Preparation method of noble metal catalyst

A precious metal catalyst, precious metal technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc. Surface, complex operation process and other problems, to achieve the effect of short reaction time, small particle size and low reaction energy consumption

Inactive Publication Date: 2014-09-24
QINGDAO DONGFANG RECYCLING ENERGY +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

After the activated carbon is ultrasonically treated with nitric acid solution, it is cleaned with deionized water until neutral, then added to the water-soluble precursor solution of metal ruthenium for stirring and impregnation, and then the pH is adjusted with the aqueous solution of basic compound, and the liquid phase is carried out by adding a chemical reducing agent. Reducing the ruthenium-carbon catalyst, washing and drying the product to obtain a nano-ruthenium-carbon supported metal hydrogenation catalyst, but the dispersion of the metal catalyst prepared by this method is low, it is difficult for the metal to disperse to the surface of the carrier, and the operation process is complicated

Method used

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  • Preparation method of noble metal catalyst
  • Preparation method of noble metal catalyst
  • Preparation method of noble metal catalyst

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Experimental program
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Effect test

Embodiment 1

[0025] 5g activated carbon, 13ml, 0.2mol / L RuCl 3 The solution was mixed with 4 mL of 5% sodium dodecylsulfonate, dispersed under the action of ultrasonic waves, and the ultrasonic frequency was set to 40KHz, and the ultrasonic time was set to 0.5h. Add 20ml of the mixture obtained after ultrasonication, and reduce with 0.25mol / L sodium borohydride solution under microwave radiation, set the microwave radiation power to 20w, time to 1h, and reduction reaction temperature to 70°C. The obtained solid product was washed 5 times with distilled water, and then dried at 80° C. for 10 h to obtain a 5% Ru / C catalyst.

[0026] from figure 1 The metal Ru of the Ru / C catalyst has good dispersion, the dispersion is relatively uniform, and the metal particle size is small.

Embodiment 2

[0028] 1g activated carbon, 5ml, 0.0376mol / L Pd(NO 3 ) 2 The solution was mixed with 2mL, 3% sodium dodecylbenzenesulfonate, dispersed under the action of ultrasonic waves, and the ultrasonic frequency was set to 60KHz, and the ultrasonic time was set to 0.5h. Add 10ml of the mixture obtained after ultrasonication, and reduce with 0.3mol / L sodium borohydride solution under microwave radiation. The obtained solid product was washed 5 times with distilled water, and then dried at 80° C. for 10 h to obtain a 2% Pd / C catalyst.

[0029] from figure 2 The metal Pd of the Pd / C catalyst has good dispersion, the dispersion is relatively uniform, and the metal particle size is small.

Embodiment 3

[0031] 1g activated carbon, 2ml, 0.0125mol / L K 2 PtCl 4 The solution was mixed with 5 mL of 4% sodium dodecylsulfonate, dispersed under the action of ultrasonic waves, the ultrasonic frequency was set to 80 KHz, and the ultrasonic time was 1 h. Add 10ml of the mixture obtained after ultrasonication, and reduce with 0.15mol / L sodium borohydride solution under microwave radiation. The obtained solid product was washed 5 times with distilled water, and then dried at 80° C. for 10 h to obtain a 0.5% Pt / C catalyst.

[0032] from image 3 The metal Pt of the Pt / C catalyst has good dispersion, the dispersion is relatively uniform, and the metal particle size is small.

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Abstract

The invention relates to a preparation method of a noble metal catalyst. The method comprises the following steps: (1) mixing a carrier, a salt solution of noble metal, and a dispersant, and performing dispersion in the presence of ultrasonic wave to obtain a mixture; (2) adding the mixture in a reductant and performing reduction under microwave radiation to obtain a solid product; and (3) washing the solid product with distilled water, and drying the solid product to obtain the noble metal catalyst. The preparation method is simple and easy to operate; metal is dispersed uniformly on the carrier, the particle size of the metal is small, the reaction time is short and the energy consumption in reaction is low.

Description

technical field [0001] The invention belongs to the field of catalysts, and in particular relates to a preparation method of a noble metal catalyst. Background technique [0002] Supported noble metal catalysts play an extremely important role in petroleum, chemical, pharmaceutical, pesticide, food and other fields due to their irreplaceable catalytic activity and selectivity. Noble metal catalysts are widely used in reactions such as hydroreduction, oxidative dehydrogenation, hydrocracking, and hydrodesulfurization in the petroleum and chemical industries. In terms of environmental protection, noble metal catalysts are widely used in the treatment of automobile exhaust. In terms of new energy, noble metal catalysts are the most critical part in the development of new fuel cells. However, precious metal resources are scarce and expensive, which greatly increases the cost of noble metal catalysts. Therefore, improving the activity of noble metal catalysts, reducing the amo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J23/44B01J23/46B01J23/52
Inventor 建方方马连湘吴锋周超
Owner QINGDAO DONGFANG RECYCLING ENERGY
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