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Beta-Y composite molecular sieve and synthetic method thereof

A composite molecular sieve and molecular sieve technology, applied in the direction of molecular sieves and base exchange compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of difficult control of the composite structure, affecting the adsorption and catalytic performance, and the destruction of the first component, etc., to achieve improvement Physicochemical properties and catalytic activity, the effect of avoiding the decrease of crystallinity and maintaining integrity

Active Publication Date: 2015-05-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] However, there are still many defects and deficiencies in the synthesis technology of composite molecular sieves, which cause some deficiencies in the physical and chemical properties of composite molecular sieves.
For example, the composite structure of composite molecular sieves is not easy to control, and the acid properties are also difficult to adjust.
Moreover, many composite molecular sieves are synthesized by a two-step method, which easily causes damage to the first component during the compounding process, which reduces the physical and chemical properties of the composite molecular sieve, thereby affecting the adsorption and catalytic performance.

Method used

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  • Beta-Y composite molecular sieve and synthetic method thereof
  • Beta-Y composite molecular sieve and synthetic method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0036] (1) Dissolve 3.56 g of sodium hydroxide and 1.33 g of sodium aluminate in 24 mL of distilled water, add 11 mL of water glass to it after the dissolution is complete, then stir until uniform, and stand at 35 °C for 24 h to obtain Y Structure directing agent.

[0037] (2) Dissolve 40 g of glucose in 100 mL of distilled water, and add 8 g of Beta molecular sieves into the glucose solution under stirring conditions. After stirring for 30 min, place the mixture in an ultrasonic cleaner for 2 h, and then put the mixture into After filtration, the obtained product was dried at 120°C for 12 hours, and then calcined at 500°C for 2 hours in a nitrogen atmosphere to obtain a pretreated Beta molecular sieve.

[0038] (3) Dissolve 1.5 g of sodium aluminate and 3 g of sodium hydroxide in 50 mL of distilled water until completely dissolved, then add 4 g of white carbon black to it under stirring, and stir for 25 minutes; then add step (1) to obtain 2 mL of Y structure-directing agent...

Embodiment 2

[0041] (1) Dissolve 3.56 g of sodium hydroxide and 1.33 g of sodium aluminate in 24 mL of distilled water, add 11 mL of water glass to it after the dissolution is complete, then stir until uniform, and stand at 35 °C for 24 h to obtain Y Structure directing agent.

[0042] (2) Dissolve 40 g of glucose in 100 mL of distilled water, and add 8 g of Beta molecular sieves into the glucose solution under stirring conditions. After stirring for 30 min, place the mixture in an ultrasonic cleaner for 2 h, and then put the mixture into After filtration, the obtained product was dried at 120°C for 12 hours, and then calcined at 500°C for 2 hours in a nitrogen atmosphere to obtain a pretreated Beta molecular sieve.

[0043] (3) Dissolve 1.5 g of sodium aluminate and 3.5 g of potassium hydroxide in 50 mL of distilled water until completely dissolved, then add 4 g of silica gel to it under stirring, and stir for 25 minutes; then add the Y structure obtained in step (1) Directing agent 2.5 ...

Embodiment 3

[0046] (1) Dissolve 4.02 g of sodium hydroxide and 1.5 g of sodium aluminate in 25 mL of distilled water, add 11 mL of water glass to it after the dissolution is complete, then stir until uniform, and stand at 35°C for 20 hours to obtain the Y structure Directing agent.

[0047] (2) Dissolve 35 g of glucose in 100 mL of distilled water, add 7 g of Beta molecular sieve into the glucose solution under stirring conditions, stir for 30 min, place the mixture in an ultrasonic cleaner for 2 h, and then filter the mixture , the obtained product was dried at 120° C. for 12 h, and then calcined at 550° C. for 1.5 h in a nitrogen atmosphere to obtain a pretreated Beta molecular sieve.

[0048] (3) Dissolve 2.5 g of aluminum nitrate and 2.8 g of sodium hydroxide in 50 mL of distilled water until completely dissolved, then add 5 g of white carbon black to it with stirring, and stir for 30 minutes; then add the Y structure directing agent 1.5 mL, stirred for 30 min;

[0049] (4) Add 3 g ...

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Abstract

The invention provides a Beta-Y composite molecular sieve. The Beta-Y composite molecular sieve has the following two crystal forms at the same time: a Y type molecular sieve and a Beta molecular sieve. The invention also provides a synthetic method for the Beta-Y composite molecule sieve. The synthetic method comprises the following steps: (1) preparing a Y structure-directing agent; (2) adding the Beta molecular sieve into a glucose solution for pretreatment; (3) mixing a silicon source, an aluminum source, inorganic base and water and adding the Y structure-directing agent; and (4) adding the treated Beta molecular sieve under stirring, carrying out crystallization and then carrying out separating, washing, drying and roasting so as to obtain the Beta-Y composite molecular sieve. According to the invention, glucose is introduced into the micro pore channels of the Beta molecular sieve and becomes carbon after roasting; the carbon occupies the pore channels of the Beta molecular sieve to prevent alkali from entering the interior of Beta molecular sieve crystals, so the Beta molecular sieve is not destroyed in the process of crystallization and the integrity of crystal structure is maintained, which are beneficial for improvement of the physical and chemical properties and the catalytic activity of the Beta-Y composite molecular sieve.

Description

technical field [0001] The invention belongs to the field of synthesis of molecular sieve catalytic materials, and relates to a composite molecular sieve and a synthesis method thereof, in particular to a Beta-Y composite molecular sieve and a synthesis method thereof. Background technique [0002] Composite molecular sieve is a composite molecular sieve with a special structure, which is a co-crystal formed by two or more molecular sieves, or a composite crystal with the structural characteristics of two or more molecular sieves. Due to the particularity of the composite molecular sieve structure, this molecular sieve has a more reasonable distribution of acidity and good hydrothermal stability, overcomes the limitations of its components, better meets the needs of industrial applications, and has a wide range of applications. Application prospect. [0003] At present, there are many technologies about composite molecular sieves. For example, CN1583562A discloses a double ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/46C01B39/24
CPCC01B39/023C01P2002/72C01P2006/12
Inventor 范峰凌凤香王少军张会成陈晓刚杨春雁
Owner CHINA PETROLEUM & CHEM CORP
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