Method for preparing highly disperse supported noble metal nanoparticles

A nanoparticle, precious metal technology, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc. The effect of avoiding organic pollution

Active Publication Date: 2014-04-16
TSINGHUA UNIV
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for preparing highly dispersed and loaded noble metal nanoparticles, which solves the problems of complex preparation process, high pollution and high energy consumption of noble metal nanoparticles

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing highly disperse supported noble metal nanoparticles
  • Method for preparing highly disperse supported noble metal nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take 1.5 g of porous glass microspheres with a core-shell structure particle size of 95-105 μm etched by subcritical water (at a temperature of 300° C. and a pressure of 10 MPa) and mix them with palladium chloride-ethanol solution with an initial concentration of 100 ppm. And stirred in a constant temperature water bath at 20°C for 24h. The color of the porous glass microspheres gradually changed from white to gray. After the adsorption reached equilibrium, the glass microspheres loaded with nano-palladium were taken out and washed 5 times with dehydrated ethanol to remove the ions on the surface of the material. Then place it in an oven and dry to obtain loaded palladium nanoparticles. figure 2 (a) and (b) are transmission photographs of samples obtained in this example.

Embodiment 2

[0026] Take 3.0 g of porous glass microspheres with a core-shell structure particle size of 95-105 μm etched by subcritical water (at a temperature of 300° C. and at a pressure of 10 MPa) and mix them with a silver nitrate-ethanol solution with an initial concentration of 600 ppm, and Stir in a constant temperature water bath at 30°C for 30h. The color of the glass microspheres gradually changed from white to gray. After the adsorption reached equilibrium, the glass microspheres loaded with nano-silver were taken out and washed 4 times with dehydrated ethanol to remove the ions on the surface of the material. Then place in an oven and dry to obtain loaded silver nanoparticles. figure 2 (c) and (d) are transmission photos of the samples obtained in this example.

Embodiment 3

[0028] Take 1.0 g of porous glass microspheres with a core-shell structure particle size of 95-105 μm etched by subcritical water (at a temperature of 300° C. and a pressure of 10 MPa) and mix them with gold chloride-ethanol solution with an initial concentration of 50 ppm. And stirred in a constant temperature water bath at 50°C for 5h. The color of the glass microspheres gradually changed from white to pink. After the adsorption reached equilibrium, the glass microspheres loaded with nano-palladium were taken out and washed with dehydrated ethanol 10 times to remove ions on the surface of the material. Then place it in an oven and dry to obtain supported gold nanoparticles. figure 2 (e) and (f) are transmission photographs of samples obtained in this example.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
Login to view more

Abstract

The invention discloses a method for preparing highly disperse supported noble metal nanoparticles, belonging to the field of inorganic nanomaterials. The method is characterized in that porous glass microspheres which have nuclear-shell structures and are subjected to subcritical water etching are taken as carriers; target metal ions act on the carriers in the form of chemical bonds through the ion exchange technique; the acting force between the target metal ions and the carriers is powerful so that the aggregation of the metal ions is effectively avoided; therefore, the uniformity, high dispersibility and stability of the target metal supported on the porous glass microspheres are realized and bigger specific surface area under the same capacity is obtained; and finally, a catalyst loaded with nanometer metal particles is obtained. The preparation method disclosed by the invention is simple, low in pollution and low in power consumption.

Description

technical field [0001] The invention belongs to the field of inorganic nanometer materials, in particular to a method for preparing highly dispersed and loaded noble metal nanoparticles. Background technique [0002] Metal nanoparticles are widely used in optical materials, separation, catalysis and other fields due to their large specific surface area and special surface properties. Especially in the field of catalysis, it has attracted the attention of researchers because of its higher catalytic activity due to more defects and active sites than bulk metals. [0003] In chemical production, elements such as transition metals Pd, Ag, and Au are commonly used catalysts, which have shown good performance for hydrogenation, oxidation, dehydrogenation, and hydrolysis reactions. The preparation of highly dispersed supported metal nanoparticles is one of the research hotspots in the field of heterogeneous catalysis [1-2] . [0004] However, it is precisely because of the high ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/50B01J23/52B01J23/44B01J35/08B01J37/30
Inventor 王玉军申春骆广生王凯
Owner TSINGHUA UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap