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Green preparation method of transparent mesoporous sial gel monolith

A mesoporous silica-alumina and gel technology, applied in the field of inorganic porous materials, can solve the problems of unfavorable gel skeleton, increased preparation cost, harsh equipment requirements, etc., and achieves wide adjustable range, rich adjustable range, and reduced preparation cost effect

Inactive Publication Date: 2014-08-20
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Obviously, the use of such dangerous and corrosive inorganic strong acids as catalysts for the hydrolysis of organosilicon sources not only increases the preparation cost, but also easily causes environmental pollution, and the highly acidic synthesis medium is also not conducive to the embedding of high aluminum content in the gel skeleton. At the same time, there are strict requirements on equipment during industrial batch preparation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0016] Stir and mix 0.75 g of P123, 0.375 g of aluminum nitrate, 0.098 g of water and 1.12 ml of TEOS at room temperature, and continue to stir for 60 minutes after the system is completely homogeneous. The system will be gelled by standing at constant temperature for 1 hour, and then continue to age in a sealed state at 60°C for 1 day, and finally dry it directly at 60°C. After 48 hours, a complete transparent medium with the shape of a container is obtained. Porous silica-alumina gel monolith, then heated up to 600°C at a rate of 2°C / min and calcined for 6 hours to completely remove the surfactant template agent, and the specific surface area of ​​the mesoporous silica-alumina gel monolith was 397.1m 2 / g, the pore volume is 0.31cm 3 / g, the pore size is 3.6nm.

Embodiment approach 2

[0018]Stir and mix 0.5 g of P123, 0.094 g of aluminum nitrate, 0.188 g of water and 1.12 ml of TEOS at room temperature, and continue to stir for 60 minutes after the system is completely homogeneous. Stand at constant temperature for 1 hour at 60°C, then leave the container open at 60°C for 30 minutes to gel the system, then seal the container again and leave it at 60°C for aging for 1 day, and finally place it directly at 60°C Drying in the open, after 48 hours, a complete transparent mesoporous silica-alumina gel monolith with a container shape was obtained, and then the temperature was raised to 600°C at a rate of 2°C / min and calcined for 6 hours to completely remove the surfactant template agent to obtain a mesoporous silica-alumina gel monolith. Porous silica-alumina gel monolith has a specific surface area of ​​565.4m 2 / g, the pore volume is 0.41cm 3 / g, the pore size is 3.5nm.

Embodiment approach 3

[0020] Stir and mix 0.75 g of F127, 0.375 g of aluminum nitrate, 0.098 g of water, 1.5 ml of n-propanol and 1.12 ml of TEOS at room temperature, and continue stirring for 30 minutes after the system is completely homogeneous, and then transfer the prepared sol into a container with a certain shape After sealing, let it stand at a constant temperature at 60°C for 1 hour, then leave the container at 60°C for 3.5 hours to make the system gel, then seal the container again and leave it at a constant temperature at 60°C for 1 day, and finally directly Open-dried at 60°C, after 48 hours, a complete transparent mesoporous silica-alumina gel monolith with a container shape was obtained, and then heated to 600°C at a rate of 2°C / min and baked for 6 hours to completely remove the surfactant template agent, the specific surface area of ​​the mesoporous silica-alumina gel monolith is 447.9m 2 / g, the pore volume is 0.34cm 3 / g, the pore size is 3.5nm.

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Abstract

A green preparation method of transparent medium silicon aluminum gel monologue, which is the technology field of inorganic porous materials, which involves a large size, crackless, optical transparent medium silicon aluminum with a component SI / AL Moore ratio ≥ 3The rapid preparation method of gel done, this method does not need to add inorganic acid that is dangerous and corrosive as a catalyst, but the mild acid -induced sources of silicon sources produced by the addition of aluminum saline, the SI / The H2O Murbi range and combined with the method of system gelization realizes the direct exposure of silicon and aluminum wet gel to the dry gel at 45-75 ° C. This method is simple, efficient and environmentally friendly, product shape, product shapeThe rules, the size is controllable and transparent, it has extensive application value in the field of development of new optical devices. The surface area of the medium silicon aluminum gel obtained after roasting is 390-800m2 / g, and the volume of the hole isIt is 0.3-0.5cm3 / g, and the aperture is 1.9-4nm, which has a wide range of application prospects in the fields of catalytic, separation.

Description

technical field [0001] The invention relates to a green preparation method of transparent mesoporous silica-alumina gel monolith, which belongs to the technical field of inorganic porous materials, and specifically relates to a large-sized, crack-free, optically transparent mesoporous silicon with a component Si / Al molar ratio ≥ 3 Green preparation method of aluminum gel monolith. Background technique [0002] The transparent mesoporous gel monolith formed by surfactant as a template has high light transmittance, low external area and adjustable pore structure, which can make dye molecules, photosensitive molecules, semiconductor particles or Guest molecules such as conductive nanowires can be intercalated at a high concentration without mutual aggregation between molecules, so they have broad application prospects in the development of new optical devices. [0003] The synthesis of transparent mesoporous silica-alumina gel monolith, due to the introduction of Al atoms in t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B38/00
Inventor 王晓钟白亚东李祥珍谢克昌
Owner TAIYUAN UNIV OF TECH
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