Process for preparing medium porous nano silicon dioxide powder with high activity

A nano-silica, high-activity technology, used in silica, silica, chemical instruments and methods, etc., can solve the problems of easy agglomeration and growth of original particles, high heat treatment temperature, large particle size, etc., and achieve reflection. The effect of strong UV ability, low heat treatment temperature and high interface ratio

Inactive Publication Date: 2003-11-26
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The combustion method is complex; the particle size obtained by the precipitation method is large and the structure is loose; the heat treatment temperature is high by the traditional sol-gel technology, and the Si-OH silanol groups on the surface of the silica are removed by high temperature, and the original Particles are easy to agglomerate and grow

Method used

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  • Process for preparing medium porous nano silicon dioxide powder with high activity
  • Process for preparing medium porous nano silicon dioxide powder with high activity
  • Process for preparing medium porous nano silicon dioxide powder with high activity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Prepare tetraethyl orthosilicate, absolute ethanol, hydrochloric acid, and distilled water at a volume ratio of 16:20:2:21. Preparation of SiO by hydrolysis-polycondensation reaction of silicates 2 Gel, after aging the wet gel at room temperature for 1 to 7 days, dry it in a vacuum oven at 50°C for 12 hours, then put the gel in a furnace preheated to 200°C for heat treatment , for 8 hours, after the furnace cools down naturally to obtain pure white, amorphous SiO with a particle size of 100-12nm 2 Secondary particle powder.

Embodiment 2

[0031] Prepare tetraethyl orthosilicate, absolute ethanol, hydrochloric acid, and distilled water at a volume ratio of 16:20.2:21. Preparation of SiO by hydrolysis-polycondensation reaction of silicates 2 Gel, after aging the wet gel at room temperature for 1 to 7 days, dry it in a vacuum oven at 50°C for 12 hours, then put the gel in a furnace preheated to 200°C for heat treatment , for 8 hours, after the furnace cools down naturally, pure white, amorphous SiO 2 Powder. The powder obtained above was ball milled for 48 hours to obtain a highly active powder with a particle size distribution of 5-30nm, an average pore size of 5.1-5.9nm, a porosity of 92%, a purity of 99.9%, and a surface hydroxyl content of 52%. Mesoporous nano-SiO 2 powder.

Embodiment 3

[0033] Prepare tetraethyl orthosilicate, absolute ethanol, hydrochloric acid, and distilled water at a volume ratio of 16:20.2:15. Preparation of SiO by hydrolysis-polycondensation reaction of silicates 2 Gel, after aging the wet gel at room temperature for 1 to 7 days, dry it in a vacuum oven at 40°C for 12 hours, then put the gel in a furnace preheated to 160°C for heat treatment , for 8 hours, after the furnace cools down naturally, pure white, amorphous SiO 2 Powder. The powder obtained above was ball milled for 20 hours to obtain a highly active powder with a particle size distribution of 20-50 nm, an average pore size of 5.1-5.9 nm, a porosity of 88%, a purity of 99.9%, and a surface hydroxyl content of 55%. Mesoporous nano-SiO 2 powder.

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Abstract

The preparation process of medium porous nano silica powder includes hydrolysis and condensation reaction of silicate ester to prepare SiO2 sol, preparing SiO2 gel, ageing and drying SiO2 gel. It features the heat The of aged and dried white amorphous SiO2 at 150-200 deg.c for 5-8 hr; and ball milling of the powder after heat treatment for 8-48 hr. The said process can produce medium porous nano SiO2 powder with grain size distribution of 5-50 nm, average pore diameter 5.1-5.9 nm, porosity 85-93 %, surface hydroxy content 51-55 %. The product may be used as selective absorbent, loaded catalyst and various sensors as well as in the production of ink absorbent, sunproof record paper and cosmetics. The produced powder has purity as high as 99.9 %, extremely high activity and low cost.

Description

Technical field: [0001] The invention relates to the preparation technology of silicon dioxide powder, and in particular provides a preparation method of mesoporous nanometer silicon dioxide powder with high activity. Background technique: [0002] Usually, nano-SiO 2 Powder is a new type of lightweight nano-scale amorphous solid material, which has the characteristics of low density, high specific surface area and high porosity, and is a non-toxic, odorless and pollution-free inorganic non-metallic material. It presents singular characteristics in sound, light, electricity, magnetism and thermodynamics, and has attracted the attention of many scientific and technological workers in recent years. It has important applications in the construction industry, chemical industry, medicine, special materials, special products in the aerospace industry, and crop seed treatment. [0003] nano-SiO 2 The preparation methods of powder generally include: combustion method (gas phase m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/14C01B33/157
Inventor 张瑞静杨柯熊天英
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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