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Metaporous silicon dioxide material and its preparing method

A mesoporous silica and mesoporous technology, applied in the direction of silica, silicon oxide, chemical instruments and methods, etc., can solve the problems of large amount of surfactant, material structure damage, difficult removal, etc. The effect of small dosage and concentrated hole distribution

Inactive Publication Date: 2005-08-03
SHANXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The amount of surfactant is large. On the one hand, it is not easy to remove and it is easy to damage the material structure when it is removed. On the other hand, it is easy to pollute the environment.

Method used

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  • Metaporous silicon dioxide material and its preparing method
  • Metaporous silicon dioxide material and its preparing method
  • Metaporous silicon dioxide material and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Add 0.3156g of DDAC to 41g of distilled water and mix, place in an ultrasonic cleaner at 50°C for 1 hour to obtain a transparent and clear surfactant solution, adjust the pH of the solution to about 12.0 with NaOH, stir at 50°C and slowly add 2.0833 g orthosilicate, continue to stir for 24 hours, a large amount of white precipitates will form along with the stirring, seal and age at 70°C for 4 days, filter, wash with distilled water, and dry, then reflux the precipitates in methanol / hydrochloric acid solution for 48 hours, wash with methanol After drying, the mesoporous silica material is obtained. The characterization results are shown in the accompanying drawings: figure 1 , figure 2 , image 3 (Other embodiments are similar to this figure). Mesoporous silica material BET specific surface area: 372.90m 2 / g; Pore volume: 0.80m 3 / g; pore size 3.7nm.

Embodiment 2

[0018] Add 0.3156g of DDAC to 41g of distilled water and mix, place in an ultrasonic cleaner at 50°C for 30 minutes to obtain a uniform and transparent surfactant solution, adjust the pH of the solution to 12.0 with NaOH, stir at 20°C and slowly add 2.0833g of positive Ethyl silicate, continue to stir for 24 hours, a large amount of white precipitates will form along with the stirring, seal and age at 70°C for 4 days, filter, wash with distilled water, and dry, then reflux the precipitate in methanol / hydrochloric acid solution for 48 hours, wash with methanol, and dry After that, the mesoporous silica material is obtained. Mesoporous silica material BET specific surface area: 836.79m 2 / g; Pore volume: 1.10m 3 / g; pore size 3.6nm.

Embodiment 3

[0020] Add 0.3156g of DDAC to 41g of distilled water and mix, place in an ultrasonic cleaner at 50°C for 1 hour to obtain a uniform and transparent surfactant solution, adjust the pH of the solution to 11.9 with NaOH, stir at 70°C and slowly add 2.50g of positive Ethyl silicate, a large amount of white precipitate will form after the dropwise addition, continue to stir for 24 hours, seal and age at 70°C for 4 days, filter, wash with distilled water, and dry, then reflux the precipitate in methanol / hydrochloric acid solution for 48 hours, wash with methanol, After drying, the mesoporous silica material is obtained. Mesoporous silica material BET specific surface area: 674.5m 2 / g; Pore volume: 0.86m 3 / g; pore size 3.5nm.

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Abstract

The mesoporous silicon dioxide material has mesopore diameter of 3.5-4.0 nm, pore volume of 0.80-1.1 cu cm / g and specific surface area of 372.9-836.8 sq cm / g,. The material is one kind of latent industrial catalyst carrier. The preparation process has dioctadecyl dimethyl ammonium chloride as template agent and ethyl silicate as silicon source, and under alkaline condition, white precipitate is prepared and refluxed in methanol / hydrochloric acid solution to eliminate surfactant. The preparation process is simple, novel, low in surfactant amount and environment friendly, and opens one way for the application of double alkyl chain quaternary ammonium salt surfactant in material and catalyst field.

Description

1. Technical field [0001] The invention relates to a mesoporous silica material, in particular to a mesoporous silica material prepared by using double-chain quaternary ammonium salt cationic surfactant dioctadecyldimethylammonium chloride (DDAC) as a template agent and its preparation method. 2. Background technology [0002] Synthesizing inorganic materials with specific structures by utilizing the interface interaction between self-assembled organic molecules and inorganic substances, and effectively controlling their structure, morphology and properties, has become a hotspot in the research of materials chemistry. In 1992, the researchers of Mobile Company used high concentration C for the first time n h 2n+1 Me 3 M41S series mesoporous molecular sieves were prepared with Br(n>6) type cationic surfactants as templates. Because of their high specific surface area, large pore volume, regular mesoporous channels, and adjustable pore diameter, they are widely used in ...

Claims

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Application Information

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IPC IPC(8): B01J21/08C01B33/18C01B39/04
Inventor 赵永祥李玉霞高春光白利红刘滇生
Owner SHANXI UNIV
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