Silicon dioxide mesoporous material and its preparing method

A technology of silica and mesoporous materials, applied in the direction of silica, silica, chemical instruments and methods, etc., can solve the problems of large diffusion resistance, unfavorable material transmission, and large internal diffusion resistance in one-dimensional pores

Inactive Publication Date: 2004-07-14
XIAMEN NANOTECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because its pores are parallel to the surface of the support, the internal diffusion resistance is large
[0008] The main problem in the research of mesoporous materials is that the research of mesoporous materials is mainly concentrated on MCM-41, and there is little research on mesoporous materials with other structures. It can be known by estimation that the Knudsen diffusion coefficient D K =7.3×10 -2 cm 2 / s (calculated as methane), therefore, the internal diffusion resistance is large, which is not conducive to the transmission of substances

Method used

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  • Silicon dioxide mesoporous material and its preparing method
  • Silicon dioxide mesoporous material and its preparing method
  • Silicon dioxide mesoporous material and its preparing method

Examples

Experimental program
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Effect test

Embodiment 1

[0075] Embodiment 1 The preparation method of thin-shell nanometer mesoporous spheres

[0076] Take by weighing 40nm calcium carbonate powder (cubic) 8.7g, add deionized water 50g, add 2.5g cetyltrimethylammonium bromide (CTMAB) and 13.2g (about 15ml) analytical pure ammonia water, Then add 60g of ethanol, stir for 15min at a rotating speed of 300rpm, add tetraethyl orthosilicate (TEOS) according to silicon dioxide / calcium carbonate=0.15 (weight ratio), stir for 2 hours, filter and wash the filter cake with an appropriate amount of ethanol. Dry in an oven at a temperature of 90°C, and bake in a muffle furnace at a temperature of 550°C for 5 hours. Dissolve the sample with dilute hydrochloric acid, keep the pH below 1, and dry to obtain the product.

Embodiment 2

[0078] Preparation method of mesoporous hollow tube

[0079] Weigh 8.7g of calcium carbonate powder (needle) with a diameter of 200-300nm and an aspect ratio of 5, add 50g of deionized water, add 2.5g of cetyltrimethylammonium bromide (CTMAB) and 13.2g ( About 15ml) to analyze pure ammonia water, then add 60g ethanol, stir for 15min at a rotating speed of 300rpm, add tetraethyl orthosilicate (TEOS) according to silicon dioxide / calcium carbonate=0.2 (weight ratio), stir for 2 hours, filter, filter The cake was rinsed with an appropriate amount of ethanol, dried in an oven at a temperature of 90°C, and baked in a muffle furnace at a temperature of 550°C for 5 hours. Dissolve the sample with dilute hydrochloric acid, keep the pH below 1, and dry to obtain the product.

Embodiment 3

[0080] Example 3 The preparation method of thin-shell nanometer mesoporous spheres

[0081] Take by weighing barium carbonate 100nm (spherical) powder 10g, add deionized water 50g, add 3g cetyltrimethylammonium bromide (CTMAB) and 13.2g (about 15ml) analytical pure ammonia water, then add 60g ethanol, in Stir at 300rpm for 15min, add tetraethyl orthosilicate (TEOS) according to silica / barium carbonate = 0.2 (weight ratio), stir for 2 hours, filter, rinse the filter cake with an appropriate amount of ethanol, and dry in an oven at a temperature of 90 ℃, muffle furnace roasting, temperature 550 ℃, time 5h. Dissolve the sample with dilute hydrochloric acid, keep the pH below 1, and dry to obtain the product.

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Abstract

The mesoporous silica material consists of hollow silica grains with radically radial arranged hole canal in the wall. The present invention also provides the preparation process of the said mesoporous silica material, and the preparation process includes adopting calcium carbonate in different forms as inorganic template; growing and synthesizing mesoporous material on the surface and subsequent eliminating the inorganic template to obtain thin shell type mesoporous material in different forms. The present invention also provides the application of the mesoporous silica material in preparing catalyst, pesticide and optical fiber.

Description

field of invention [0001] The present invention relates to a silicon-based mesoporous material and a preparation method thereof, in particular to a silica mesoporous material and a preparation method thereof, more specifically to a silica with a specific pore size arrangement Mesoporous materials and methods for their preparation. Background technique [0002] Silica is a new type of porous inorganic material. It is widely used in rubber due to its special properties such as high purity, low density, high specific surface, surface silanol groups and active silane bonds that can form hydrogen bonds of varying strengths. , Pesticides, pharmaceuticals, papermaking, plastic processing, coatings, insulation, heat insulation, catalysis and other fields. [0003] According to the definition of the International Union of Pure and Applied Chemistry (IUPAC), molecular sieves with a channel (window) size smaller than 2.0 nm are microporous molecular sieves; molecular sieves with a por...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/113C01B33/12C01B37/02C01B39/00
CPCC01B33/113C01B39/00C01B33/12C01B37/02
Inventor 陈建峰刘润静吉米·云沈志刚
Owner XIAMEN NANOTECH
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