Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Preparation method for mesopore-micropore core-shell composite molecular sieve catalyst

A composite molecular sieve and catalyst technology, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of insufficient performance of macromolecular catalytic functions, hydrothermal stability, acid stability and poor strength, etc. problems, to achieve the effect of low price, simple operation, and simple equipment requirements

Active Publication Date: 2010-11-24
上海介孔谷新材料发展有限公司
View PDF3 Cites 59 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, due to the limitation of the composition of amorphous pore walls, its hydrothermal stability, acid stability and strength are still poor, failing to meet the requirements of industrial applications, and its macromolecular catalytic function is far from being fully realized.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method for mesopore-micropore core-shell composite molecular sieve catalyst
  • Preparation method for mesopore-micropore core-shell composite molecular sieve catalyst
  • Preparation method for mesopore-micropore core-shell composite molecular sieve catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Preparation of ZSM-5 zeolite molecular sieve with a size of 700 nm: Add 4.9 g of tetrapropylammonium hydroxide aqueous solution with a mass percentage concentration of 50% dropwise to 69.0 g of deionized water, stir well until the solution is clear, and then add ethyl orthosilicate 2.5 g, continued to stir for 12 hours, and the reaction solution was transferred to a hydrothermal kettle and heated for 24 hours at 180 °C. After hydroheating, the product was washed with a large amount of deionized water to neutrality, dried at 100°C for 5 hours, and roasted in an air atmosphere at 550°C for 5 hours in a muffle furnace to obtain the product. Scanning electron microscopy showed that the size of the resulting zeolite was around 700 nm, see figure 1 .

Embodiment 2

[0043] Preparation of nano-Y zeolite molecular sieve with a size of 80 nm: Add 12.0 g of tetramethylammonium hydroxide aqueous solution with a mass percentage concentration of 25% dropwise to 40.0 g of deionized water, stir well until the solution is clear, and then add 2.5 g of aluminum isopropoxide After stirring for 5 hours, 5.0 g of tetraethyl orthosilicate was added, the stirring was continued for 12 hours, and 6.0 g of aqueous sodium hydroxide solution with a mass percentage of 0.4% was added. This solution was reacted in an oil bath at 100 °C for 7 days. The resulting product was centrifuged at high speed and washed with a large amount of deionized water until neutral. Finally, freeze-dry to obtain nano Y zeolite with a size of 80 nm. The XRD spectrum proves that the obtained nano-Y zeolite molecular sieve is a pure faujasite phase with high crystallinity. See the wide-angle XRD spectrum figure 2 .

Embodiment 3

[0045] Using ZSM-5 with a particle size of 700 nanometers as the core, two-dimensional hexagonal p 6 mm Preparation of core-shell composite molecular sieves with mesoporous silica as the shell and a shell thickness of 75 nm: 0.05 g of cationic surfactant cetyltrimethylammonium bromide (CTAB) was dissolved in 10 g of water, In the mixed solution of 6.0 g ethanol and 0.12 g ammonia water, after stirring until the solution becomes clear, disperse 0.05 g ZSM-5 zeolite molecular sieve under the action of 200 W ultrasound, and after the dispersion is uniform, add 0.05 g tetraethyl orthosilicate. After reacting at 25 °C for 4 hours, the product was centrifuged and washed to neutrality, and dried at 100 °C for 5 hours. Then in the muffle furnace at 550 ° C, the air atmosphere was roasted for 5 hours to obtain the product. The XRD spectrum proves that the shell channel space symmetry of the obtained core-shell composite molecular sieve material is p 6 mm , XRD spectrum see imag...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
particle sizeaaaaaaaaaa
pore sizeaaaaaaaaaa
Login to View More

Abstract

The invention belongs to the technical field of material preparation and oil chemical engineering, and in particular discloses a preparation method for a mesopore-micropore core-shell composite molecular sieve catalyst. Zeolite particles are dispersed in organic solvent / water mixed solution which contains cationic surfactant and alkali under the action of ultrasound, and then silicon or silicon-aluminum species are introduced into the mixed solution to obtain a mesopore-micropore core-shell composite molecular sieve by solution phase self-assembly and a sol-gel process, wherein micropore zeolite serves as a core, and mesopore silicon oxide or aluminum-containing mesopore silicon oxide serves as a shell layer. The obtained composite molecular sieve has a retained zeolite micropore framework and an ordered two-dimensional hexagonal mesopore structure, a mesopore path is vertical with the surface of the zeolite particles, the path has high openness, the thickness of the mesopore shell layer is adjustable, and after the mesopore shell is packed, the mesopore-micropore can maintain high un-obstruction. The method has the advantages of simple operation, low raw material cost, low equipment requirement and the like.

Description

technical field [0001] The invention belongs to the technical fields of material preparation and petrochemical industry, and in particular relates to a method for preparing a mesoporous-microporous core-shell composite molecular sieve catalyst. Zeolite particles are dispersed in an organic solvent / water mixed solution containing cationic surfactants and alkalis under the action of ultrasound, and then silicon or silicon-aluminum species are introduced to obtain mesoporous-microstructures through solution-phase self-assembly and sol-gel processes. Pore ​​core-shell composite molecular sieve. And the mesopores in the shell are arranged vertically and orderly. The obtained mesoporous-microporous core-shell composite molecular sieve has a retained zeolite microporous framework, an ordered two-dimensional hexagonal mesoporous structure, and the mesoporous channels are perpendicular to the surface of the zeolite particles, and the channels are highly open. And after wrapping the m...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/80B01J29/40B01J29/08B01J35/10
Inventor 赵东元钱旭芳牛国兴李彬屠波
Owner 上海介孔谷新材料发展有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com