Method for preparing Pd/foamed metal catalyst for hydrogenolysis dechlorination

A foam metal and catalyst technology, which is applied in the field of preparation of palladium/foam metal catalyst, can solve the problems of high energy consumption, equipment cost, catalyst deactivation and the like, and achieves the effects of good stability, high degree of dispersion and good application prospect.

Active Publication Date: 2008-11-05
TSINGHUA UNIV
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  • Application Information

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Problems solved by technology

However, the gas-phase hydrodechlorination process is prone to catalyst deactivation caused by HCl poisoning, carbon deposition or sinter...

Method used

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  • Method for preparing Pd/foamed metal catalyst for hydrogenolysis dechlorination
  • Method for preparing Pd/foamed metal catalyst for hydrogenolysis dechlorination

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Embodiment 1: nickel foam supported palladium catalyst technology and dechlorination reaction process

[0022] Cut out the required size of nickel foam (99.9%, thickness 2.0mm, S BET : 1.2217±0.1296m 2 / g, pore density: 130ppi), load according to the following steps: (1) the foamed nickel sheet is cut into a small block of 2mm × 2mm size, and the foamed nickel small block of about 0.3g is weighed and put into the acetone solution, Ultrasonic for 40-60 minutes to degrease, take them all out and rinse them with clean water, then put them into 80g / L sulfuric acid solution and ultrasonically for 60-180s to remove the oxide layer, then wash and drain with clean water; (2) 0.3g of the present embodiment The initial size of nickel foam before cutting is 1.4×4.8cm 2 , the required palladium loading is 3.5mg / cm 2 (geometric size), thus calculate and prepare 22mL 10mMPdCl according to the load calculation formula 2 +30mMNaCl (molar ratio 1:3) deposition solution (i.e. chemica...

Embodiment 2

[0024] Embodiment 2: foam copper supported palladium catalyst technology and dechlorination reaction process

[0025] The catalyst preparation process and reaction performance evaluation conditions are the same as in Example 1, except that the carrier is made of foamed copper material, and the time for ultrasonically removing the oxide layer in 80g / L sulfuric acid solution is 30-40s. When the catalyst is used for hydrodechlorination of 4-chlorophenol, the conversion rate of chlorophenol after 20 minutes of reaction is 98.6%, which is slightly higher than the dechlorination efficiency of palladium / nickel foam.

Embodiment 3

[0026] Embodiment 3: foam iron supported palladium catalyst technology and dechlorination reaction process

[0027] The catalyst preparation process and reaction performance evaluation conditions are the same as in Example 1, except that the carrier is made of foamed iron material, and the time for ultrasonically removing the oxide layer in 80g / L sulfuric acid solution is 10-30s. When the catalyst is used for hydrodechlorination of 4-chlorophenol, the conversion rate of 4-chlorophenol is 92.1% after 20 minutes of reaction, which is slightly lower than the dechlorination efficiency of palladium / nickel foam.

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Abstract

The invention discloses a preparation method for a palladium/foamed metal catalyst used for hydrogenolysis and dechlorination, which pertains to the hydrogenolysis reduction technology and the technical field of the preparation of load type palladium catalysts. A foamed metal body is cut into a small block body of about 4mm<2>; a layer of oxide is removed by ultrasound of the solution of dilute sulphuric acid after an organic dissolvent is washed and carried out oil removing; the chemical plating liquor of palladium chloride is prepared; the clean carrier of the foamed metal is put in the chemical plating liquor for being carried out chemical plating; loading is finished and the carrier is taken out within 1 hour, and then washing with water and drying by air is carried out, thus obtaining the palladium/foamed metal catalyst. The catalyst is mainly used for the hydrogenation and the dechlorination of chlorinated organics in water, and dechlorination can be finished within 30min when chlorinated aromatic hydrocarbons goes through liquid phase hydrogenolysis reaction; therefore, the preparation method is applicable to rehabilitating environment with water polluted by the chlorinated organics. Since high temperature hydrogen reduction treatment is not required during the preparation process, the palladium particles formed by the catalyst has smaller particle diameter and higher dispersion degree; the activation of hydrogenation and dechlorination is stronger, thus having good application prospect.

Description

technical field [0001] The invention belongs to hydrogenolysis reduction technology and supported palladium catalyst preparation technology, mainly used for hydrogenolysis dechlorination process of chlorinated organic compounds, especially suitable for environmental restoration of water polluted by chlorinated organic compounds, specifically a hydrogenolysis dechlorination process The preparation method of the palladium / foam metal catalyst. Background technique [0002] Chlorinated organic compounds are important chemical raw materials and organic reagents, widely used in chemical, pesticide, paint, electric power, construction and other industries. With the mass production and use of chlorinated organic compounds, the pollution caused by their proliferation has posed a serious threat to human health and environmental ecology. For example: Many organochlorine pesticides (DDT, chlordane, toxaphene) as well as chlorobenzene and chlorophenol compounds have significant toxicity...

Claims

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Application Information

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IPC IPC(8): B01J23/89B01J35/10C02F1/70C02F101/30
Inventor 杨波余刚邓述波黄俊王姝
Owner TSINGHUA UNIV
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