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High-silicon small-grain Y-type molecular sieve as well as template-free preparation method and application of same

A small-grain, molecular sieve technology, applied in molecular sieve catalysts, catalyst activation/preparation, chemical instruments and methods, etc., can solve problems such as difficulty in popularization and application

Active Publication Date: 2021-06-11
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In industry, the crystallization time of Y-type molecular sieve is generally less than 24 hours, so it is difficult to popularize and apply in subsequent industries

Method used

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  • High-silicon small-grain Y-type molecular sieve as well as template-free preparation method and application of same
  • High-silicon small-grain Y-type molecular sieve as well as template-free preparation method and application of same
  • High-silicon small-grain Y-type molecular sieve as well as template-free preparation method and application of same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] This embodiment provides a high-silicon small-grain Y-type molecular sieve, which is prepared through the following steps:

[0073] 1) According to the molar ratio is Na 2 O: Al 2 o 3 :SiO2 2 :H 2 O=15:1:15:320 to prepare the directing agent

[0074] Under the condition that the temperature of the water bath is 34°C, dissolve 0.05 mol of aluminum sulfate and 1.50 mol of sodium hydroxide in 6 mol of deionized water and stir until completely dissolved to obtain the first mixture, and dissolve 0.75 mol of sodium silicate in 6 Stir in 1 mole of deionized water until completely dissolved to obtain the second mixture, mix the first mixture and the second mixture evenly, add 4 moles of deionized water, stir for 30 minutes, seal and age for a day and night to obtain the directing agent (the directing agent is colloidal) ;

[0075] 2) Prepare mother liquor

[0076] At a water bath temperature of 50°C, dissolve 4.50 moles of sodium hydroxide, 0.86 moles of aluminum sulfate...

Embodiment 2

[0082] This embodiment provides a high-silicon small-grain Y-type molecular sieve, which is prepared by the following steps:

[0083] 1) According to the molar ratio is Na 2 O: Al 2 o 3 :SiO2 2 :H 2 O=15:1:15:320 prepares the directing agent, specifically:

[0084] Under the condition that the temperature of the water bath is 36°C, dissolve 0.05 mol of aluminum sulfate and 1.50 mol of sodium hydroxide in 6 mol of deionized water and stir until completely dissolved to obtain the first mixture, and dissolve 0.75 mol of sodium silicate in 6 Stir in 1 mole of deionized water until completely dissolved to obtain the second mixture, mix the first mixture and the second mixture evenly, add 4 moles of deionized water, stir for 30 minutes, seal and age for a day and night to obtain the directing agent (the directing agent is colloidal) ;

[0085] 2) Prepare mother liquor

[0086] At a water bath temperature of 55°C, dissolve 7.5 moles of sodium hydroxide, 0.90 moles of aluminum ...

Embodiment 3

[0092] 1) According to the molar ratio is Na 2 O: Al 2 o 3 :SiO2 2 :H 2 O=16:1:15:320 prepares the directing agent, specifically:

[0093] Under the condition that the temperature of the water bath is 34°C, dissolve 0.05 mol of aluminum sulfate and 1.60 mol of sodium hydroxide in 6 mol of deionized water and stir until completely dissolved to obtain the first mixture, and dissolve 0.75 mol of sodium silicate in 6 Stir in 1 mole of deionized water until completely dissolved to obtain the second mixture, mix the first mixture and the second mixture evenly, add 4 moles of deionized water, stir for 30 minutes, seal and age for a day and night to obtain the directing agent (the directing agent is colloidal) ;

[0094] 2) Prepare mother liquor

[0095] At a water bath temperature of 50°C, dissolve 6.4 moles of sodium hydroxide, 0.86 moles of aluminum sulfate and 0.17 moles of nickel nitrate in 84 moles of deionized water and stir until fully dissolved to obtain a third mixture...

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Abstract

The invention provides a high-silicon small-grain Y-type molecular sieve as well as a template-free preparation method and application of same. The preparation method comprises the following steps: mixing an aluminum source, an alkali source and water to obtain a first mixture, mixing a silicon source and water to obtain a second mixture, uniformly mixing the first mixture and the second mixture, adding water, and aging the mixture to obtain a guiding agent; mixing an alkali source, an aluminum source, a heteroatom source and water to obtain a third mixture, mixing a silicon source and water to obtain a fourth mixture, and mixing the third mixture and the fourth mixture to prepare mother liquor; adding the mother liquor into the guiding agent to prepare gel; and aging the gel, carrying out a crystallization reaction at 70-130 DEG C until a solid phase and a liquid phase are separated, washing the solid phase, carrying out suction filtration, and drying the solid to obtain the high-silicon small-grain Y-type molecular sieve. The molecular sieve prepared by the preparation method can effectively catalyze the catalytic cracking reaction of 1,3,5-triisopropylbenzene.

Description

technical field [0001] The invention relates to a small-grain Y-type molecular sieve with a high silicon-aluminum ratio and a preparation method thereof, belonging to the technical field of preparation of molecular sieve catalysts. Background technique [0002] The main active components of Y-type zeolite catalysts, the influence of crystallinity, silicon-aluminum ratio, pore structure and grain size on the catalytic performance have always been concerned by people. [0003] At present, the silicon-aluminum ratio of Y-type zeolite synthesized by conventional methods is about 4.8-5.0, and the unit cell constant is about 2.4654nm, which is called conventional Y-type zeolite. The ratio of silicon to aluminum in the framework of Y-type zeolite plays an important role in its catalytic performance. But high silicon Y-type zeolite (SiO 2 / Al 2 o 3 >5.0) is difficult to synthesize, especially the high-silicon Y-type zeolite with a silicon-aluminum ratio greater than 6.0. Thi...

Claims

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Application Information

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IPC IPC(8): C01B39/24B01J29/08B01J29/14B01J37/08B01J37/30
CPCC01B39/24B01J29/084B01J29/146B01J37/30B01J37/08C01P2006/12C01P2006/14C01P2004/62C01P2002/72
Inventor 任申勇孟波申宝剑郭巧霞
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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