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A kind of sandwich structure nano catalytic material and preparation method thereof

A nano-catalytic material and sandwich technology, applied in the field of sandwich-structured nano-catalytic materials and their preparation, can solve the problems of unfavorable force, single performance, unfavorable stability of precious metal nanoparticles, etc. The effect of excellent magnetic recovery performance

Active Publication Date: 2018-08-17
南京工大环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the oxides in core-shell noble metal nanocatalysts are often single-phase oxides with single performance, which is not conducive to improving the interaction between them and noble metals; while the constructed multi-element composite oxides and noble metal nanocatalytic material-supported catalysts, composite Oxide will agglomerate and sinter during heating pretreatment and catalytic reaction, which is not conducive to the stability of noble metal nanoparticles

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] S1. At room temperature, add 100g of 2wt% ferrous chloride aqueous solution into the reactor, add 2g of ferric chloride hexahydrate and 4g of polyethylene glycol, raise the temperature of the solution to 60°C, stir for 0.5h, and adjust with ammonia water When the pH of the system reaches 10, continue to stir for 1 h, magnetically separate, wash the precipitate with water, and obtain magnetic Fe 3 o 4 nanospheres;

[0025] S2, get the Fe that 1g makes 3 o 4 Add nanometer microspheres into 40mL deionized water, ultrasonically disperse for 0.5h, add 0.04g of chloroauric acid, stir for 1h, add 2g of reducing agent, stir, raise the solution temperature to 80°C, react for 1.5h, magnetically separate, precipitate and wash with water, Redisperse in 20mL deionized water to prepare magnetic gold composite microsphere solution;

[0026] S3. At room temperature, add 0.1g tetraethyl orthosilicate and 15mL ethanol to another reactor to prepare an organosilicon alcohol mixture, ad...

Embodiment 2

[0031] S1. At room temperature, add 100g of 2wt% ferrous chloride aqueous solution into the reactor, add 3g of ferric chloride hexahydrate and 3g of polyethylene glycol, raise the temperature of the solution to 70°C, stir for 1h, and adjust the system with ammonia water pH to 11, continue to stir for 1h, magnetically separate, wash the precipitate with water, and obtain magnetic Fe 3 o 4 nanospheres;

[0032] S2, get the Fe that 1g makes 3 o 4 Add nanometer microspheres into 40mL deionized water, ultrasonically disperse for 1h, add 0.02g of palladium chloride, stir for 0.5h, add 1g of reducing agent, stir, raise the solution temperature to 80°C, react for 2h, magnetically separate, wash the precipitate with water, re- Disperse in 20mL deionized water to prepare a magnetic gold composite microsphere solution;

[0033] S3. At room temperature, take another reactor, add 0.1g triisopropyltriethoxysilane and 20mL ethanol to prepare an organosilanol mixture, add 0.15g tetrabutyl...

Embodiment 3

[0038] S1. At room temperature, add 100g of 4wt% ferrous chloride aqueous solution into the reactor, add 2g of ferric chloride hexahydrate and 5g of polyethylene glycol, raise the temperature of the solution to 60°C, stir for 0.5h, adjust with ammonia water When the pH of the system reaches 10, continue to stir for 1 h, magnetically separate, wash the precipitate with water, and obtain magnetic Fe 3 o 4 nanospheres;

[0039] S2, get the Fe that 1g makes 3 o 4 Add nanometer microspheres into 40mL deionized water, ultrasonically disperse for 0.5h, add 0.05g of chloroauric acid, stir for 1h, add 3g of reducing agent, stir, raise the solution temperature to 90°C, react for 2h, magnetically separate, precipitate and wash with water, re- Disperse in 20mL deionized water to prepare a magnetic gold composite microsphere solution;

[0040] S3. At room temperature, take another reactor, add 0.15g tetraethyl orthosilicate and 20mL ethanol to configure organosilicone mixture, add 0.50...

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Abstract

The invention discloses a sandwich structure nano-catalytic material. The core of the material is magnetic Fe3O4 nanospheres, the intermediate phase is nano-noble metal particles selected from Au, Pd and Pt, and the outer shell is cerium-titanium composite oxide. The invention also provides a method for preparing the nanocatalytic material, which sequentially prepares magnetic Fe3O4 nanomicrospheres, magnetic noble metal composite microsphere solutions, magnetic noble metal composite amorphous cerium titanium silicon materials, and magnetic noble metal composite crystalline cerium titanium silicon materials. Finally, SiO2 is removed through alkaline solution, separated, washed, and dried to obtain a nanocatalytic material with strong catalytic activity, high thermal stability, and excellent magnetic recovery performance. The pores in the outer oxide shell of the material can promote Full contact between the reactants and the active precious metal layer. This material has excellent application prospects in biological targeted therapy, optical nanodevices, water gas shift, olefin gas phase epoxidation, etc.

Description

technical field [0001] The invention belongs to the technical field of nano-catalysis composite materials, and in particular relates to a sandwich-structure nano-catalysis material and a preparation method thereof. Background technique [0002] In recent years, with the development of nanoscience and technology, nanomaterials have received widespread attention. Because nanoparticles have the advantages of small particle size and large specific surface area, nanomaterials often show high catalytic activity when used as catalysts, and thus have been widely used in the catalytic industry. [0003] Chinese patent document CN201210236102.4 discloses a preparation method of gold magnetic nanoparticles with a three-layer core-shell structure, which uses self-assembly technology, seed growth method and colloidal reduction chemical method to prepare a three-layer core-shell structure coated with a complete gold shell. gold magnetic nanoparticles Fe 3 o 4 @SiO 2 @Au. Chinese pate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89
CPCB01J23/894B01J35/50B01J35/40B01J35/33
Inventor 张泽武张京徽黄月陈浩李酉倪钰惠熊欣韩希思
Owner 南京工大环保科技有限公司
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