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Small-particle Y-type molecular sieve with silicon-enriched surface and preparation method thereof

A surface silicon-rich, molecular sieve technology, applied in octahedral crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., can solve the problems of poor thermal and hydrothermal stability, small batch size, and low activity

Active Publication Date: 2015-11-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN1382632A discloses a super-stabilizing method of small-grain Y-type zeolite, which is obtained by contacting the dry gas of silicon tetrachloride with small-grain NaY zeolite and washing it. Stability is just relatively poor, and this inventive method adopts the mode of vapor phase dealumination of silicon to process molecular sieve simultaneously, and this makes the thermal and hydrothermal stability of product worse, and activity is low; Small, high energy consumption and other disadvantages

Method used

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  • Small-particle Y-type molecular sieve with silicon-enriched surface and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] This example illustrates the synthesis process of small crystal NaY molecular sieves.

[0034] 50.39g high alkali sodium metaaluminate solution (provided by Sinopec Catalyst Changling Branch, Al 2 o 3 The content is 40.2g / L, Na 2 O content is 255g / L, specific gravity is 1.324) joins 65.56g water glass (Sinopec Catalyst Changling Branch provides, SiO 2 The content is 260.6g / L, Na 2 The O content is 81.6g / L, the specific gravity is 1.2655, and the modulus is 3.3), aged with stirring at room temperature for 48 hours, then statically aged at 60°C for 5 hours, and finally added 15g of deionized water, the resulting directing agent has a final molar ratio of 15Na 2 O: A1 2 o 3 :15SiO2 2 :320H 2 O.

[0035] All the directing agents prepared were used in the preparation of the following reaction mixture, and the amount of the directing agent added was calculated according to the fact that the moles of aluminum in the directing agent accounted for 3% of the total moles ...

Embodiment 2

[0046] This example illustrates the synthesis process of small crystal NaY molecular sieves.

[0047] 50.39g high alkali sodium metaaluminate solution (provided by Sinopec Catalyst Changling Branch, Al 2 o 3 The content is 40.2g / L, Na 2 O content is 255g / L, specific gravity is 1.324) joins 65.56g water glass (Sinopec Catalyst Changling Branch provides, SiO 2 The content is 260.6g / L, Na 2 The O content is 81.6g / L, the specific gravity is 1.2655, and the modulus is 3.3), aged with stirring at 60°C for 5 hours, then statically aged at 60°C for 5 hours, and finally added 15g of Ionized water, the final molar ratio of the resulting directing agent is 15Na 2 O: A1 2 o 3 :15SiO2 2 :320H 2 O.

[0048] All the directing agents prepared were used in the preparation of the following reaction mixture, and the amount of the directing agent added was calculated according to the fact that the moles of aluminum in the directing agent accounted for 3% of the total moles of aluminum. ...

Embodiment 3

[0059] This example illustrates the synthesis process of small crystal NaY molecular sieves.

[0060] With 164.54g high alkali sodium metaaluminate solution (Sinopec Catalyst Changling Branch Company provides, Al 2 o 3 The content is 40.2g / L, Na 2 O content is 340g / L, specific gravity is 1.297) joins 291.37g water glass (Sinopec Catalyst Changling Branch provides, SiO 2 The content is 260.6g / L, Na 2 The O content is 81.6g / L, the specific gravity is 1.2655, and the modulus is 3.3), aged with stirring at 30°C for 20 hours, then statically aged at 40°C for 15 hours, and finally added 60g of ionized water. The resulting directing agent has a final molar ratio of 20Na 2 O: A1 2 o 3 :20SiO2 2 :380H 2 O.

[0061] All the directing agents prepared were used in the preparation of the following reaction mixture. The amount of the directing agent added was calculated according to the fact that the moles of aluminum in the directing agent accounted for 10% of the total moles of ...

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Abstract

The invention provides a small-particle Y-type molecular sieve with a silicon-enriched surface. The molecular sieve is characterized in that the molar ratio of SiO2 / Al2O3 of a phase skeleton of the molecular sieve body is 5.0-6.0, the molar ratio of SiO2 / Al2O3 of the surface is 8.0-13.0, the cell parameter is 2.46-2.468nm, the weight content of sodium oxide is less than or equal to 0.1 wt%, and the average diameter of crystal grains is 50-800nm.

Description

technical field [0001] The invention relates to a Y-type molecular sieve and a preparation method thereof, in particular to a preparation method of a Y-type molecular sieve with silicon-rich surface and small grains. Background technique [0002] In the late 1950s, Milton and Breck successfully synthesized Y-type molecular sieves. Due to the SiO in the structure of the Y-type molecular sieve 2 with Al 2 o 3 The ratio is greater than that of X-type molecular sieve, so that the thermal stability and hydrothermal stability are improved. In the early 1970s, Grace Company developed the directing agent method to synthesize NaY molecular sieves. The raw material was water glass instead of expensive silica sol. The process was simplified and the growth cycle was shortened, so that NaY molecular sieves were rapidly and widely used in petrochemical industries Petroleum cracking catalysis field. So far, among the hundreds of molecular sieves that have been developed, Y-type molecu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/24
Inventor 付强李永祥胡合新慕旭宏舒兴田
Owner CHINA PETROLEUM & CHEM CORP
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