Unlock instant, AI-driven research and patent intelligence for your innovation.

New method for improving anti-sintering property of supported gold nanoparticles under bimetallic system

A gold nanoparticle and nanoparticle technology, applied in the field of preparation of nanocatalysts, can solve the problems of the original property change of the catalyst, the disadvantage of reducing the cost of the catalyst, the high price, etc., and achieve the effect of improving the anti-sintering effect.

Active Publication Date: 2013-08-21
ZHEJIANG UNIV
View PDF1 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the protective agent is wrapped on the surface of metal nanoparticles to form a confinement layer (shell)-a core-shell structure of nanoparticles, and the protective agent will inevitably occupy the active sites on the surface of nanoparticles, resulting in a decrease in catalyst activity.
The method of adding high-melting-point metals to form alloys is generally expensive due to the introduction of high-melting-point noble metals, which is unfavorable for reducing catalyst costs.
At the same time, a large amount of another noble metal is introduced, which will inevitably lead to changes in the original properties of the catalyst.

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
  • New method for improving anti-sintering property of supported gold nanoparticles under bimetallic system
  • New method for improving anti-sintering property of supported gold nanoparticles under bimetallic system
  • New method for improving anti-sintering property of supported gold nanoparticles under bimetallic system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: the synthesis of EP-FDU-12 with specific mesoporous structure

[0033] Example 1

[0034] Add 0.5g F127, 1.25g KCl to 50ml 1M HCl and stir until clear, add 0.7ml 1,3,5-trimethylbenzene and then add 4.46ml ethyl orthosilicate at 14 O C under reaction for 1 day, and then the reaction solution at 100 O C-220 O EP-FDU-12 carriers with different specific pore diameters and window sizes can be obtained by hydrothermal heating at C for 1 day, suction filtration and drying, and microwave digestion.

Embodiment 2

[0035] Embodiment 2: Preparation of monodisperse gold nanoparticles

[0036] Example 2

[0037] Dissolve 0.2g AuPPh3Cl in 20ml benzene, add 0.4ml dodecyl mercaptan, place at 70 O Stir in the C oil bath for 20 minutes until the solution is clear, add 47mgNaBH4 react for 3 hours, add 20ml ethanol and centrifuge and dry to obtain monodisperse gold nanoparticles (such as figure 1 ). It can be seen from the TEM images that the prepared gold nanoparticles have monodispersity and the size is about 3.3nm.

Embodiment 3

[0038] Embodiment 3: Preparation of monodisperse nano ruthenium particles

[0039] Example 3

[0040]Dissolve 0.02g RuCl3.3H2O in 25ml 1,2-propylene glycol solution, add an appropriate amount of sodium acetate trihydrate, stir evenly, the concentration of sodium acetate is about 4.0×10 -2 mol / l, placed at 170 O React in a C oil bath for 10 min, and cool to room temperature. Add excess ethanol and centrifuge at 4000r / min to obtain ruthenium nanoparticles, or extract with toluene (solvent)-thiol (protective agent) system. Characterized by TEM, single-sized ruthenium nanoparticles (such as figure 2 ).

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
sizeaaaaaaaaaa
sizeaaaaaaaaaa
sizeaaaaaaaaaa
Login to View More

Abstract

Belonging to the field of catalytic material preparation, the invention provides a new method for improving the anti-sintering property of supported gold nanoparticles under a bimetallic system. The biggest problem for industrial application of a metallic nanocatalyst is that occurrence of sintering under severe reaction conditions of high temperature and high pressure, etc., can degrade the catalytic performance of the metallic nanocatalyst. In the invention, uniform gold nanoparticles are supported in super large cage mesoporous pore canals. With an extremely trace amount of nanometer ruthenium particles (less than 1wt%) supported, the anti-sintering property of the gold nanoparticles can be improved, and no severe sintering phenomenon occurs in a heat treatment of the catalyst at a temperature of 700DEG C. The method of the invention is characterized in that: 1) the carrier employed in the invention is an EP-FDU-12 mesoporous molecular sieve with a specific mesoporous structure; 2)an adsorbed gold catalyst with extremely low ruthenium loading (such as about 0.04wt%) can, at a constant temperature of 700DEG C, play a role in stabilizing the gold nanoparticles (over 4wt%) and preventing the gold nanoparticles from sintering.

Description

technical field [0001] The invention belongs to the field of preparation of nanometer catalysts, and in particular provides a method for simply preparing a loaded gold catalyst with high-temperature anti-sintering performance. technical background [0002] In recent years, nanometal materials with tunable size and composition have had an important impact in the field of heterogeneous catalysis. Nevertheless, the lack of thermal stability of such materials has greatly hindered their application in practical industrial catalysis. Some recent research progress mainly focuses on stabilizing nano-metal particles by wrapping protective agents on the surface of nano-metal particles or adding high-melting point metals to form alloys. However, the protective agent is wrapped on the surface of the metal nanoparticles to form a confinement layer (shell)-nanoparticle core-shell structure, and the protective agent will inevitably occupy the active sites on the surface of the nanoparticl...

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): B01J29/03
Inventor 范杰靳加彬
Owner ZHEJIANG UNIV