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

Preparation method of Silicalite-1/ZSM-5 composite molecular sieve

A ZSM-5, composite molecular sieve technology, used in molecular sieve catalysts, microsphere preparation, chemical instruments and methods, etc., can solve the uncontrollable thickness of composite molecular sieve shell structure, adverse reactions, and reduce composite molecular sieve catalytic effect and type selection effect. and other problems, to achieve the effect of being conducive to large-scale production and simple operation

Active Publication Date: 2015-03-18
CHINA PETROLEUM & CHEM CORP +1
View PDF9 Cites 8 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the thickness of the shell structure of the composite molecular sieve prepared by this method cannot be controlled, which is not conducive to the progress of the reaction.
[0005] The existing synthesis methods of Silicalite-1 / H-ZSM-5 composite molecular sieves all have the disadvantage of incomplete encapsulation to varying degrees
Due to the existence of these unwrapped crystals, the catalytic effect and type selection effect of the composite molecular sieve are reduced during the reaction process.

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 Silicalite-1/ZSM-5 composite molecular sieve
  • Preparation method of Silicalite-1/ZSM-5 composite molecular sieve
  • Preparation method of Silicalite-1/ZSM-5 composite molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Disperse 50 grams of ZSM-5 molecular sieve evenly in water under the ultrasonic frequency of 40KHz and ultrasonic power of 360W. Under the condition of water bath temperature of 25°C, adjust the pH value to 9 with ammonia water, and add template agent tetrapropyl bromide ammonium chloride, and then ethyl tetrasilicate was added, and the resulting mixture was reacted for 4 hours at a stirring speed of 200 rpm, separated, and dried at a temperature of 80°C to obtain a pretreated ZSM-5 molecular sieve Z1.

[0031] The particle size of ZSM-5 molecular sieve is 500nm; the silica / alumina molecular molar ratio is 27; the mass ratio of ethyl orthosilicate (calculated as silica) to ZSM-5 molecular sieve is 0.2; template agent (template agent TPA + The mass ratio of ZSM-5 to pretreated ZSM-5 is 1.5; the XRD diffraction pattern of ZSM-5 molecular sieve is shown in figure 2 .

Embodiment 2

[0033] Disperse 50 grams of ZSM-5 molecular sieve evenly in water under the ultrasonic frequency of 60KHz and ultrasonic power of 800W. Under the condition of water bath temperature of 55°C, adjust the pH value to 5 with sulfuric acid, and add the template agent tetrapropyl hydrogen ammonium oxide, and then ethyl tetrasilicate was added, and the resulting mixture was reacted at a stirring speed of 300 rpm for 4 hours, separated, and dried at 60°C to obtain a pretreated ZSM-5 molecular sieve Z2.

[0034] The particle size of ZSM-5 molecular sieve is 800nm; the silica / alumina molecular molar ratio is 76; the mass ratio of tetraethyl orthosilicate (calculated as silica) to ZSM-5 molecular sieve is 0.35; template agent (template agent TPA + Count) and the mass ratio of pretreatment ZSM-5 is 2.

Embodiment 3

[0036] Disperse 40 grams of ZSM-5 molecular sieve evenly in water under the action of ultrasonic frequency of 40KHz and power of 2000W. Under the condition of water bath temperature of 75°C, adjust the pH value to 12 with ammonia water, and add template agent tetrapropyl bromide ammonium chloride, and then methyl orthosilicate was added, and the resulting mixture was reacted for 3.5 hours at a stirring speed of 250 rpm, separated, and dried at a temperature of 100°C to obtain a pretreated ZSM-5 molecular sieve Z3.

[0037]The particle size of ZSM-5 molecular sieve is 300nm; the silica / alumina molecular molar ratio is 150; the mass ratio of methyl orthosilicate (calculated as silica) to ZSM-5 molecular sieve is 0.6; template agent (template agent TPA + Count) to the mass ratio of pretreated ZSM-5 is 0.5.

[0038] Synthesis of Composite Molecular Sieves

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

No PUM Login to View More

Abstract

The invention discloses a preparation method of a Silicalite-1 / ZSM-5 composite molecular sieve, which comprises the following steps: 1)dispersing a ZSM-5 molecular sieve in water under ultrasonic effect, adjusting pH value to 2-6 or 8-13, adding a template, then adding silicon source, uniformly stirring, performing solid-liquid separation, drying to obtain the pretreated ZSM-5 molecular sieve; 2)adding the pretreated ZSM-5 molecular sieve in a mixing solution containing sodium hydroxide and water, uniformly stirring, crystallizing, washing, and drying to obtain the Silicalite-1 / ZSM-5 molecular sieve. According to the invention, the composite molecular sieve Silicalite-1 is completely covered on the ZSM-5 external surface, thickness is uniform, operation is simple, the composite molecular sieve is convenient for large scale production, and the composite molecular sieve has latent application value in toluene methanol alkylation and xylene isomerization reactions.

Description

technical field [0001] The invention belongs to the field of molecular sieve synthesis, and in particular relates to a simple preparation method of Silicalite-1 / ZSM-5 composite molecular sieve. Background technique [0002] At present, composite molecular sieves have attracted more and more researchers' attention. Various composite molecular sieves are constantly being synthesized. Such as the MCM-41 / ZSM-5 composite molecular sieve disclosed in CN1208718A, the microporous molecular sieve (ZSM-5, β zeolite, mordenite, L-type zeolite, MCM-22, ZSM-35) and mesoporous molecular sieve (MCM-35) disclosed in CN1597516A 41) Composite molecular sieve, ZSM-22 / ZSM-23 composite molecular sieve disclosed in CN1686800A, ZSM-35 / MCM-22 composite molecular sieve disclosed in CN101003379A, ZSM-5 / mordenite composite molecular sieve disclosed in CN101091920, ZSM-5 / SAPO-5 (or AlPO4-5) composite molecular sieve, (Chem Mater 2006, 18, 4959-4966) reported composite molecular sieve with core-shell...

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): B01J29/80B01J13/02
Inventor 秦波宋喜军刘全杰
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