Composite material with stepped hole structure distribution and preparation method thereof

Abstract

The invention discloses a composite material with stepped hole structure distribution and a preparation method thereof. Comprising the following steps: 1) mixing a template agent F127 or P123 with a corresponding silicon source in an acidic environment, and heating and stirring until the mixture is uniform; 2) uniformly dropwise adding a pore-enlarging agent into the mixed solution obtained in the step 1), uniformly stirring, and standing for a period of time to obtain a white precipitate; and 3) putting the obtained precipitate into a crystallization kettle for crystallization, and performing crystallization, suction filtration, drying and roasting to obtain the SBA-15 and MCFs composite material which has a stepped pore structure. The pore size of 15-20 nm of the composite material accounts for 20% or above, the pore size of 48-53 nm of the composite material accounts for 15% or above, the specific surface area is 400-600 m < 2 > / g, and the pore volume is 1.0-2.0 cm < 3 > / g. The composite material has the characteristics of larger specific surface area, stepped pore structure, adjustable pore diameter and the like, so that the composite material is widely applied to the fields of catalysis, absorption and separation, biomedical treatment and the like, and particularly is more widely applied to petroleum refining.

Description

technical field

[0001] The invention belongs to the field of material synthesis, and in particular relates to a composite material with stepped pore structure distribution and a preparation method thereof, which is widely used in the fields of catalysis, absorption separation, biomedicine and the like, especially in petroleum refining. Background technique

[0002] In recent years, smog has shrouded major cities across the country, causing great harm to people's health and travel. Studies have found that motor vehicle exhaust is one of the main sources of haze weather, and sulfide in motor vehicle exhaust is one of the main pollutants. The composition of gasoline in my country is dominated by FCC gasoline components, accounting for about 80%, which is characterized by insufficient high-sulfur, high-olefin and high-octane components. Moreover, as the feedstock processed by FCC develops in the direction of heavy weight, the sulfur content and olefin content in FCC gasoline wi...

Examples

preparation example Construction

[0026] The invention discloses a method for preparing a composite material with stepped pore structure distribution. It includes the following steps: 1) Mix the template agent F127 or P123 with the corresponding silicon source in an acidic environment and heat and stir until uniform; 2) Evenly add the pore expander dropwise to the mixed solution obtained in 1), stir evenly and then let it stand for a while 3) put the above-mentioned precipitate into a crystallization kettle for crystallization, obtain SBA-15 and MCFs composite material after crystallization, suction filtration, drying, and roasting, and the material has a stepped pore structure. In the present invention, the composite material specific surface area is 400~600m 2 / g, the pore volume is 1.0~2.0cm 3 / g, the pore diameter of 15-20nm accounts for more than 20%, and the pore diameter of 48-53nm accounts for more than 15%.

[0027] The preparation method of the composite material provided by the present invention h...

Embodiment 1

[0037] Preparation of MCFs-SBA-15 composites

[0038] ①Using P123 as the template agent, weigh 40g deionized water, 60g certain concentration of hydrochloric acid and 2g P123 template agent, stir in a water bath at 35°C until a uniform solution is formed;

[0039] ②The pore-enlarging agent mesitylene of 30wt% of the template agent was slowly added dropwise to the homogeneous solution of step ①, and continued stirring in a water bath to obtain a mixed solution;

[0040] ③ Weigh 10wt% tetraethyl orthosilicate (TEOS) as a template agent, slowly add it dropwise to the mixed solution in step ②, and place it in a sealed environment to continue stirring in a water bath, then transfer it to a crystallization tank and place it at 120°C Crystallization in oven for 24h;

[0041] ④ After the crystallization process is over, take out the crystallization kettle for cooling water treatment, filter and wash the product, dry it at 120°C for about 12 hours, and roast it in a muffle furnace at ...

Embodiment 2

[0043] Preparation of MCFs-SBA-15 composites

[0044] ①Using P123 as the template, weigh 40g of deionized water, 60g of hydrochloric acid of a certain concentration and 2g of P123 template, and stir in a water bath at 35°C until a uniform solution is formed;

[0045] ②The pore-enlarging agent mesitylene, which takes 30wt% of the template agent, is slowly added dropwise to the homogeneous solution of step ①, and continues to stir in a water bath to obtain a mixed solution;

[0046] ③ Weigh water glass with 30wt% template agent, slowly add it dropwise to the mixed solution in step ②, and place it in a sealed environment to continue stirring in a water bath, then transfer it to a crystallization kettle and place it in an oven at 120°C for crystallization for 24 hours;

[0047] ④ After the crystallization process is over, take out the crystallization kettle for cooling water treatment, filter and wash the product, dry it at 120°C for about 12 hours, and roast it in a muffle furnac...

technical field

[0001] The invention belongs to the field of material synthesis, and in particular relates to a composite material with stepped pore structure distribution and a preparation method thereof, which is widely used in the fields of catalysis, absorption separation, biomedicine and the like, especially in petroleum refining. Background technique

[0002] In recent years, smog has shrouded major cities across the country, causing great harm to people's health and travel. Studies have found that motor vehicle exhaust is one of the main sources of haze weather, and sulfide in motor vehicle exhaust is one of the main pollutants. The composition of gasoline in my country is dominated by FCC gasoline components, accounting for about 80%, which is characterized by insufficient high-sulfur, high-olefin and high-octane components. Moreover, as the feedstock processed by FCC develops in the direction of heavy weight, the sulfur content and olefin content in FCC gasoline wi...

Examples

preparation example Construction

[0026] The invention discloses a method for preparing a composite material with stepped pore structure distribution. It includes the following steps: 1) Mix the template agent F127 or P123 with the corresponding silicon source in an acidic environment and heat and stir until uniform; 2) Evenly add the pore expander dropwise to the mixed solution obtained in 1), stir evenly and then let it stand for a while 3) put the above-mentioned precipitate into a crystallization kettle for crystallization, obtain SBA-15 and MCFs composite material after crystallization, suction filtration, drying, and roasting, and the material has a stepped pore structure. In the present invention, the composite material specific surface area is 400~600m 2 / g, the pore volume is 1.0~2.0cm 3 / g, the pore diameter of 15-20nm accounts for more than 20%, and the pore diameter of 48-53nm accounts for more than 15%.

[0027] The preparation method of the composite material provided by the present invention h...

Embodiment 1

[0037] Preparation of MCFs-SBA-15 composites

[0038] ①Using P123 as the template agent, weigh 40g deionized water, 60g certain concentration of hydrochloric acid and 2g P123 template agent, stir in a water bath at 35°C until a uniform solution is formed;

[0039] ②The pore-enlarging agent mesitylene of 30wt% of the template agent was slowly added dropwise to the homogeneous solution of step ①, and continued stirring in a water bath to obtain a mixed solution;

[0040] ③ Weigh 10wt% tetraethyl orthosilicate (TEOS) as a template agent, slowly add it dropwise to the mixed solution in step ②, and place it in a sealed environment to continue stirring in a water bath, then transfer it to a crystallization tank and place it at 120°C Crystallization in oven for 24h;

[0041] ④ After the crystallization process is over, take out the crystallization kettle for cooling water treatment, filter and wash the product, dry it at 120°C for about 12 hours, and roast it in a muffle furnace at ...

Embodiment 2

[0043] Preparation of MCFs-SBA-15 composites

[0044] ①Using P123 as the template, weigh 40g of deionized water, 60g of hydrochloric acid of a certain concentration and 2g of P123 template, and stir in a water bath at 35°C until a uniform solution is formed;

[0045] ②The pore-enlarging agent mesitylene, which takes 30wt% of the template agent, is slowly added dropwise to the homogeneous solution of step ①, and continues to stir in a water bath to obtain a mixed solution;

[0046] ③ Weigh water glass with 30wt% template agent, slowly add it dropwise to the mixed solution in step ②, and place it in a sealed environment to continue stirring in a water bath, then transfer it to a crystallization kettle and place it in an oven at 120°C for crystallization for 24 hours;

[0047] ④ After the crystallization process is over, take out the crystallization kettle for cooling water treatment, filter and wash the product, dry it at 120°C for about 12 hours, and roast it in a muffle furnac...

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