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A method for rapidly synthesizing ssz-13 zeolite molecular sieves

A technology of SSZ-13 and zeolite molecular sieves, which is applied in the direction of molecular sieve catalysts, molecular sieves and base exchange compounds, chemical instruments and methods, etc., can solve problems such as difficulty in widening large-scale industrial applications and expensive equipment, and shorten the synthesis cycle and reduce energy consumption. Consumption, accelerated growth effect

Active Publication Date: 2021-03-02
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, crystallization under microwave radiation needs to be carried out in a special reaction device, and the device is expensive, and it is still difficult to expand to large-scale industrial applications at this stage

Method used

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  • A method for rapidly synthesizing ssz-13 zeolite molecular sieves
  • A method for rapidly synthesizing ssz-13 zeolite molecular sieves
  • A method for rapidly synthesizing ssz-13 zeolite molecular sieves

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Mix 0.1632g aluminum isopropoxide, 0.0534g ammonium chloride and 2.954g N,N,N-trimethyl-1-adamantyl ammonium hydroxide solution, and stir magnetically at 450rpm until the solid is completely dissolved to become a clear liquid system; Add 2.083 g of tetraethyl orthosilicate to the obtained clear liquid system, and magnetically stir for 20 min to form a uniform gel system.

[0040] The homogeneous gel was transferred to a blast oven, and dried at 90° C. for 24 hours to promote moisture volatilization and transform into a secondary gel. Crush the secondary gel until the powder particles are less than 100 mesh.

[0041] The obtained powdery secondary gel is placed in a polytetrafluoroethylene-lined hydrothermal reaction kettle together with an open container containing a certain amount of deionized water for steam-assisted crystallization synthesis. direct contact. The reactor was heated to 160°C, and reacted for 7 hours under static conditions to complete the crystalliza...

Embodiment 2

[0044] Mix 0.1632g of aluminum isopropoxide, 0.02g of sodium hydroxide and 2.954g of N,N,N-trimethyl-1-adamantyl ammonium hydroxide solution, and mechanically stir at 400rpm until the solid is completely dissolved to become a clear liquid system; Tetraethyl orthosilicate was added to the clear liquid system, and mechanically stirred for 20 minutes to make a uniform gel system.

[0045] The obtained homogeneous gel is transferred to a blast oven and dried at 90°C for 24 hours to promote the volatilization of water and transform it into a secondary gel. After crushing the homogeneous gel, transfer it to a medium-high temperature environment with forced convection In order to promote the evaporation of water, so that the transformation into a secondary gel. Crush the secondary gel until the powder particles are less than 100 mesh.

[0046] The obtained powdery secondary gel and an open container containing a certain amount of deionized water are placed in a polytetrafluoroethyle...

Embodiment 3

[0050] (1) Mix 0.1632g aluminum isopropoxide, 0.02g sodium hydroxide and 2.954g N,N,N-trimethyl-1-adamantyl ammonium hydroxide solution, and stir magnetically at 400rpm until the solid is completely dissolved and becomes clear Liquid system; the obtained clear liquid system was added with 1.5g of silica sol, and magnetically stirred for 20min to make it called a homogeneous gel system.

[0051] Transfer the obtained homogeneous gel to a blast oven, and dry it at 90°C for 24 hours to promote the volatilization of water and transform it into a secondary gel, and pulverize the secondary gel until the powder particles are less than 100 mesh.

[0052] The obtained powdery secondary gel is placed in a polytetrafluoroethylene-lined hydrothermal reaction kettle together with an open container containing a certain amount of deionized water for steam-assisted crystallization synthesis. direct contact. The reactor was heated to 160°C and reacted for 25 hours under static conditions.

...

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Abstract

The invention provides a method for rapidly synthesizing SSZ-13 zeolite molecular sieves, using tetravalent silicon sources, trivalent aluminum sources, hydroxide ions, and inorganic cation sources as raw materials, and N,N,N-trimethyl- 1-adamantyl ammonium hydroxide solution is used as template agent, and SSZ-13 molecular sieve is synthesized by hydrothermal synthesis method. The method aims to provide a method for rapidly synthesizing SSZ‑13 type zeolite molecular sieves under conventional synthesis conditions without using crystal seeds. The fully crystallized SSZ-13 zeolite molecular sieve can be obtained in the shortest 7 hours through a special gel preparation route. The synthesized SSZ‑13 zeolite can be used for the catalytic conversion of methanol to light olefins and the removal of nitrogen oxides in exhaust gas of fuel machinery. Compared with the existing traditional hydrothermal synthesis method, the required time is greatly shortened, no waste water is generated in the process, and the yield of zeolite is higher.

Description

Technical field: [0001] The invention belongs to the field of molecular sieve synthesis, and in particular relates to a method for rapidly synthesizing SSZ-13 zeolite molecular sieves, which realizes the synthesis of high-silicon SSZ-13 molecular sieves with high space-time efficiency. Background technique: [0002] SSZ-13 molecular sieve has a relatively developed pore structure and good thermal stability due to its special ordered framework composition, and is an excellent adsorbent or catalyst carrier. Using Cu ion-exchanged SSZ-13 as a catalyst can be used for the selective reduction of ammonia (NH 3 -SCR or DeNOx) to eliminate nitrogen oxides in vehicle exhaust is an effective measure to reduce the emission of such air pollutants. Among many porous materials that can be used as DeNOx, SSZ-13 zeolite molecular sieve has been widely studied and commercially applied because of its low working temperature window and high conversion rate at large space velocity. SSZ-13 zeo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/48B01J29/70B01J35/02
CPCB01J29/7015B01J35/023B01J35/1023B01J35/1057C01B39/48C01P2004/62C01P2006/12C01P2006/16
Inventor 王卓鹏曾亮钢于志超
Owner NORTHEASTERN UNIV LIAONING
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