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Fe3O4/CuO/pSiO2 catalyst and preparation method thereof

A catalyst, fe3o4 technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, chemical instrument and method, etc., can solve the problems of increased separation difficulty, catalyst loss, complex equipment, etc. Achieve the effects of improving recycling rate, prolonging service life, reducing production and maintenance costs

Inactive Publication Date: 2012-09-26
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, catalyst recovery requires traditional separation techniques such as filtration and centrifugation, which takes a long time. For nano-scale materials, the equipment required is more complicated, separation difficulty increases, and catalyst loss is also serious.

Method used

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  • Fe3O4/CuO/pSiO2 catalyst and preparation method thereof
  • Fe3O4/CuO/pSiO2 catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Fe 3 o 4 Preparation of magnetic microspheres: Weigh a certain amount of FeCl 3 ·6H 2 O was dissolved in deionized water with a concentration of 0.24mol / L, stirred at room temperature and continuously fed with high-purity nitrogen gas, the stirring rate was 280rpm, the stirring time was 40min, and an appropriate amount of FeCl was added 2 4H 2 O, and continue to react for 30min; raise the temperature to 80°C, and quickly add a certain amount of NH 3 ·H 2 O (containing ammonia 25~28%), in order to increase the hydrophilicity of its surface, inject 1.2mol / L citric acid solution drop by drop; 3 o 4 magnetic microspheres. Among them, FeCl 2 4H 2 O, FeCl 3 ·6H 2 O. The molar ratio of ammonia water to citric acid is about 1:2:200:2.

[0027] Weigh a certain amount of PVP (molecular weight 58,000) and dissolve it in deionized water to prepare a solution with a concentration of 3.6mol / L; secondly, add an appropriate amount of the above-prepared Fe 3 o 4 Magne...

Embodiment 2

[0033] (1) Fe 3 o 4 Preparation of magnetic microspheres: Weigh a certain amount of FeCl 3 ·6H 2 O was dissolved in deionized water with a concentration of 0.20mol / L, stirred at room temperature and continuously fed with high-purity nitrogen, the stirring rate was 300rpm, the stirring time was 30min, and an appropriate amount of FeCl was added 2 4H 2 O, and continue to react for 40min; heat up to 80°C, and quickly add a certain amount of NH 3 ·H 2 O (containing ammonia 25~28%), in order to increase its surface hydrophilicity, inject 1.1mol / L citric acid solution drop by drop; after the dropwise addition, react for 70min; vacuum dry to obtain Fe 3 o 4 magnetic microspheres. Among them, FeCl 2 4H 2 O, FeCl 3 ·6H 2 O. The molar ratio of ammonia water to citric acid is about 1:2:200:2.

[0034] Weigh a certain amount of PVP (molecular weight 58,000) and dissolve it in deionized water to prepare a solution with a concentration of 4.0mol / L; secondly, add an appropriate ...

Embodiment 3

[0040] (1) Fe 3 o 4 Preparation of magnetic microspheres: Weigh a certain amount of FeCl 3 ·6H 2 O was dissolved in deionized water with a concentration of 0.22mol / L, stirred at room temperature and continuously fed with high-purity nitrogen, the stirring rate was 310rpm, the stirring time was 25min, and an appropriate amount of FeCl was added 2 4H 2 O, and continue to react for 25min; heat up to 80°C, quickly add a certain amount of NH 3 ·H 2 O (containing ammonia 25~28%), in order to increase its surface hydrophilicity, inject 1.2mol / L citric acid solution drop by drop; 3 o 4 magnetic microspheres. Among them, FeCl 2 4H 2 O, FeCl 3 ·6H 2 O. The molar ratio of ammonia water to citric acid is about 1:2:200:2.

[0041] Weigh a certain amount of PVP (molecular weight 58000) and dissolve it in deionized water to prepare a solution with a concentration of 3.8mol / L; secondly, add an appropriate amount of the above-prepared Fe 3 o 4 Magnetic microspheres, ultrasonical...

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Abstract

The invention relates to a Fe3O4 / CuO / pSiO2 (porous silica) catalyst, a preparation method thereof and application thereof in olefin epoxidation reaction. The preparation method comprises the following processes of: obtaining Fe3O4 microspheres serving as magnetic cores by adopting a co-precipitation method, and modifying the surfaces of the Fe3O4 microspheres by using polyvinyl pyrrolidone (PVP) in order to improve the adsorption effect of the surfaces of the Fe3O4 microspheres on metal cations; coating a CuO nano shell layer on the surfaces of the Fe3O4 microspheres by using copper acetate as a copper source through hydrothermal synthesis; and finally, coating the porous silicon dioxide shell layer by using cetyl trimethyl ammonium bromide (CTAB) as a surfactant and using ethyl orthosilicate as a silicon source, and thus obtaining a composite catalytic material with a magnetic Fe3O4 / CuO / pSiO2 core-shell structure. The catalytic performance of the composite material is researched by respectively using epoxidation reaction of styrene and cyclooctene as probe reaction, and the results prove that the catalytic material has high reaction activity and selectivity, and the catalytic material is easy to separate and recover by introducing the magnetic ores; and the catalytic material has a good circulating effect, still can keep excellent catalytic performance by dozens of times of circulation, and has a great application prospect.

Description

technical field [0001] The invention belongs to the field of magnetic nano catalytic materials, and relates to a Fe with a core-shell structure 3 o 4 / CuO / pSiO 2 Preparation of Magnetic Composite Catalytic Materials and Its Application in Olefin Epoxidation. Background technique [0002] Olefin epoxidation reaction is an important class of catalytic oxidation reaction, its product "olefin epoxide" is known as "the most valuable organic intermediate", and its downstream products are widely used in petrochemical, polymer synthesis, organic Synthesis, fine chemicals, biomedicine and many other fields have a wide range of applications and a large market demand, which can generate huge economic benefits. However, its production process must rely on catalytic materials to achieve a series of purposes such as protecting the environment, simplifying the process, shortening the reaction time, increasing production, and reducing production costs. Therefore, the preparation and inn...

Claims

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Application Information

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IPC IPC(8): B01J23/745C07D301/19C07D303/04
Inventor 王戈张晓伟黄铌郭万春高鸿毅杨穆王倩
Owner UNIV OF SCI & TECH BEIJING
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