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Preparation method of platinum-palladium alloy nanocrystalline

A technology of platinum-palladium alloy and nanocrystal, which is applied in the field of preparation of precious metal nanomaterials, can solve the problems of complex process, high cost and low output, and achieve the effect of simple preparation method, simple reagent and good dispersibility

Active Publication Date: 2014-03-26
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method is relatively complicated in technology, high in cost and low in output.

Method used

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  • Preparation method of platinum-palladium alloy nanocrystalline

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Embodiment 1

[0027] Dissolve 99 mg of chloroplatinic acid and 72 mg of sodium tetrachloropalladate in 4 mL of ethylene glycol (the concentration of chloroplatinic acid is 0.06 mol / L, and that of sodium tetrachloropalladate is 0.06 mol / L), while 199 mg of polyvinylpyrrolidone, 200 mg Add ascorbic acid and 150mg potassium bromide to 6ml of ethylene glycol (polyvinylpyrrolidone concentration is 0.3mol / L, ascorbic acid concentration is 0.19mol / L, potassium bromide concentration is 0.21mol / L). Then place 6mL mixed solution of polyvinylpyrrolidone, ascorbic acid, potassium bromide and ethylene glycol in a heater, heat to 130°C while stirring, and inject chloroplatinic acid, tetrachloromethane at a rate of 2mL / h with a syringe pump. 3 mL of a mixed solution of sodium palladium and ethylene glycol was injected into a mixed solution of polyvinylpyrrolidone, ascorbic acid, potassium bromide, and ethylene glycol. When the mixed solution is completely injected, the reaction ends, and platinum-palladiu...

Embodiment 2

[0030] Dissolve 66 mg of chloroplatinic acid and 48 mg of sodium tetrachloropalladate in 4 mL of ethylene glycol (the concentration of chloroplatinic acid is 0.04 mol / L, and that of sodium tetrachloropalladate is 0.04 mol / L), while 199 mg of polyvinylpyrrolidone, 300 mg of Ascorbic acid and 100 mg of potassium bromide were added to 6 ml of ethylene glycol (the concentration of polyvinylpyrrolidone was 0.3 mol / L, the concentration of ascorbic acid was 0.28 mol / L, and the concentration of potassium bromide was 0.14 mol / L). Then place 6mL mixed solution of polyvinylpyrrolidone, ascorbic acid, potassium bromide and ethylene glycol in a heater, heat to 130°C while stirring, and inject chloroplatinic acid, tetrachloromethane at a rate of 3mL / h with a syringe pump. 3 mL of a mixed solution of sodium palladium and ethylene glycol was injected into a mixed solution of polyvinylpyrrolidone, ascorbic acid, potassium bromide, and ethylene glycol. When the mixed solution was fully injected...

Embodiment 3

[0032] Dissolve 132mg of chloroplatinic acid and 24mg of sodium tetrachloropalladate in 4mL of ethylene glycol (the concentration of chloroplatinic acid is 0.08mol / L, and the concentration of sodium tetrachloropalladate is 0.02mol / L), while 199mg of polyvinylpyrrolidone, 400mg Ascorbic acid and 100 mg of potassium bromide were added to 6 ml of ethylene glycol (the concentration of polyvinylpyrrolidone was 0.3 mol / L, the concentration of ascorbic acid was 0.38 mol / L, and the concentration of potassium bromide was 0.14 mol / L). Then place 6mL mixed solution of polyvinylpyrrolidone, ascorbic acid, potassium bromide and ethylene glycol in a heater, heat to 120°C while stirring, and inject chloroplatinic acid, tetrachloromethane at a speed of 4mL / h with a syringe pump 3 mL of a mixed solution of sodium palladium and ethylene glycol was injected into a mixed solution of polyvinylpyrrolidone, ascorbic acid, potassium bromide, and ethylene glycol. When the mixed solution was completely...

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Abstract

The invention discloses a preparation method of platinum-palladium alloy nanocrystalline. The preparation method comprises the following steps: dissolving chloroplatinic acid and sodium tetrachloropalladate into ethylene glycol to obtain a mixed solution I; dissolving polyvinylpyrrolidone, ascorbic acid and potassium bromide into ethylene glycol to obtain a mixed solution II; heating the mixed solution II to 100-150 DEG C while continuously stirring, and adding the mixed solution I into the mixed solution II to obtain the platinum-palladium alloy nanocrystalline, wherein the molar concentration of the potassium bromide is 0.1-0.4 mol / L. By the preparation method, the platinum-palladium alloy nanocrystalline with a concave hexahedral shape can be prepared by one step; reagents used in the preparation method are relatively simple and non-toxic and harmless; the preparation method is simple, and easy to implement; the prepared platinum-palladium alloy nanocrystalline has the concave hexahedral shape and has the characteristics of high-index crystal surface exposure, uniform particle size, and controllable components.

Description

technical field [0001] The invention relates to the field of preparation of noble metal nanomaterials, in particular to a method for preparing platinum-palladium alloy nanocrystals. Background technique [0002] Platinum-based alloy nanocrystals have been widely used in hydrogenation reactions, fuel cells, and petroleum cracking due to their high reactivity. Among many platinum-based synthetic nanocrystals, platinum-palladium alloy nanocrystals have been widely studied because of their advantages in the following three aspects: [0003] (1) Both platinum and palladium are metals with a face-centered cubic structure, and the difference in lattice constant between the two is only 0.77%, so the two are easier to form a uniform alloy; [0004] (2) Palladium is also a noble metal with superior catalytic performance. When platinum and palladium form an alloy, the coupling effect between metals can improve the catalytic performance; [0005] (3) Compared with platinum, the price ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/66C30B29/52C30B7/14B82Y40/00
Inventor 张辉占方伟杨德仁
Owner ZHEJIANG UNIV
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