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Method for preparing platinum-carbon catalyst

A platinum-carbon catalyst, platinum compound technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. Short service life and other problems, to achieve the effect of long service life, high catalytic activity, and improved service life

Active Publication Date: 2015-05-27
陕西瑞科新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method for preparing a platinum-carbon catalyst, which solves the technical problems of low catalytic activity and short service life caused by insufficient platinum adhesion on the surface of carrier carbon and low dispersion in the prior art.

Method used

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  • Method for preparing platinum-carbon catalyst
  • Method for preparing platinum-carbon catalyst

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preparation example Construction

[0023] A kind of preparation method of platinum carbon catalyst of the present invention comprises the following steps:

[0024] Step 1: Modification of activated carbon support:

[0025] 1.1, the particle size is 200-300 mesh, the specific surface area is 800-1200m 2 / g, the activated carbon whose average pore radius is greater than 1.5nm is refluxed with a nitric acid solution with a concentration of 1%-10% for 1h-3h, and then the activated carbon after the reflux treatment is washed with deionized water until the pH of the washing liquid is 6-7, and dried , to obtain pretreated activated carbon carrier;

[0026] 1.2. Soak the pretreated activated carbon carrier in an aqueous surfactant solution with a concentration of 0.1-1.0%, stir for 1-3 hours to make it mix evenly and reach adsorption equilibrium, and obtain a modified activated carbon suspension;

[0027] Step 2: Preparation of platinum precursor solution:

[0028] Weigh the platinum-containing compound, add deioniz...

Embodiment 1

[0037] The particle size is 200 mesh, the specific surface area is 800m 2 / g, the activated carbon with an average pore radius of 2nm is placed in a boiling mass concentration of 1% nitric acid solution for reflux treatment for 1h, then the activated carbon after the reflux treatment is washed with deionized water until the pH of the washing solution is 7, and dried to obtain pretreatment The activated carbon carrier; soak the pretreated activated carbon carrier in a stearic acid aqueous solution with a mass concentration of 0.1%, stir for 3 hours to make it mix evenly and reach adsorption equilibrium, and obtain the modified activated carbon suspension;

[0038] Weigh platinum nitrate, add deionized water to dilute to a platinum concentration of 5g / L, and adjust the pH to 3 with hydrochloric acid under stirring to obtain a platinum precursor solution; the platinum precursor solution is added to the modified In the activated carbon suspension, mixed solution A is obtained;

...

Embodiment 2

[0041] The particle size is 300 mesh, the specific surface area is 1200m 2 / g, the activated carbon with an average pore radius of 2.5nm is placed in a boiling mass concentration of 4% nitric acid solution for reflux treatment for 2h, then the activated carbon after the reflux treatment is washed with deionized water until the pH of the washing solution is 6, dried, and obtained Treated activated carbon carrier; soak the pretreated activated carbon carrier in a 0.3% sodium dodecylbenzenesulfonate aqueous solution, stir for 1 hour to make it mix evenly and reach adsorption equilibrium, and obtain the modified activated carbon suspension ;

[0042] Weigh platinum citrate, add deionized water to dilute to a platinum concentration of 10g / L, and under stirring, adjust the pH to 1 with hydrochloric acid to obtain a platinum precursor solution; the platinum precursor solution is added to the modified In the active carbon suspension, mixed solution A is obtained;

[0043]Add KOH to ...

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Abstract

The invention discloses a method for preparing a platinum-carbon catalyst. The method comprises the following steps: treating an activated carbon carrier by adopting a surfactant; adding a platinum precursor solution into the activated carbon carrier treated by the surfactant, adding an inorganic base and a dispersing agent, thereby obtaining dispersion liquid with uniformly dispersed precipitation particles; and finally, reducing a platinum compound, thereby obtaining the platinum-carbon catalyst. The activated carbon carrier is treated by the surfactant, so that the acting force between the platinum particles and the activated carbon carrier is improved, the catalytic activity of the catalyst is improved, and the service life of the catalyst is prolonged. In addition, the dispersing agent is added in the crystal growth process, so that aggregation of precipitates is avoided, the dispersity of the platinum particles on the surface of the activated carbon carrier is improved, and the prepared platinum-carbon catalyst is small in particles, so that the obtained platinum-carbon catalyst is uniform and stable. Therefore, according to the combined use of the surfactant and the dispersing agent in the preparation method disclosed by the invention, the prepared platinum-carbon catalyst is high in catalytic activity and long in service life.

Description

technical field [0001] The invention relates to the technical field of catalyst preparation, in particular to a method for preparing a platinum carbon catalyst. Background technique [0002] At present, there are mainly two methods for the preparation of platinum-carbon catalysts: impregnation method and colloidal solution method. In the process of preparing platinum carbon catalyst by impregnation method, the platinum nuclei will grow up and agglomerate in the liquid phase or on the surface of the carrier. The prepared catalyst has a wide range of active component particles, large particle size, and low platinum dispersion. A platinum-carbon catalyst with high activity and long life was prepared. Most of the active components of the platinum-carbon catalyst prepared by the colloidal solution method are exposed and deposited on the surface of the carrier carbon, which cannot solve the problem of firm adhesion between the active component nano-platinum and the carrier carbon...

Claims

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Application Information

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IPC IPC(8): B01J23/42
Inventor 蔡万煜李伟峰李晓龙周爱玲
Owner 陕西瑞科新材料股份有限公司
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