Preparation method of spherical mesoporous carbon-loaded noble metal catalyst

A noble metal catalyst and noble metal technology, applied in the direction of metal/metal oxide/metal hydroxide catalyst, chemical instrument and method, physical/chemical process catalyst, etc., can solve the problem of low catalytic performance of noble metal, poor dispersion effect of noble metal, preparation process Complicated problems, to achieve good economic benefits, easy promotion, and good product stability

Inactive Publication Date: 2018-03-06
上海泰坦科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Although the above-mentioned prior art can meet certain needs, there are still certain defects, such as complex preparation process, harsh conditions, poor dispersion effect of precious metals on activated carbon, resulting in low catalytic performance of precious metals, short service life, etc.

Method used

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  • Preparation method of spherical mesoporous carbon-loaded noble metal catalyst
  • Preparation method of spherical mesoporous carbon-loaded noble metal catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] (1) Spherical mesoporous carbon is prepared by reverse-phase suspension polymerization, and the specific surface area and pore diameter of mesoporous carbon are controlled by adjusting the amount of dispersant added in the suspension polymerization method, and the specific surface area is screened at 400-600m 2 / g, mesoporous carbon with a pore size between 7.5-9.5nm;

[0046] (2) Add the salt solution containing noble metal platinum into the nitric acid solution with a concentration of 5mol / L, heat and stir to obtain the impregnation solution, the heating temperature is 50°C, the stirring time is 5h, and the mass ratio of noble metal to mesoporous carbon is 0.4: 1;

[0047] (3) Using the equal volume impregnation method, impregnate the mesoporous carbon in the above impregnation solution, heat and stir, the heating temperature is 70°C, and the stirring time is 3h. After adjusting the pH value to 4-5, continue to stir at constant temperature and supplement it with ultra...

Embodiment 2

[0051] (1) Spherical mesoporous carbon is prepared by the hard template method, and the specific surface area and pore diameter of the mesoporous carbon are controlled by adjusting the amount of carbon source added in the template method, and the specific surface area is screened at 400-600m 2 / g, mesoporous carbon with a pore size between 7.5-9.5nm;

[0052] (2) Add the salt solution containing noble metal palladium into the hydrochloric acid solution with a concentration of 0.5mol / L, heat and stir to obtain the impregnation solution, the heating temperature is 50°C, the stirring time is 5h, and the mass ratio of noble metal to mesoporous carbon is 0.35 :1;

[0053] (3) Using the excessive impregnation method, impregnate the mesoporous carbon in the above impregnation solution, heat and stir, the heating temperature is 65°C, and the stirring time is 2h. After adjusting the pH value to 4-5, continue to stir at constant temperature and supplemented by ultrasonic vibration for 1...

Embodiment 3

[0057] (1) Spherical mesoporous carbon is prepared by reverse-phase suspension polymerization, and the specific surface area and pore diameter of mesoporous carbon are controlled by adjusting the amount of dispersant added in the suspension polymerization method, and the specific surface area is screened at 400-600m 2 / g, mesoporous carbon with a pore size between 7.5-9.5nm;

[0058] (2) Add the salt solution containing the precious metal rhodium into the sulfuric acid solution with a concentration of 8mol / L, heat and stir to obtain the impregnation solution, the heating temperature is 60°C, the stirring time is 6h, and the mass ratio of the precious metal to the mesoporous carbon is 0.45:1 ;

[0059] (3) Using the equal volume impregnation method, impregnate the mesoporous carbon in the above impregnation solution, heat and stir, the heating temperature is 80°C, and the stirring time is 4h. After adjusting the pH value to 4-5, continue to stir at constant temperature and supp...

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Abstract

The invention discloses a preparation method of a spherical mesoporous carbon-loaded noble metal catalyst. According to the preparation method, by changing a raw material ratio, a mesoporous carbon carrier with a controllable structure is obtained; meanwhile, soaking and loading conditions are adjusted, the reaction pH value is 4-5, the mass ratio of noble metals to mesoporous carbon is (0.35-0.45) to 1, the comprehensive optimization is carried out, and finally, the catalyst with high catalytic performance is obtained; and the prepared catalyst is utilized for catalyzing and synthesizing 4,4'-Diamino-2,2'-stilbenedisulfonic acid, and the yield is 99.5%. According to the preparation method, the preparation is simple, an environment-friendly effect is achieved, the catalyst is good in stability and long in service life, the problems that active metals are agglomerated and are not uniformly dispersed in the industrial preparation process of the catalyst at present are solved, the catalytic performance, the large-scale industrial production can be realized, good economic benefits can be brought to enterprises, and the preparation method has wide prospect.

Description

technical field [0001] The invention relates to the field of chemical synthesis, and mainly relates to a method for preparing a spherical mesoporous carbon-supported noble metal catalyst. Background technique [0002] Mesoporous carbon materials have become a research hotspot in recent years because of their high specific surface area, large pore volume, high electrical conductivity, thermal conductivity, chemical stability and excellent adsorption performance, and are widely used in gas adsorption and separation, sewage treatment, catalysts, etc. Carriers and electrochemistry and other fields. [0003] Precious metal catalysts are widely used in the field of catalysts because they can change the speed of chemical reactions without participating in the reaction themselves. Almost all noble metals can be used as catalysts. Their surfaces are easy to adsorb reactants, and their strength is moderate, which is conducive to the formation of intermediate active compounds. It has ...

Claims

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Application Information

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IPC IPC(8): B01J23/42B01J23/44B01J23/46B01J23/52B01J35/10B01J35/08C07C303/22C07C309/46
CPCC07C303/22B01J23/42B01J23/44B01J23/464B01J23/468B01J23/52B01J35/51B01J35/617B01J35/615B01J35/647C07C309/46
Inventor 谢应波张庆张华徐肖冰罗桂云张维燕
Owner 上海泰坦科技股份有限公司
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