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Synthesis method of single dispersing nano-cerium ion modified mesoporous silicon oxide material

A synthetic method and monodisperse technology, applied in molecular sieve catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of low chemical activity and achieve good order, high specific surface area, and high specific surface area.

Inactive Publication Date: 2006-09-06
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, MCM-41 is a pure silicon molecular sieve after all, and its chemical activity is not high. In order to improve its chemical activity and increase its industrial application value, it has become a very important way to introduce heteroatoms into its skeleton.

Method used

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  • Synthesis method of single dispersing nano-cerium ion modified mesoporous silicon oxide material
  • Synthesis method of single dispersing nano-cerium ion modified mesoporous silicon oxide material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Dissolve 6.0g of cetyltrimethylammonium bromide and 10.56g of F127 (PEO-PPO-PEO, average molecular weight 11000) in 600g of ammonia solution (the amount of ammonia water is 36.96g), fully stir at 30°C, and wait until After the surfactant is completely dissolved, add 20 g of tetraethyl orthosilicate, continue stirring at room temperature for 0.5 hours, add 0.38 g of cerous nitrate (dissolved in 5 g of deionized water), and continue stirring for 0.5 hours to obtain a transparent sol, which is transferred to a constant temperature In a drying oven, dry the water at 100°C to obtain a powder, and bake at a high temperature of 550°C for 6 hours to obtain the final yellow monodisperse nanometer Ce-MCM-41 molecular sieve powder.

[0021] figure 1 It is the particle transmission electron microscope photo of the sample. The transmission electron microscope photo shows monodisperse uniform spherical particles with a particle size of 70-80nm. The XRD spectrum shows an ordered hexag...

Embodiment 2

[0023] Dissolve 5.2g of dodecyltrimethylammonium bromide and 10.56g of F127 (PEO-PPO-PEO, average molecular weight 11000) in 600g of ammonia solution (61.60g of ammonia water), fully stir at 30°C, and wait until After the surfactant is completely dissolved, add 20 g of tetraethyl orthosilicate, continue stirring for 1 hour at 30 ° C, add 0.38 g of cerous nitrate (dissolved in 5 g of deionized water), and continue stirring for 1 hour to obtain a transparent sol, which is transferred to In a constant temperature drying oven, the water was dried at 80°C to obtain a powder, and then fired at a high temperature of 550°C for 6 hours to obtain the final monodisperse nanometer Ce-MCM-41 molecular sieve powder.

[0024] The transmission electron microscope photos show monodisperse uniform spherical particles with a particle size of about 100nm, the XRD spectrum shows an ordered hexagonal mesoporous structure, the nitrogen adsorption and desorption spectrum shows a mesoporous structure w...

Embodiment 3

[0026] With 6.0g cetyltrimethylammonium bromide and 5.28g F127 (PEO-PPO-PEO, average molecular weight 11000), be dissolved in 1500g sodium hydroxide solution (2M sodium hydroxide 14.5ml), in 80 Fully stir at ℃, after the surfactant is completely dissolved, add 20 g of tetraethyl orthosilicate, continue stirring at 80 ℃ for 1 hour, add 0.76 g of cerous nitrate (dissolved in 5 g of deionized water), and continue stirring for 2 hours, Obtain a transparent sol, transfer it to a constant temperature drying oven, dry the water at 80°C to obtain a powder, and bake at a high temperature of 550°C for 10 hours to obtain the final monodisperse nanometer Ce-MCM-41 molecular sieve powder.

[0027] figure 2 It is a transmission electron microscope photo of the particle. The transmission electron microscope photo shows monodisperse uniform spherical particles with a particle size of 60-90nm. The XRD spectrum shows an ordered hexagonal mesoporous structure, and the nitrogen adsorption and de...

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Abstract

The invention provides a synthetic method for monodispersed nano Ce-MCM-41 molecular sieve, which comprises using surface active agent as pattern agent, three segmented copolymer as adjuvant, cerous nitrate as Ce source, forming sol reaction liquid under temperate alkaline condition, thus synthesizing monodispersed Ce-MCM-41 molecular sieve with nano level homogeneous spherical particles, better ordered mesoporous passages, higher specific surface area and larger pore volume.

Description

technical field [0001] The invention belongs to the technical field of inorganic nanometer materials, and in particular relates to a method for synthesizing monodisperse nanometer Ce-MCM-41 molecular sieves. technical background [0002] In 1992, Mobil Corporation of the United States first synthesized M41S series mesoporous molecular sieve materials with regular pore structure, opening up a new era of molecular sieve synthesis. Among them, MCM-41 is a member of the M41S family. In recent years, there have been many reports on the synthesis and characterization of MCM-41. Its pores are arranged in an orderly hexagonal manner, and it has a large specific surface area and adsorption capacity. However, MCM-41 is a pure silicon molecular sieve after all, and its chemical activity is not high. In order to improve its chemical activity and increase its industrial application value, introducing heteroatoms into its skeleton has become a very important way. In this paper, metal ce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/04B01J29/04
Inventor 张劲松梁艳张军旗
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI