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A palladium-silver bimetallic composite material and a preparing method thereof

A composite material and bimetal technology, which is applied in the field of palladium-silver bimetal composite materials and its preparation, can solve the problems of low palladium activity and difficult electrochemical desorption

Active Publication Date: 2017-07-04
UNIV OF SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, the electrochemical hydrogen evolution reaction plays an important role in sustainable hydrogen energy utilization, but it is difficult for the adsorbed hydrogen atoms to be electrochemically desorbed from the surface of palladium, making palladium 30-50 times less active than the noble metal platinum in the electrochemical hydrogen evolution reaction. times

Method used

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  • A palladium-silver bimetallic composite material and a preparing method thereof
  • A palladium-silver bimetallic composite material and a preparing method thereof
  • A palladium-silver bimetallic composite material and a preparing method thereof

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preparation example Construction

[0035] The application also provides the preparation method of above-mentioned palladium-silver bimetallic catalyst, comprising:

[0036] Silver nanocrystals, reducing agent, etchant, surface protection agent, solvent and palladium source compound are mixed and then reacted to obtain palladium-silver bimetal composite material.

[0037] In the process of preparing the palladium-silver bimetallic composite material, the application utilizes etchant, reducing agent and surface protection agent to make the palladium-silver bimetallic composite material prepared have silver nanoparticles as the core and a palladium-silver alloy layer as the core. Composite material for the shell.

[0038] In the process of preparing the palladium-silver bimetallic composite material, the present application mixes silver nanocrystals, reducing agent, etchant, surface protection agent, solvent and palladium source compound and reacts to obtain the palladium-silver bimetallic composite material; In ...

Embodiment 1

[0048] The preparation of embodiment 1 silver nanocrystal

[0049] Add 50 milliliters of ethylene glycol into a 250 milliliter round-bottomed flask, heat the oil bath to 150 degrees Celsius and keep the temperature, while stirring at a constant speed with a magnet; quickly add 0.6 milliliters of 3 millimoles per liter of sodium hydrosulfide ethylene glycol solution, After 4 minutes, add 5 ml of 1 mol per liter hydrochloric acid aqueous solution, and after another 2 minutes, add 12.5 ml of 20 mg per ml of polyvinylpyrrolidone glycol solution, and after another 2 minutes, add 4 ml of 282 mmol per liter of tris Silver fluoroacetate ethylene glycol solution; keep the reaction mixed solution obtained above at 150 degrees Celsius for one hour under constant speed stirring; then wash out the sample with acetone and ethanol, and disperse it in a 10 ml centrifuge tube with water to obtain silver nanocrystals. The TEM photograph of the silver nanocrystal that present embodiment obtains ...

Embodiment 2

[0052] Mix 0.5mL oleylamine, 1mL 2mol / L hydrochloric acid aqueous solution, 0.03g ascorbic acid and 3.5mL ethylene glycol, heat in an oil bath at 80°C, and stir at a constant speed on a magnet; after preheating for 5 minutes, add 1mL containing 3mg palladium chloride Potassium acid potassium solution and 1mL silver nanocrystal solution, stir at constant speed 20min, wash out sample with n-hexanol subsequently, obtain palladium-silver bimetallic composite material; The TEM photo of the palladium-silver bimetallic composite material prepared in the present embodiment is as follows figure 2 as shown, figure 2 The scale bar is 50nm. image 3 Ordinary TEM and high-resolution TEM photographs of the palladium-silver bimetallic composite material prepared for Example 2 of the present invention, by image 3 It can be seen that the palladium-silver bimetallic composite material obtained in this example has a complete structure, and the internal silver nanoparticles are not damaged. A...

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Abstract

A palladium-silver bimetallic composite material is provided. The composite material includes silver nanometer crystals and a palladium-silver alloy layer on the surface of the silver nanometer crystals. The invention also provides a preparing method of the composite material. The preparing method includes mixing the silver nanometer crystals, a reductant, an etching agent, a surface protectant, a solvent and a palladium source compound, and then reacting the mixture to obtain the composite material. The nanometer crystals having a core shell structure are prepared by a provided synthetic method. Dispersed palladium atoms grow on the surfaces of the silver nanometer crystals, thus effectively weakening strength of palladium-hydrogen bonds and facilitating hydrogen desorption. In addition, low-cost silver nanometer particles are adopted inside the composite material, and palladium active points are distributed on the surfaces of the silver nanometer crystals, and therefore the activity of the composite material as a catalyst is high and the cost is low.

Description

technical field [0001] The invention relates to the technical field of metal catalysts, in particular to a palladium-silver bimetallic composite material and a preparation method thereof. Background technique [0002] Catalysts are one of the most common substances in chemical reactions. Almost all noble metals can be used as catalysts, but platinum, palladium, rhodium, silver and ruthenium are commonly used, among which platinum, rhodium and palladium are the most widely used. The d electron orbitals of the above noble metals are not filled, the surface is easy to adsorb reactants, and the strength is moderate, which is conducive to the formation of intermediate "active compounds", has high catalytic activity, and also has comprehensive excellent properties such as high temperature resistance, oxidation resistance, and corrosion resistance. , thus becoming the most important catalyst material. Among them, palladium-based catalytic systems based on nanomaterials have been ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/50B01J23/44
CPCB01J23/44B01J23/50B01J35/393
Inventor 熊宇杰李亚萍龙冉
Owner UNIV OF SCI & TECH OF CHINA
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