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Preparation method and application of multiple magnetic mesoporous catalysts

A catalyst and mesoporous technology, which is applied in the preparation and application of multi-element magnetic mesoporous catalysts, can solve the problems of easy agglomeration, reduced catalytic activity, large specific surface energy, etc., so as to shorten the separation time and reduce production costs. Effect

Inactive Publication Date: 2015-02-18
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to improve the catalytic activity of nano-silver, the purpose of its preparation is to obtain monodisperse and shape-controllable particles, but because of its large specific surface energy, it is easy to agglomerate during the synthesis and catalytic process, resulting in a decrease in its catalytic activity.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A surface carboxylated Fe 3 o 4 The preparation method of microspheres: add 1.40g ferric chloride, 0.50g trisodium citrate, 2.5g sodium acetate to 40mL ethylene glycol, ultrasonically disperse at room temperature for 5min, transfer the mixture to a 100mL autoclave, heat To 200°C, keep warm for 8h-10h, cool to room temperature, separate by magnet adsorption, wash the solid with a mixture of ethanol and water with a volume ratio of 1:1 for 3 times, separate by magnet adsorption each time, and dry to obtain a surface Carboxylated Fe 3 o 4 Microspheres, the particle size is about 150nm.

Embodiment 2

[0034] A surface carboxylated Fe 3 o 4 Preparation method of microspheres: Add 1.45g ferric chloride, 0.70g trisodium citrate, 3.0g sodium acetate to 40mL ethylene glycol, ultrasonically disperse at room temperature for 5min, transfer the mixture to a 100mL autoclave, heat Heat at 200°C for 10 hours, cool to room temperature, separate by magnet adsorption, wash the solid three times with a mixture of ethanol and water with a volume ratio of 1:1, separate by magnet adsorption each time, and dry to obtain surface carboxylation Fe 3 o 4 microspheres; the Fe 3 o 4 Microspheres, the particle size is about 180nm.

Embodiment 3

[0036] A surface carboxylated Fe 3 o 4 Preparation method of microspheres: Add 1.42g ferric chloride, 0.60g trisodium citrate, 2.7g sodium acetate to 40mL ethylene glycol, ultrasonically disperse at room temperature for 5min, transfer the mixture to a 100mL autoclave, heat To 200°C, keep warm for 8h-10h, cool to room temperature, separate by magnet adsorption, wash the solid with a mixture of ethanol and water with a volume ratio of 1:1 for 3 times, separate by magnet adsorption each time, and dry to obtain a surface Carboxylated Fe 3 o 4 microspheres; the Fe 3 o 4 Microspheres, the particle size is about 170nm.

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Abstract

The invention relates to a preparation method and application of multiple magnetic mesoporous catalysts, and belongs to the technical fields of material science, nanometer materials, chemical industries, catalysis and the like. The method disclosed by the invention comprises the following steps: performing ultrasonic treatment for Fe3O4 microspheres of which the surfaces are carboxylated, zinc nitrate, cyanuric chloride tribasic carboxylic acids H3L and ethyl orthosilicate in one step to obtain Fe3O4@-MOF@SiO2, dipping the composite materials in a silver nitrate solution, and illuminating the composite materials with ultraviolet rays to reduce Ag<+> to obtain the multiple magnetic mesoporous catalysts, wherein nanometer Ag is anchored on the surfaces of the catalysts. The catalysts have excellent properties of catalyzing and reducing 4-nitrophenol to 4-aminophenol and catalyzing styrene to be oxidized as phenyl ethylene oxide, and the catalysts have a favorable application prospect in heterogeneous catalysis oxidation and reduction reactions.

Description

technical field [0001] The invention relates to a preparation method and application of a multi-component magnetic mesoporous catalyst, in particular to a Fe 3 o 4 MOFSiO 2 The preparation method of Ag catalyst and the application of catalytic reduction of 4-nitrophenol to 4-aminophenol and catalytic oxidation of styrene to phenyloxirane belong to materials science, nanomaterials, metal organic complexes, chemical industry, catalysis, etc. technology field. Background technique [0002] Metal Organic Frameworks (MOFs), also known as metal-organic coordination polymers, are a new type of functionalized crystal materials. It is a crystalline material in which organic ligands connect inorganic metal ions or metal ion clusters through coordination bonds to form an infinitely extended network structure. MOFs neatly combine inorganic and organic chemistry, two chemical disciplines that are usually regarded as completely different. According to the extension of MOFs in the spa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/28C02F1/70C02F1/58C07D303/04C07D301/19
Inventor 王志玲崔玉杨小风郑鲁沂刘志莲
Owner UNIV OF JINAN
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