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Method for in situ synthesis of Y/beta composite molecular sieve

A composite molecular sieve, in-situ synthesis technology, applied in molecular sieve catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of weak acidity, single pore size, low activity, etc.

Active Publication Date: 2014-11-19
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] CN200810043115.3 discloses a mordenite / beta molecular sieve / Y molecular sieve symbiotic material and its synthesis method, mainly to solve the problems of single pore size, weak acidity and low activity of the porous material synthesized in the prior art

Method used

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  • Method for in situ synthesis of Y/beta composite molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] First, dissolve 4.0g of sodium hydroxide and 1.7g of sodium aluminate in 35g of deionized water, and slowly add 14g of silica sol into the above solution after completely dissolving, stir well, and age at room temperature for 10 hours to obtain gel A; Next, dissolve 0.1g of sodium aluminate and 0.3g of sodium hydroxide in 10g of 25% tetraethylammonium bromide solution. After the solution is completely dissolved, slowly add 4g of coarse-pore silica gel into the above solution, and stir to obtain a condensate. Gel B; Finally, slowly add gel B to gel A, stir evenly at room temperature, put the above-mentioned final mixed gel into an autoclave, and crystallize at 100°C for 24h and at 140°C for 20h under autogenous pressure , taking out the crystallized product, washing with deionized water, filtering, drying and roasting to obtain a compound molecular sieve containing Y molecular sieve and β molecular sieve structure.

Embodiment 2

[0022] First, dissolve 4.3g of sodium hydroxide and 1.6g of sodium aluminate in 35g of deionized water, and slowly add 14g of silica sol into the above solution after completely dissolving, stir well, and age at room temperature for 6 hours to obtain gel A; Next, dissolve 0.25g of aluminum isopropoxide and 0.3g of sodium hydroxide in 16g of 15% tetraethylammonium bromide solution, after completely dissolving, slowly add 4g of white carbon black into the above solution, stir evenly to obtain Gel B; Finally, slowly add gel B to gel A, stir evenly at room temperature, put the above-mentioned final mixed gel into an autoclave, and crystallize at 100°C for 24h under autogenous pressure, and crystallize at 130°C After 24 hours, the crystallized product was taken out, washed with deionized water, filtered, dried and calcined to obtain a composite molecular sieve containing Y molecular sieve and β molecular sieve structures.

Embodiment 3

[0024] First, dissolve 3.1g of sodium hydroxide and 1.7g of sodium aluminate in 35g of deionized water, and slowly add 14g of water glass into the above solution after completely dissolving, stir well, and age at room temperature for 4 hours to obtain gel A; Next, dissolve 0.25g of aluminum isopropoxide and 0.3g of sodium hydroxide in 10g of 25% tetraethylammonium bromide solution, after completely dissolving, slowly add 4g of coarse-pore silica gel into the above solution, and stir evenly to obtain Gel B; Finally, slowly add gel B to gel A, stir evenly at room temperature, put the above-mentioned final mixed gel into an autoclave, and crystallize at 100°C for 24h under autogenous pressure, and crystallize at 120°C After 30 hours, the crystallized product was taken out, washed with deionized water, filtered, dried and calcined to obtain a composite molecular sieve containing Y molecular sieve and β molecular sieve structures.

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Abstract

The invention relates to a method for in situ synthesis of a Y / beta composite molecular sieve. The method comprises the following steps: taking following components according to following mol ratios, i.e., SiO2 / Al2O3=4 to 100, OH<-> / SiO2=0.001 to 1, M / SiO2=0.05 to 1 and H2O / SiO2=3 to 100; dissolving an alkali source and an aluminum source in deionized water, adding a silicon source into an obtained mixed solution and carrying out stirring so as to obtain gel A; dissolving an alkali source, an aluminum source and a template in deionized water, slowly adding a silicon source into an obtained mixed solution and carrying out uniform stirring so as to obtain gel B; slowly adding gel B into gel A, putting an obtained mixture into a pressure kettle, carrying out crystallization at a temperature of 60 to 180 DEG C for 10 to 96 h and carrying out rinsing, filtering, drying and roasting so as to obtain the composite molecular sieve containing a Y molecular sieve and a beta molecular sieve. According to the invention, the Y molecular sieve and the beta molecular sieve are synthesized in a same system, and uniform growth of the two molecular sieves and reasonable collocation of tunnel structures are realized, which is favorable for synergism between the Y molecular sieve and the beta molecular sieve.

Description

technical field [0001] The invention relates to a method for synthesizing Y / β composite molecular sieves in situ. Background technique [0002] Y molecular sieve and β molecular sieve have been widely used in petrochemical industry because of their unique pore structure, moderate acidity, good thermal stability and hydrothermal stability. Especially in petroleum processing processes such as catalytic cracking and hydrocracking where acid centers are the main reactive sites, Y molecular sieves and β molecular sieves are the most important catalyst components and catalyst supports. [0003] Composite molecular sieves are co-crystals formed by two or more molecular sieves, or composite crystals with structural characteristics of two or more molecular sieves. Composite molecular sieve synthesis technology provides a method for compounding different molecular sieves, which can synthesize new materials with special structures. The existing patented technology has disclosed a numb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/00C01B39/24
Inventor 李海岩窦涛张志华田然巩雁军孙发民张文成戴宝琴秦丽红王东青吕倩王甫村王妮妮关旭李群英
Owner PETROCHINA CO LTD
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