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

Preparation method for nanometer ZSM-5 hierarchical-pore aggregate

A ZSM-5 and aggregate technology is applied in the field of preparation of nano ZSM-5 hierarchical porous aggregates, which can solve the problems of cumbersome preparation process, long crystallization time, and difficulty in industrialization, and achieves simple preparation method and reduced diffusion resistance. , high repeatability

Active Publication Date: 2018-03-27
CHINA PETROLEUM & CHEM CORP +1
View PDF8 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

To solve the problem of solid / liquid phase separation in the industrial production of nano zeolites with different particle sizes obtained in the existing technology, and the preparation process of multi-stage porous ZSM-5 zeolite molecular sieve is cumbersome, the crystallization time is long, the cost is high and the environmental pollution is large , the problem of not being easy to industrialize

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Synthetic method: Add 15g of water, 0.051g of aluminum sulfate octadecahydrate, and 12g of tetrapropylammonium hydroxide into the reaction kettle. After stirring evenly, slowly add 5g of silica sol with a mass fraction of 40% during the stirring process, and add Add 4.0 g of dichlorodimethylsilane (DMCS), add 1 g of sodium hydroxide, stir for 30 min, and age the gel at room temperature for 24 h. After that, it was crystallized at 180°C for 2 days under stirring at 150rpm, cooled to room temperature, washed with deionized water and centrifuged three times, and dried at 80°C for 12 hours to obtain the final product.

[0042] From the XRD spectrum of the product obtained in Example 1, it can be seen that the product has a characteristic diffraction peak of ZSM-5, and has a relatively high degree of crystallinity. From the SEM photo of the product obtained in Example 1, it can be seen that the sample presents a spherical shape, the particle size is 3 microns, and it is form...

Embodiment 2

[0044] Using the same conditions as in Example 1, after stirring evenly, slowly add 4g of silicon powder dropwise during the stirring process, add 4g of dichlorodimethylsilane, add 1g of sodium hydroxide, stir for 30min, and age the gel at room temperature for 24h. After that, it was crystallized at 180°C for 2 days under stirring at 150rpm, cooled to room temperature, washed with deionized water and centrifuged three times, and dried at 80°C for 12 hours to obtain the final product. According to the XRD characterization results of the sample, it can be seen that the product has the characteristic diffraction peak of ZSM-5. The SEM photo shows that the sample presents a spherical shape with a particle size of 4 microns, which is formed by accumulation of nanoparticles. Due to the accumulation effect, the aggregate has a pore size of 3-6nm mesoporous structure, nano ZSM-5 particle size is 120nm. The BET data of the product obtained in Example 2 shows that the sample has a micro...

Embodiment 3

[0046] Synthetic method: Add 15g of water, 0.016g of aluminum isopropoxide, and 9g of tetrapropylammonium hydroxide into the reaction kettle. After stirring evenly, slowly add 5g of silica sol with a mass fraction of 40% dropwise during the stirring process, and add 5g of Add sodium hydroxide to trimethylchlorosilane (TMCS), stir for 30 minutes, and age the gel at room temperature for 24 hours. After that, it was crystallized at 180°C for 2 days under stirring at 150rpm, cooled to room temperature, washed with deionized water and centrifuged three times, and dried at 80°C for 12 hours to obtain the final product. According to the XRD characterization results of the sample, it can be seen that the product has the characteristic diffraction peak of ZSM-5. The SEM photo shows that the sample presents a spherical shape with a particle size of 2 microns, which is formed by the accumulation of nanoparticles. Due to the accumulation effect, the aggregate has a pore size of 3-6nm meso...

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 diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention specifically relates to a preparation method for a nanometer ZSM-5 hierarchical-pore aggregate formed by aggregation of nanometer zeolite crystal grains, belonging to the technical fieldof synthesis of zeolite molecular sieves. The aggregate has a mesoporous structure with a pore size of 3 to 6 nm due to accumulation effect, so the aggregate has the characteristic of hierarchical pores and contains a microporous-mesoporous structure. The aggregate has a particle size of 2 to 5 [mu]m, and ZSM-5 nanometer particles have sizes in a range of 80 to 150 nm. According to the invention,industrial cheap silica sol and silicon powder are used as raw materials, a silylating reagent is added, and high-flux equipment is employed for preparing the nanometer ZSM-5 hierarchical-pore aggregate in a hydro-thermal system through a one-step synthesis method; the prepared nanometer ZSM-5 hierarchical-pore aggregate has the advantages of reduced diffusional resistance, shortened diffusion path, etc.; and the method is simple in process, easy for industrialization and high in repeatability.

Description

technical field [0001] The invention belongs to the technical field of zeolite molecular sieve synthesis, and in particular relates to a preparation method of nanometer ZSM-5 hierarchical pore aggregates. Background technique [0002] ZSM-5 zeolite belongs to the second generation zeolite and has a typical MFI structure. Due to its special two-dimensional straight pore system and intersecting pore structure, high hydrothermal stability, shape selectivity, and lipophilic and hydrophobic capabilities, ZSM-5 has gradually developed into the preferred catalytic material in the petrochemical field. Hierarchical zeolites have three-dimensional cross-links in the crystal or between particles, and thus have greatly improved diffusion, catalytic activity, shape selectivity, and reaction lifetime, and have attracted extensive attention. [0003] CN201310384533.X discloses a preparation method of ZSM-5 type medium and micro double-hole composite molecular sieve. This method converts ...

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): C01B39/40B82Y40/00
CPCC01B39/40C01P2004/03C01P2004/62C01P2004/64C01P2006/16
Inventor 史静滕加伟任丽萍李斌
Owner CHINA PETROLEUM & CHEM CORP
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