of biological texture, pumping the molecular sieve sol into a vessel and placing the sol into a high-pressure autoclave after being mixed with the silicon carbide of biological texture; aging the mixture at the temperature of 20-80 DEG C for 3-12h, and then crystallizing the mixture at the temperature of 20-180 DEG C for 12-96h, and naturally cooling the mixture; taking out the reactant, filtering the reactant by pumping and washing the reactant to neutral by distilled water, and drying the reactant at the temperature of 80-120 DEG C for 12-36h; separating granules in the product from molecular sieve powder and roasting the granules at the temperature of 400-600 DEG C for 2-6h to obtain the composite material. The composite material prepared by the invention maintains the appearance and microstructure similar to the appearances and microstructures of parent substances and has the advantages of both the silicon carbide and the molecular sieve.

Description

technical field [0001] The invention relates to a preparation method of a composite material, in particular to a preparation method of a biomorphic porous silicon carbide and molecular sieve composite material. Background technique [0002] In recent years, the research on biomass ceramic materials has received widespread attention. Biomass ceramic materials are materials transformed from biomass that maintain the shape and unique structural characteristics similar to the raw materials, and at the same time have ceramic properties. Among them, biomass silicon carbide has broad application prospects in the fields of catalysis and chemical industry due to its good mechanical strength, thermal stability, chemical inertness, and thermal and electrical conductivity. [0003] Biomass silicon carbide is generally prepared by carbonization and high-temperature siliconizing by using wood, rice straw, sorghum, etc. as templates. The preparation method has been reported in Chinese pate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/565C04B35/624C04B38/00
Inventor 郭向云王英勇靳国强
Owner SHANXI INST OF COAL CHEM CHINESE ACAD OF SCI
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