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Preparation method, preservation method and application for rhodium-palladium alloy

A technology of palladium alloy and palladium salt, which is applied in the field of preparation of rhodium-palladium alloy, to achieve the effect of facilitating electron transmission, improving electron transmission performance, and good conductivity

Active Publication Date: 2018-08-24
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As far as we know, the application of rhodium-palladium alloys in catalyzing the HDF reaction has not been reported in the literature.

Method used

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  • Preparation method, preservation method and application for rhodium-palladium alloy
  • Preparation method, preservation method and application for rhodium-palladium alloy
  • Preparation method, preservation method and application for rhodium-palladium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Add RhCl to the same aqueous solution system at 30°C under air atmosphere 3 To a concentration of 1 mM, add PdCl 2 At the same time, the supporting electrolyte NaCl was added to a concentration of 1 M, and the pH was adjusted to 2 with concentrated hydrochloric acid. Nickel foam was used as the substrate material, and the aqueous solution system was stirred, and a rhodium-palladium alloy was obtained by electrodepositing at a current of 4 mA.

[0050] The foamed nickel needs to be pretreated as follows: first place the foamed nickel in acetone for 20 minutes of ultrasonic treatment for degreasing and cleaning; then in 80g / L dilute H 2 SO 4 Soak in the solution for 5 minutes to remove the oxide layer on the surface of the material; then wash it with deionized water until it is clean.

Embodiment 2

[0052] Add RhCl to the same aqueous solution system at 10°C under air atmosphere 3 To a concentration of 0.5 mM, add PdCl 2 At the same time, the supporting electrolyte KCl was added to a concentration of 0.6 M, and the pH was adjusted to 1.8 with concentrated hydrochloric acid. Nickel foam was used as the base material, and the aqueous solution system was stirred, and a rhodium-palladium alloy was obtained by electrodepositing at a current of 3 mA.

[0053] The nickel foam needs to be pretreated as follows: first place the nickel foam in acetone for 5 minutes of ultrasonic treatment for degreasing and cleaning, repeat three times; then in 75g / L dilute H 2 SO 4 Soak in the solution for 2 minutes to remove the oxide layer on the surface of the material; then wash it with deionized water until it is clean.

Embodiment 3

[0055] Add RhCl to the same aqueous solution system at 50°C under air atmosphere 3 To a concentration of 2 mM, add PdCl 2 At the same time, the supporting electrolyte NaCl was added to a concentration of 1.8 M, and the pH was adjusted to 2.4 with concentrated hydrochloric acid. Nickel foam was used as the base material, and the aqueous solution system was stirred, and a rhodium-palladium alloy was obtained by co-electrodeposition at a current of 10 mA.

[0056] The foamed nickel needs to be pretreated as follows: first place the foamed nickel in acetone for 60 minutes of ultrasonic treatment for degreasing and cleaning; then in 85g / L dilute H 2 SO 4 Soak in the solution for 20 minutes to remove the oxide layer on the surface of the material; then wash it with deionized water until it is clean.

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PUM

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Abstract

The invention discloses a preparation method for a rhodium-palladium alloy. The preparation method comprises the following step: performing electro-co-deposition by using a rhodium salt as a rhodium source and a palladium salt as a palladium source in a same aqueous solution system to obtain the rhodium-palladium alloy. At the same time, the invention discloses a preservation method for the rhodium-palladium alloy prepared by the above method; and the preservation method comprises the following step: placing the rhodium-palladium alloy obtained by the electro-co-deposition into ethanol or kerosene for preservation. At the same time, the invention discloses an application of the rhodium-palladium alloy prepared by the above preparation method in catalysis of hydrogenation defluorization ofa fluorinated aromatic compound. The preparation method disclosed by the invention can realize rapid and precise regulation and control of a reaction rate; the preservation method disclosed by the invention facilitates prevention of oxidation of the rhodium-palladium alloy and long-term storage; when the rhodium-palladium alloy prepared by the preparation method is applied to the catalysis of thehydrogenation defluorization of the fluorinated aromatic compound, a using amount of a catalyst is greatly reduced, time of a catalytic reaction is shortened, degradation efficiency of the fluorinatedaromatic compound is improved, and discharge of fluorinated aromatic pollutants is reduced; and the rhodium-palladium alloy is environmentally friendly.

Description

technical field [0001] The invention relates to the technical field of composite materials, in particular to a preparation method, preservation method and application of a rhodium-palladium alloy. Background technique [0002] Rhodium-palladium alloys have attracted increasing attention because of their excellent and special properties. [0003] At present, the preparation method of rhodium-palladium alloy is mainly chemical method. A preparation method of rhodium-palladium alloy nanocrystals is disclosed in the Chinese invention patent authorization announcement specification CN103658673 B. Sodium hexachlororhodate and sodium tetrachloropalladate are dissolved in ethylene glycol to obtain mixed solution I, and polyvinylpyrrolidone, Ascorbic acid and potassium bromide are dissolved in ethylene glycol to obtain a mixed solution II; the mixed solution II is heated to 80-160°C, and then the mixed solution I is added dropwise to the mixed solution II at a rate of 1-6mL / h to obt...

Claims

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Application Information

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IPC IPC(8): B01J23/46B01J23/89B01J37/34C25B3/00C25B11/08C25C1/24
CPCC25B3/00C25C1/24B01J23/464B01J23/892B01J37/348C25B11/097B01J35/33Y02P10/20
Inventor 徐颖华张小勇葛婷婕刘奇丁旭芬姚则庆郭利巧
Owner ZHEJIANG UNIV OF TECH
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