A kind of modified Y-type molecular sieve and preparation method thereof

A molecular sieve and modification technology, applied in octahedral crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., to achieve strong anti-coking ability, reduce silicon-aluminum ratio, good catalytic activity and diffusion performance

Active Publication Date: 2018-08-14
CHINA PETROLEUM & CHEM CORP +1
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pore size of the prepared secondary pore structure is mainly concentrated in 3~5nm, and it is still powerless for the conversion of some aromatic hydrocarbon macromolecules with two rings and above. Therefore, the preparation of molecular sieves with larger pore structures is a very important scientific research direction.

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
  • A kind of modified Y-type molecular sieve and preparation method thereof
  • A kind of modified Y-type molecular sieve and preparation method thereof
  • A kind of modified Y-type molecular sieve and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Under stirring conditions, mix Y-1 and tetrapropylammonium hydroxide solution in a high-pressure reactor, feed nitrogen to control the system pressure at 0.4MPa, then raise the temperature to 70°C, continue stirring at constant temperature for 2 hours, and release the pressure. Cool, filter with suction until the pH value is less than 9, dry at 120°C for 12 hours, and calcinate at 500°C for 3 hours to obtain a modified Y-type molecular sieve. The concentration of the tetrapropylammonium hydroxide solution is 0.12mol / L, and the mass ratio of Y-1 to water in the solution is 1:9. The specific properties of molecular sieves are shown in Table 1.

Embodiment 2

[0022] Under stirring conditions, Y-1 and tetrabutylammonium hydroxide solution were mixed in a high-pressure reactor, and air was introduced to control the system pressure at 0.6MPa, then the temperature was raised to 80°C, and constant temperature stirring was continued for 1 hour, pressure relief, cooling, Suction filtration until the pH value is less than 9, drying at 110°C for 18 hours, and calcining at 550°C for 4 hours to obtain a modified Y-type molecular sieve. The concentration of tetrabutylammonium hydroxide solution is 0.15mol / L, and the mass ratio of Y-1 to water in the solution is 1:11. The specific properties of molecular sieves are shown in Table 1.

Embodiment 3

[0024] Under stirring conditions, mix Y-1 and tetraethylammonium hydroxide solution in a high-pressure reactor, feed nitrogen to control the system pressure at 0.2MPa, then raise the temperature to 60°C, continue stirring at constant temperature for 3 hours, and release the pressure. Cool, filter with suction until the pH value is less than 9, dry at 100°C for 24 hours, and calcinate at 520°C for 6 hours to obtain a modified Y-type molecular sieve. The concentration of tetraethylammonium hydroxide solution is 0.14mol / L, and the mass ratio of Y-1 to water in the solution is 1:10. The specific properties of molecular sieves are shown in Table 1.

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
specific surface areaaaaaaaaaaa
specific surface areaaaaaaaaaaa
specific surface areaaaaaaaaaaa
Login to view more

Abstract

The invention discloses a modified Y type molecular sieve and a preparation method thereof. The molecular sieve has the following properties: the total pore volume is 0.76-1.25ml / g, wherein the mesoporous volume is 0.55-1.05ml / g and the mesoporous volume is 65-90% of the total pore volume; the mole ratio of silicon oxide to aluminum oxide is 10-35; and the specific surface area is 680-1050m<2> / g. The preparation method comprises the following steps: under a stirring condition, adding the Y type molecular sieve into a pressure container filled with organic aqueous alkali; closing the system; increasing the pressure to 0.2-1.0MPa, and then increasing temperature to 50-90 DEG C and treating for 0.5-3 hours under constant temperature; and relieving pressure, performing suction filtration, drying and roasting, thereby acquiring the modified Y type molecular sieve. The molecular sieve has larger-size mesoporous distribution and can supply much more reaction space for macromolecules; the catalytic performance of the molecular sieve is promoted; and the preparation method is simple and is suitable for industrial application.

Description

technical field [0001] The invention relates to a modified Y-type molecular sieve and a preparation method thereof. Background technique [0002] Y-type molecular sieve is formed by octahedral molecular sieve cages interpenetrating with each other along three crystal axis directions through twelve-membered rings. It is an excellent catalyst active component, not only has high cracking activity, but also has good selectivity. Therefore, the discovery and use of Y-type molecular sieve has epoch-making significance in the field of catalysis. [0003] Since Y-type molecular sieves with a low silicon-aluminum ratio (the molar ratio of silicon oxide to aluminum oxide is between 3 and 4.2) do not have good hydrothermal stability, they have not been widely studied and widely used in the actual synthesis process and application. attention. The high silicon-aluminum ratio Y-type molecular sieve (the molar ratio of silicon oxide to aluminum oxide is above 4.3) has good hydrothermal s...

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 Patents(China)
IPC IPC(8): C01B39/24
CPCC01B39/24C01P2002/72C01P2006/14
Inventor 秦波杜艳泽柳伟张晓萍王凤来
Owner CHINA PETROLEUM & CHEM CORP
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