Preparation method of molecular sieve coating material on surface of porous silicon carbide ceramic with surface rich in silicon

A technology of porous silicon carbide and silicon carbide ceramics, applied in chemical instruments and methods, molecular sieves and alkali exchange compounds, inorganic chemistry, etc., can solve the problems of molecular sieve layer shedding, increased side reactions, excessive metal carrier, etc., to achieve The effect of high interface bonding strength, change of grain size, and fast dissolution rate

Inactive Publication Date: 2010-06-09
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
View PDF1 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of metal as a carrier brings the following problems: 1) Since metal has a catalytic effect on many chemical reactions, while increasing unnecessary side reactions, it also makes the metal substrate susceptible to deep oxidation
2) There is a large difference in thermal expansion coefficient between metal and molecular sieve, and the molecular sieve layer will easily fall off when the temperature changes suddenly
4) Due to the high intrinsic density of the metal, the metal carrier accounts for too much in the entire catalyst
However, during the preparation of foamed silicon carbide, the amount of silicon on the surface is not easy to control

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 of molecular sieve coating material on surface of porous silicon carbide ceramic with surface rich in silicon
  • Preparation method of molecular sieve coating material on surface of porous silicon carbide ceramic with surface rich in silicon
  • Preparation method of molecular sieve coating material on surface of porous silicon carbide ceramic with surface rich in silicon

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] The preparation method of silicon-rich surface (the thickness of the silicon-rich layer on the surface of this embodiment is 3 microns) foamed silicon carbide ceramic surface silicalite-I molecular sieve coating material:

[0046] First, a hydrothermal synthesis solution is prepared, and tetrapropylammonium bromide, sodium hydroxide, and deionized water are mixed at a molar ratio of 0.1:0.6:100. The surface silicon-rich foam silicon carbide ceramics and silicon blocks (average particle size 800-1500 microns) are introduced into the reaction solution. The weight ratio of foam silicon carbide ceramic to the reaction solution is 1:20; the weight ratio of foam silicon carbide ceramic to solid silicon source The ratio is 1:0.5; the foamed silicon carbide ceramic is fixed 1 cm away from the bottom of the reactor with a polytetrafluoroethylene support frame, and the silicon block is placed at the bottom of the reactor; the volume of the solution is 50 ml, and the volume of the rea...

Embodiment 2

[0048] The preparation method of the ZSM-5 molecular sieve coating material on the surface of the silicon carbide foam ceramic surface is rich in silicon (the thickness of the silicon rich layer on the surface in this embodiment is 3 microns):

[0049] First, a hydrothermal synthesis solution is prepared, and tetrapropylammonium bromide, sodium hydroxide, and deionized water are mixed at a molar ratio of 0.1:0.8:100. The surface silicon-rich foamed silicon carbide ceramics, silicon-aluminum composite oxide sintered powder with a silicon-aluminum atomic ratio of 30:1 (on a 30-mesh sieve, in this embodiment, the silicon-aluminum composite oxide sintered powder has a silicon-aluminum atomic ratio The 30:1 ZSM-5 molecular sieve powder is granulated and molded, and then sintered at 1200°C for 1 hour) and silicon blocks (average particle size 2-3 mm) are introduced into the reaction solution, foam silicon carbide ceramics and the reaction solution The weight ratio is 1:20; the weight r...

Embodiment 3

[0051] The method for preparing the ZSM-11 molecular sieve coating material on the surface of the silicon carbide foam ceramic surface is rich in silicon (the thickness of the silicon rich layer on the surface in this embodiment is 3 microns):

[0052] First, prepare a hydrothermal synthesis solution, and mix tetrabutylammonium bromide, sodium hydroxide, and deionized water at a molar ratio of 0.1:0.8:100. The surface silicon-rich foamed silicon carbide ceramics and silicon-aluminum composite oxide sintered powder with a silicon-aluminum atomic ratio of 25:1 (average particle size 800-1500 microns, in this embodiment, the silicon-aluminum composite oxide sintered silicon-aluminum composite oxide The sintered powder is a ZSM-11 molecular sieve powder with a silicon-to-aluminum atomic ratio of 25:1, which is obtained after granulation, molding, and sintering at 1200°C for 1 hour.) The weight ratio of the foamed silicon carbide ceramic to the reaction solution It is 1:20; the weight...

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
pore sizeaaaaaaaaaa
pore sizeaaaaaaaaaa
Login to view more

Abstract

The invention relates to a preparation method of a molecular sieve coating material on the surface of porous silicon carbide ceramic with the surface rich in silicon, and the molecular sieve coating material is prepared by using the porous silicon carbide ceramic with the surface rich in silicon as a carrier; using solid materials, such as silicon blocks, quartz, sliicon-alumininm composite oxide sintering powder with adjustable sliicon-alumininm atomic ratio, and the like as a silicon source or a sliicon-alumininm source, and adopting a in situ hydrothermally synthesizing method. Molecular sieve crystals preferentially nucleate on the surface of the porous silicon carbide ceramic due to a surface silicon layer of the porous silicon carbide ceramic, the solid silicon source or the sliicon-alumininm source are used so that the release speed of the silicon source or sliicon-alumininm source for the growth of crystal nucleus is controllable. Therefore, prepared molecular sieve coating is uniformly loaded on the surface of the silicon carbide ceramic carrier; the composite material formed by a molecular sieve and the porous silicon carbide ceramic has a unique micropore / macropore structure; chemical combination is realized between the molecular sieve and the porous silicon carbide ceramic, and the molecular sieve and the porous silicon carbide ceramic have high interface combination strength. The preparation method has simple technology, convenient operation without complex equipment and low manufacturing cost and is more suitable for industrialized and mass production.

Description

Technical field [0001] The present invention belongs to the preparation technology of surface silicon-rich porous silicon carbide ceramic surface molecular sieve coating material, and particularly provides a high interface bonding strength and uniform loading surface silicon-rich silicon carbide ceramic surface including pentasil family molecular sieve (including ZSM-5, silicalite -I, β, ZSM-11, silicalite-II and ZSM-12 type molecular sieve, etc.) and mordenite type molecular sieve and other molecular sieve coating materials preparation methods. Background technique [0002] Molecular sieves are crystalline aluminosilicates with uniform crystal structure, which are characterized by many regular pores interconnected by a large number of small rectangular channels. It has been found that due to this structure consisting of a network of interconnected uniform-sized pores and channels, crystalline molecular sieves can absorb molecules with a size lower than a certain appropriate pres...

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): C04B41/85C01B39/00
Inventor 张劲松矫义来杨振明田冲曹小明
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap