Sandwich-structured nanometer 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 noble metal nanoparticles stability, single performance, unfavorable force, etc., achieve excellent magnetic recovery performance, strong catalytic activity, prevent The effect of too fast crystallization

Active Publication Date: 2017-01-25
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-structured nanometer catalytic material. The sandwich-structured nanometer catalytic material is characterized by taking magnetic Fe3O4 nanospheres as a core, nanometer noble-metal particles as an intermediate phase and cerium-titanium composite oxides as a shell, and the nanometer noble-metal particles are selected from one of Au, Pd and Pt. The invention further provides a preparation method of the sandwich-structured nanometer catalytic material. The preparation method includes sequentially preparing the magnetic Fe3O4 nanospheres, a magnetic noble-metal composite microsphere solution, a magnetic noble-metal composite noncrystalline cerium-titanium-silicon material and a magnetic noble-metal composite crystalline cerium-titanium-silicon material, removing SiO2 through an alkali liquor, separating, washing and drying so as to obtain the sandwich-structured nanometer catalytic material high in catalysis activity and thermostability and excellent in magnetic reclaim performance. Reactants can be in full contact with activated noble metal layers through porous passages in the outer oxide shell. The sandwich-structured nanometer catalytic material has a promising application prospect in the fields of biological target therapy, optical nanometer devices, water-gas shift and olefin gas-phase epoxidation.

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 Applications(China)
IPC IPC(8): B01J23/89
CPCB01J23/894B01J35/0033B01J35/023B01J35/026
Inventor 张京徽张泽武黄月陈浩李酉倪钰慧熊欣韩希思
Owner 南京工大环保科技有限公司
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