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A kind of y and zsm-35 composite molecular sieve and its synthesis method

A technology of ZSM-35 and composite molecular sieve, which is applied in molecular sieve catalysts, chemical instruments and methods, and other chemical processes. Decrease in crystallinity, improve catalytic activity, and improve physical and chemical properties

Active Publication Date: 2017-01-11
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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  • A kind of y and zsm-35 composite molecular sieve and its synthesis method
  • A kind of y and zsm-35 composite molecular sieve and its synthesis method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035](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.

[0036] (2) Dissolve 40 g of glucose in 100 mL of distilled water, add 8 g of ZSM-35 molecular sieves into the glucose solution under stirring, stir for 30 min, place the mixture in an ultrasonic cleaner for 2 h, and then The mixture was filtered, and the obtained product was dried at 120 °C for 12 h, and then calcined at 500 °C for 2 h in a nitrogen atmosphere to obtain a pretreated ZSM-35 molecular sieve.

[0037] (3) Dissolve 0.36 g of sodium aluminate and 0.7 g of sodium hydroxide in 50 mL of distilled water until completely dissolved; then add 2 mL of the Y structure-directing agent obtained in step (1), and stir for 30 min; then add 1.5 g of the step (2 ) obtained ZSM-35 molecular sieve, and then put the mixtu...

Embodiment 2

[0039] (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.

[0040] (2) Dissolve 40 g of glucose in 100 mL of distilled water, add 8 g of ZSM-35 molecular sieves into the glucose solution under stirring, stir for 30 min, place the mixture in an ultrasonic cleaner for 2 h, and then The mixture was filtered, and the obtained product was dried at 120 °C for 12 h, and then calcined at 550 °C for 2 h in a nitrogen atmosphere to obtain a pretreated ZSM-35 molecular sieve.

[0041] (3) Dissolve 0.5 g of sodium aluminate and 0.8 g of sodium hydroxide in 50 mL of distilled water until completely dissolved; then add 2.5 mL of the Y structure-directing agent obtained in step (1), and stir for 30 min; then add 1.5 g of the Y structure-directing agent obtained in step (2 ) obtained ZSM-...

Embodiment 3

[0043] (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.

[0044] (2) Dissolve 35 g of glucose in 100 mL of distilled water, add 7 g of ZSM-35 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 place the mixture After filtering, the obtained product was dried at 120° C. for 12 hours, and then calcined at 550° C. for 1.5 hours in a nitrogen atmosphere to obtain a pretreated ZSM-35 molecular sieve.

[0045] (3) Dissolve 0.36 g of sodium aluminate and 0.7 g of sodium hydroxide in 50 mL of distilled water until completely dissolved; then add 2 mL of the Y structure-directing agent obtained in step (1), and stir for 30 min; then add 1.7 g of the step (2 ) obtained ZSM-35 molec...

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Abstract

The invention provides a Y / ZSM-35 composite molecular sieve with two crystal forms of a Y type molecular sieve and a ZSM-35 molecular sieve. The invention also provides a synthesizing method of the Y / ZSM-35 composite molecular sieve. The method comprises the following steps: (1) a Y structure-directing agent is prepared; (2) a ZSM-35 molecular sieve is added into a glucose solution and is subjected to pretreatment; (3) a silicon source, an aluminum source, an alkali source, water, the Y structure-directing agent and the treated ZSM-35 molecular sieve are mixed; and crystallization is carried out, such that the Y / ZSM-35 composite molecular sieve is obtained. According to the invention, glucose is introduced into micro-pore channels of the ZSM-35 molecular sieve, and is converted into carbon through roasting, such that the channels of the ZSM-35 molecular sieve are occupied, and alkali is prevented from entering the crystals of the ZSM-35 molecular sieve. Therefore, the ZSM-35 molecular sieve is not damaged during the crystallization reaction process, crystal structure integrity is maintained, and the physical and chemical properties and the catalytic activity of the Y / ZSM-35 composite molecular sieve can be improved.

Description

technical field [0001] The invention belongs to the field of synthesis of molecular sieve catalytic materials, in particular to a Y / ZSM-35 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, CN101618884A discloses a preparation method of Magadiite / ZSM-35 eutectic molecular sieve. Molecular si...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/44B01J20/18B01J29/80
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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