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Method for preparing metal colloid at normal temperature

A metal colloid and metal precursor technology, applied in the direction of nanotechnology, can solve the problem of limited platinum sol, and achieve the effect of uniform distribution, small particle size and easy cleaning

Active Publication Date: 2012-09-19
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Various platinum colloids can be prepared by ethylene glycol night phase reduction method, and the prepared metal particles have the advantages of uniform distribution and small particles, but the platinum sol prepared by this method is quite limited, and there are some shortcomings: Langmuir, 2004, 20, 4241. report A method for preparing platinum sol by using sodium acetate as a protective agent under microwave heating and reflux conditions

Method used

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  • Method for preparing metal colloid at normal temperature
  • Method for preparing metal colloid at normal temperature

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1: chloroplatinic acid and sodium acetate are dissolved in ethylene glycol respectively, the concentration of chloroplatinic acid is 0.001mol / L, the concentration of sodium acetate is 0.005mol / L, and the molar ratio of sodium acetate and chloroplatinic acid is 5. Mix the solution of sodium acetate with the ethylene glycol solution of chloroplatinic acid, and react at room temperature for 4 hours. The color change during the reaction is: from light yellow to red to brown and finally to black, which proves that platinum ions are reduced to platinum metal , to generate platinum sol, the particle size of platinum is 4nm. figure 1 Middle a is the result of the TEM photo of the prepared platinum sol.

[0012] It can be seen from the figure that the particle diameter of the generated platinum metal is 4nm.

Embodiment 2

[0013] Embodiment 2: chloroplatinic acid and sodium acetate are dissolved in ethylene glycol respectively, the concentration of chloroplatinic acid is 0.001mol / L, the concentration of sodium acetate is 0.010mol / L, and the molar ratio of sodium acetate and chloroplatinic acid is 10. Mix the solution of sodium acetate with the ethylene glycol solution of chloroplatinic acid, and react at room temperature for 4 hours. The color change during the reaction is: from light yellow to red to brown and finally to black, generating platinum sol. The particle size of platinum 3.6nm. figure 1 Middle b is the result of the TEM photo of the prepared platinum sol. It can be seen from the figure that the particle diameter of the generated platinum metal is 3.6 nm.

Embodiment 3

[0014] Embodiment 3: chloroplatinic acid and sodium acetate are dissolved in ethylene glycol respectively, the concentration of chloroplatinic acid is 0.001mol / L, the concentration of sodium acetate is 0.035mol / L, and the molar ratio of sodium acetate and chloroplatinic acid is 35. Mix the sodium acetate solution with the chloroplatinic acid solution, and react at room temperature for 4 hours. The color changes during the reaction process: from light yellow to red to brown and finally to black, and a platinum sol is formed. The particle size of platinum is 2.8nm. figure 1 Middle c is the result of the TEM photo of the prepared platinum sol. It can be seen from the figure that the particle size of the generated platinum metal is 2.8nm.

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Abstract

The invention discloses a method for preparing a metal colloid at normal temperature, which belongs to the field of preparation of colloids. The method is characterized by comprising the following steps of: mixing a polyol solution with the concentration of a promoter of 0.00002-10mol / L and the polyol solution with the concentration of a metal precursor of 0.00001mol / L-1mol / L, enabling the molar ratio of the promoter to the metal precursor to be 2-100 and reacting at room temperature to prepare metal-sol, wherein the prepared metal-sol has ultrahigh stability, and the particle size of metal is 1-20nm. The metal-sol prepared by the method disclosed by the invention has good stability, and the particle size distribution of metal nanoparticles is uniform. The method disclosed by the invention has a simple process and is suitable for large-scale generation of the metal colloids, protecting agents on the surfaces of the generated nanoparticles are easy to clean, a catalyst prepared by the method disclosed by the invention has high activity, and the method further has good economic benefits and industrial application prospects.

Description

technical field [0001] The invention belongs to the technical field of colloid preparation and catalysis, and relates to a method for preparing metal colloid at normal temperature. Background technique [0002] Metal nanoparticles, as catalyst materials, are superior in their extremely high surface atom distribution and high specific surface area, a large number of surface atoms can be in contact with the substrate, and the charge distribution, coordination ability and geometric configuration of the surface metal atoms have a significant impact on Catalyst activity and selectivity also have a great influence. Therefore, nano-metal particles are expected to exhibit unique catalytic behavior, higher catalytic activity and selectivity. Although metal nanoparticles have many advantages, there are also many disadvantages, such as: because the particles are small, metal nanoparticles are unstable and easy to agglomerate, and in most cases, agglomeration will cause the particles t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B82Y40/00
Inventor 梁长海李闯陈霄肖子辉邵正锋
Owner DALIAN UNIV OF TECH
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