Mesoporous Y-type zeolite molecular sieve and preparation method thereof

A zeolite molecular sieve and mesoporous technology, applied in the direction of crystalline aluminosilicate zeolite, octahedral crystalline aluminosilicate zeolite, etc., can solve the problems of complex preparation steps, unfavorable industrial production, and high synthesis cost, and achieve simple preparation process and low cost. The effect of low and simplified synthesis steps

Inactive Publication Date: 2013-07-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These research results have realized the pore structure of multi-stage molecular sieves. The material contains both mesopores and crystallized pore wall structures. However, these methods are too expensive to synthesize and have complicated preparation steps, which are not conducive to industrial production.

Method used

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  • Mesoporous Y-type zeolite molecular sieve and preparation method thereof
  • Mesoporous Y-type zeolite molecular sieve and preparation method thereof
  • Mesoporous Y-type zeolite molecular sieve and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) 5.425g of sodium hydroxide, 1.065g of sodium metaaluminate (44.7 wt% Na 2 O, 52.0 wt% Al 2 o 3 ), 22.511g of water glass (modulus 3.1), and 42.5ml of water were mixed evenly, aged at 30°C for 24h to obtain a Y-type zeolite directing agent.

[0031] (2) Mix 29.0ml of water glass (modulus 3.1), 3.0ml of water, and 4.0ml of the directing agent prepared in step (1) at room temperature. After stirring for 1 hour, add 3.5ml of TPOAC (60 wt% , J￡K) was added slowly and continued to stir for 2h. Finally, 5.0 ml of aluminum sulfate octadecahydrate (24 wt%) aqueous solution and 6.0 ml of mixed aqueous solution of sodium metaaluminate and sodium hydroxide (17.8 wt% NaAlO 2 , 9.5 wt% NaOH), stirred at room temperature for 1 h to obtain a viscous aluminosilicate gel.

[0032] (3) Put the material produced in step (2) into a sealed stainless steel reaction kettle, and crystallize at 90°C for 24 hours. The organic template was removed by calcining at ℃ for 8 hours to obtain a...

Embodiment 2

[0034] (1) 6.0g of sodium hydroxide, 1.5g of sodium metaaluminate (44.7 wt% Na 2 O, 52.0 wt% Al 2 o 3 ), 21.0g of water glass (modulus 3.4), and 45.0ml of water were mixed evenly, aged at 35°C for 48h to obtain a Y-type zeolite directing agent.

[0035] (2) Mix 35.0ml of water glass (modulus 3.4), 6.0ml of water, and 7.0ml of the directing agent prepared in step (1) at room temperature. After stirring for 4 hours, add 5.0ml of TPOAC (60 wt% , J￡K) was added slowly and continued to stir for 6h. Finally, 7.5 ml of aluminum sulfate octadecahydrate (24 wt%) aqueous solution and 8.0 ml of mixed aqueous solution of sodium metaaluminate and sodium hydroxide (17.8 wt% NaAlO 2 , 9.5 wt% NaOH), stirred at room temperature for 3 h to obtain a viscous aluminosilicate gel.

[0036] (3) Put the material produced in step (2) into a sealed stainless steel reaction kettle, and crystallize at 110°C for 60 hours. The organic template is removed by roasting at ℃ for 5 hours, so as to obtain ...

Embodiment 3

[0038] (1) Mix 8.0g of sodium hydroxide, 2.5g of sodium metaaluminate (44.7 wt% Na 2 O, 52.0 wt% Al 2 o 3 ), 23.0g of water glass (modulus 3.2), and 50.0ml of water were mixed evenly, aged at 32°C for 36h to obtain a Y-type zeolite directing agent.

[0039] (2) Mix 32.0 ml of water glass (modulus 3.2), 5.0 ml of water, and 6.0 ml of the directing agent prepared in step (1) at room temperature. After stirring for 2.5 hours, add 4.0 ml of TPOAC (60 wt % , J￡K) was added slowly and continued to stir for 5h. Finally, 6.0 ml of aluminum sulfate octadecahydrate (24 wt%) aqueous solution and 7.5 ml of mixed solution of sodium metaaluminate and sodium hydroxide (17.8 wt% NaAlO 2 , 9.5 wt% NaOH), stirred at room temperature for 2 h to obtain a viscous aluminosilicate gel.

[0040] (3) Put the material produced in step (2) into a sealed stainless steel reaction kettle, and crystallize at 100°C for 40 hours. The organic template was removed by calcining at ℃ for 8 hours to obtain a ...

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Abstract

The invention discloses a mesoporous Y-type zeolite molecular sieve and a preparation method thereof. The preparation method comprises the following steps of: firstly preparing a Y-type zeolite guiding agent; and then guiding synthesis of the mesoporous Y-type zeolite molecular sieve by using amphiphilic organosilane N,N-dimethyl-N-[3-(trimethoxysilane)propyl]octadecyl ammonium chloride (TPOAC) as a mesoporous template, wherein siloxane group at the organosilane terminal is firstly hydrolyzed into silicon hydroxyl; then the silicon hydroxyl is linked to a skeleton on the zeolite surface through chemical bonds; and other alkyl terminals are polymerized and then participate in pore expansion. According to the method disclosed by the invention, mesoporous zeolites can be synthesized by using a one-step hydrothermal process; the method is simple in preparation process, easy to operate and low in cost and good in connectivity between mesopores and micropores, and facilitates macromolecular diffusion. As the prepared mesoporous zeolite molecular sieve has the mesopores and the micropores, the defect of a single pore structure is avoided; and the mesoporous Y-type zeolite molecular sieve has broad application prospect in the catalytic field, in particular in macromolecular diffusion-limited reaction.

Description

technical field [0001] The invention relates to a molecular sieve and a preparation method thereof, in particular to a method for preparing a Y-type zeolite molecular sieve containing a mesoporous structure by using organosilane as a mesoporous template. Background technique [0002] The Si / Al ratio of Y-type molecular sieve is generally between 1.5 and 3. It belongs to the faujasite type (FAU) molecular sieve and has a three-dimensional twelve-membered ring channel structure with a diameter of about 0.74 nm. Due to its unique pore structure, suitable acidity and thermal stability, Y-type molecular sieves are widely used in the petrochemical industry, especially in fluid catalytic cracking (FCC) reactions [Stao K. Nishimura Y. Honna K. Matsubayashi N. Shimada H. Role of HY Zeolite Mesopores in Hydrocracking of Heavy Oils. J. Catal, 2001, 200(2): 288-297]. However, due to the relatively narrow pore structure of Y-type zeolite molecular sieves, it is difficult for heavy oil m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/24
Inventor 刘宝玉奚红霞段倩倩陈菲
Owner SOUTH CHINA UNIV OF TECH
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