Surface-rich modified y molecular sieve with mesopores and preparation method thereof

A molecular sieve and modification technology, applied in the direction of molecular sieves and alkali exchange compounds, chemical instruments and methods, octahedral crystalline aluminum silicate zeolite, etc., can solve the problem of sensitive dealumination conditions, difficult to control, and difficult catalysts with the same degree of dealumination on the surface and other problems, to achieve the effect of cheap raw materials and simple and easy process

Active Publication Date: 2021-05-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The dealumination process of molecular sieves is a complex and difficult to control process. The removal of aluminum is very sensitive to dealumination conditions, and it is difficult to achieve the same degree of dealumination on the surface of the catalyst as in the bulk phase. Usually, the aluminum on the surface of molecular sieves is easier to remove, while To remove the aluminum in the bulk phase of the molecular sieve, more severe dealumination conditions are required, which will cause the collapse of the molecular sieve skeleton structure and the destruction of the micropores. The structure and acid properties have a great influence

Method used

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  • Surface-rich modified y molecular sieve with mesopores and preparation method thereof
  • Surface-rich modified y molecular sieve with mesopores and preparation method thereof
  • Surface-rich modified y molecular sieve with mesopores and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060]642.44 g of a high-aluminum sodium aluminate solution was added to 866.51 g of water glass, and the stirred agitate at room temperature at room temperature for 48 hours, then stretched at 60 ° C for 5 hours, and finally ginsen 195 g of stirring. Deion water, get the molar group into 15na2O: A12O3: 15sio2: 320h2O The guiding agent.

[0061]The above-described guide agent 348.4 g and 12.63 g of the first silicon source colloidal silica was mixed at room temperature and high-speed stirring (rotational speed of 900 r / min), and stirring was continued for 30 min to give the first mixture, and then stirred at room temperature and high speed Under the conditions, the first mixture, 508.14 g of the second silicon source water glass, 43.10 g of aluminum source low aluminum sodium aluminate solution, 286.5 g of aluminum sulfate and 166.5 g of aluminum sulfate and 166.5 g of water were added to the mixed tank to give moles. Formation into 2.7na2O: a12O3: 8.6sio2: 259h2The second mixture of...

Embodiment 2

[0063]642.44 g of a high aluminum sodium aluminate solution was mixed with 866.51 g of water glass, and stirred at room temperature at room temperature for 48 hours, then deposition at 60 ° C for 5 hours, and finally ginsen 195 g of stirring. Deion water, get the molar group into 15na2O: A12O3: 15sio2: 320h2O The guiding agent.

[0064]The above-described guide agent 311.6 g and 12.63 g of the first silicon source colloidal silica was mixed at room temperature and high-speed stirring (rotational speed of 900 r / min, and stirring was continued for 60 min to give the first mixture, and then stirred at room temperature and high speed Under the conditions of (rotational speed of 1200R / min), the first mixture, 441.37 g of the second silicon source water glass, 40.00 g of aluminum source low-aluminum aluminate solution, 251.00 g of aluminum sulfate and 200.63 g of aluminum sulfate and 200.63 g of water joined In the mixing tank, the molar group is 2.7NA2O: A12O3: 8.6sio2: 269h2The second ...

Embodiment 3

[0066]The 164.54 g of a high aluminum sodium aluminate solution was mixed with 291.37 g of water glass, and agitated at 30 ° C for 20 hours, then deposition at 40 ° C for 15 hours, and finally add 60 g of deionization under stirring. Water, get the molar group to become 20na2O: A12O3: 20sio2: 380h2O The guiding agent.

[0067]The above-described guide agent 515.91 g from 592.62 g of the first silicon source water glass was mixed with a conternitude manner to obtain a first mixture, and then stirred (rotational speed 900R) Under the position of the first mixture, 500 g of the second silicon source water glass, 166.31 g of aluminum source low aluminum aluminate solution, 332.87 g Aluminum sulfate and 479.4 g of aluminum sulfate Water, get the molar group to become 4na2O: A12O3: 9sio2: 220h2The second mixture of O. SIO2The weight ratio of the first silicon source and the second silicon source is 1: 0.83, and the addition amount of the guide agent is calculated from 10% of the mole of alum...

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Abstract

The present disclosure relates to a modified Y molecular sieve whose surface is rich in mesopores and a preparation method thereof. The bulk phase SiO of the modified Y molecular sieve 2 / Al 2 o 3 The molar ratio is 10.0~13.0, the total pore volume of BET method is not less than 0.38cm 3 / g, BET method secondary pore volume not less than 0.06cm 3 / g, unit cell parameters: a=b=c=2.44-2.46nm, based on the total weight of the modified Y molecular sieve, the content of sodium oxide in the modified Y molecular sieve is not more than 0.1% by weight. The modified Y molecular sieve has larger surface mesopore volume than conventional Y molecular sieves.

Description

Technical field[0001]The present disclosure relates to a modified Y molecular sieve and preparation method thereof in a surface-rich mesenchymal.Background technique[0002]In the end of the fifty-year, Milton and BRECK successfully synthesized Y-type molecular sieves, SiO in the structure of NAY molecular sieve2 / Al2O3It is better than the X-type molecular sieve to improve its thermal stability and water stability. In the 1970s, GRACE has developed the guiding agent to synthesize NAY molecular sieves. The raw materials replace expensive silica sol by water glass, and the process is simplified, and the growth cycle is shorter, which makes NAY molecular sieves and widely applied to petrochemicals, especially Petroleum cracking catalytic field. So far, in the hundreds of molecular sieves that have been developed, the largest use is the greatest use of Y molecular sieves. At present, the synthesis of NAY molecular sieves is mainly used in industrialization. Due to the use and improvement...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/24C01B39/02
CPCC01B39/026C01B39/24C01P2002/01C01P2004/04C01P2006/14
Inventor 付强李永祥张成喜胡合新慕旭宏舒兴田
Owner CHINA PETROLEUM & CHEM CORP
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