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Preparation method of core-shell Fe/Pd bimetallic nano-catalyst

A bimetallic, core-shell type technology, applied in the direction of catalyst activation/preparation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc. High production cost and other issues, to achieve good dechlorination effect, high electron transport performance, and easy operation

Inactive Publication Date: 2010-02-10
SHANDONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the production cost of the solid phase reduction method is lower, the precursor treatment is more troublesome, and for the liquid phase reduction method, the production cost is higher due to the high price of the reducing agent.

Method used

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  • Preparation method of core-shell Fe/Pd bimetallic nano-catalyst
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  • Preparation method of core-shell Fe/Pd bimetallic nano-catalyst

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Effect test

Embodiment 1

[0028] The preparation method of core-shell type nano bimetallic Fe / Pd catalyst:

[0029] First polish the glassy carbon electrode with 3500# metallographic sandpaper, and then polish the mirror surface of the paper with 0.5μm alumina powder. Before the experiment started, the glassy carbon electrode was first placed in HNO 3 Solution (HNO 3 :H 2 (O volume ratio 1:1) ultrasonic 5min, and then rinse with ultrapure water. The electrochemical experiments were all carried out in the electrolytic cell of the traditional three-electrode system: a clean glassy carbon electrode was used as the working electrode, a Pt sheet was used as the counter electrode, and a saturated calomel electrode was used as the reference electrode.

[0030] NaCl and FeCl 2 The mixed solution of NaCl is used as the deposition solution, and the concentration of NaCl is 0.25mol dm -3 , FeCl 2 The concentration is 10mmol dm -3 , control the temperature at 30°C, and deposit a large amount of Fe on the gl...

Embodiment 2

[0033] The preparation method of core-shell type nano bimetallic Fe / Pd catalyst:

[0034] First polish the glassy carbon electrode with 3500# metallographic sandpaper, and then polish the mirror surface of the paper with 0.5μm alumina powder. Before the experiment started, the glassy carbon electrode was first placed in HNO 3 (HNO 3 :H 2 (O volume ratio 1:1) ultrasonic 5min, and then rinse with ultrapure water. The electrochemical experiments were all carried out in the electrolytic cell of the traditional three-electrode system: a clean glassy carbon electrode was used as the working electrode, a Pt sheet was used as the counter electrode, and a saturated calomel electrode was used as the reference electrode.

[0035] NaCl and FeCl 2 The mixed solution of NaCl is used as the deposition solution, and the concentration of NaCl is 0.25mol dm -3 , FeCl 2 The concentration is 10mmol dm -3 , control the temperature at 30°C, and deposit a large amount of Fe on the glassy carb...

Embodiment 3

[0038] The core-shell type nano-bimetallic Fe / Pd catalyst that embodiment 1 makes is respectively in 0.5mol dm -3 h 2 SO 4 and 0.5moldm -3 h 2 SO 4 +30mg dm -3 CCl 4 A voltammetric scan was performed, with the addition of CCl by contrast 4 The cyclic voltammetry curves before and after in sulfuric acid solution found that adding CCl 4 After, due to CCl 4 The adsorption of molecules on the surface of the electrode occupies the active sites of hydrogen adsorption, so that the peaks of hydrogen adsorption and oxidation at positive potentials disappear, and the peaks of hydrogen formation and desorption at negative potentials decrease, such as image 3 shown.

[0039] According to the different forms of hydrogen on Pd at different potentials, that is, the difference in hydrogen activity at different potentials, at 0.5moldm -3 h 2 SO 4 with 30mg dm -3 CCl 4 In the mixed solution, by changing the constant potential electrolysis potential (dechlorination time is 30min, ...

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Abstract

The invention discloses a preparation method of a core-shell Fe / Pd bimetallic nano-catalyst. In the preparation method, glassy carbon electrodes are used as working electrodes, nano-Fe is firstly deposited on the electrodes by an electrochemical deposition method, then the nano-Fe is dipped into a certain quantity of palladium chloride ion solutions for appropriate time so that the noble metal ions and the nano-Fe are partially replaced, and then residual liquid on the surfaces of the electrodes is washed out. The method has simple steps and is easily operated and can conveniently control theload and the appearance of the Fe deposited on the surfaces of the glassy carbon electrodes by controlling the growth time of finished core-core and the concentration of Fe ions in deposit liquid. Theprepared core-shell Fe / Pd bimetallic nano-catalyst has high catalytic activity and favorable effect on dechlorination for contaminants such as organic chloro compounds, and the like.

Description

technical field [0001] The invention relates to a preparation method of a core-shell nanometer bimetallic Fe / Pd catalyst, in particular to the electrochemical synthesis of a cubic configuration Fe, and the bimetal can be used as an electrocatalyst for efficient dechlorination of organic chlorinated substances. Background technique [0002] Organic chlorinated compounds (such as carbon tetrachloride, etc.) are common organic pollutants in environmental water. Such pollutants are highly toxic and stable in chemical properties. Once they enter the environmental water body, they will pose a long-term threat to human beings and their ecological environment. In recent years, the impact of organic chlorides on the environment and health has attracted increasing global attention, and its degradation treatment technology has also attracted widespread attention at home and abroad. One of the most studied simple, effective and cheap treatment methods is the dechlorination of metallic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/89B01J37/34B01J35/02C02F1/58C02F101/36
Inventor 黄理辉马厚义邱翠翠李文静孙国鹏
Owner SHANDONG UNIV
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