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High-silicon NaY molecular sieve as well as preparation method and application thereof

A molecular sieve, high-silicon technology, applied in separation methods, chemical instruments and methods, dispersed particle separation, etc., to achieve the effects of improving the silicon-aluminum ratio, reducing the difficulty of stirring, and reducing the synthesis cost

Pending Publication Date: 2020-03-06
SHANGHAI LVQIANG NEW MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, NaY molecular sieves are mostly used in catalytic cracking reactions, and seldom involve the application of VOCs adsorption, so further development is urgently needed

Method used

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  • High-silicon NaY molecular sieve as well as preparation method and application thereof
  • High-silicon NaY molecular sieve as well as preparation method and application thereof
  • High-silicon NaY molecular sieve as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0031] The required silicon source and aluminum source in all embodiments and comparative examples in the present invention are laboratory self-made, and the following is the preparation method:

[0032] Get 250ml modulus and be the water glass of 3.26 (Shanghai Jiangqiao Welding Rod Auxiliary Material Factory Co., Ltd., SiO 2 Content is 30.54wt%) in a beaker, then add 74.44ml deionized water, stir for 1h, add 3.5g sodium fluorosilicate (99.0wt%, Sinopharm reagent, appropriate amount of ammonium sulfate, ammonium chloride or ethyl acetate Can play the same effect), stirred at room temperature for 4h, named as water glass S-1 (SiO 2Content is 25.19wt%), as a silicon source.

[0033] Get 250ml modulus and be the water glass of 3.26 (Shanghai Jiangqiao Welding Rod Auxiliary Material Factory Co., Ltd., SiO 2 content is 30.54wt%) is placed in the beaker, then add 250ml deionized water, stir for 1h, add 3.5g ammonium sulfate (99.0wt%, Sinopharm reagent), named as water glass S-2 (...

Embodiment 2

[0044] Take 7.11g NaOH, dissolve it in 9.14g deionized water, after the dissolution is complete, add 12.36g A-1 type sodium metaaluminate, then slowly add this mixed solution into 50.52g S-2 water glass solution, stir well , aged at room temperature for 24 hours to obtain a guide gel.

[0045] Take 84.20g of S-2 water glass and place it in a beaker, add 11.19g of guide gel, stir evenly, then add 7.78g of aluminum sulfate, 16.36g of A-1 type sodium metaaluminate and 3.59g of deionized water, and stir Evenly, put it into a polytetrafluoroethylene kettle, crystallize at 100°C for 24 hours, wash and dry after the reaction, and it is identified as NaY molecular sieve by XRD, SiO 2 / Al 2 o 3 =6.75, BET specific surface area is 664.68m 2 / g, the particle size is about 750nm.

Embodiment 3

[0047] Take 7.69g NaOH, dissolve it in 28.74g deionized water, after the dissolution is complete, add 7.69g A-2 type sodium metaaluminate, then slowly add this mixed solution into 35.73g S-1 water glass solution, stir well , aged at room temperature for 24 hours to obtain a guide gel.

[0048] Take 59.54g of S-1 water glass and place it in a beaker, add 11.11g of guide gel, stir evenly, then add 7.10g of aluminum sulfate, 10.84g of A-2 sodium metaaluminate and 33.61g of deionized water, and stir Evenly, put it into a polytetrafluoroethylene kettle, crystallize at 100°C for 24 hours, wash and dry after the reaction, and it is identified as NaY molecular sieve by XRD, SiO 2 / Al 2 o 3 =5.84, BET specific surface area is 672.78m 2 / g, the particle size is about 750nm.

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Abstract

The invention relates to a preparation method of a high-silicon NaY molecular sieve, which comprises the following steps: S1. uniformly mixing pretreated water glass, aluminate, an alkali source and water at room temperature, standing at room temperature to 60 DEG C, and aging for 1-50 hours to obtain a guide gel; S2, adding guide gel to the pretreated water glass, then sequentially adding aluminate, aluminum salt and water, mixing the mixture to be uniform at the room temperature, obtaining a pre-reaction mixture, wherein the mass of the guide gel accounts for 1-15 wt% of the mass of the pre-reaction mixture; and S3, carrying out hydrothermal reaction on the pre-reaction mixture at 90-120 DEG C for 5-50 hours, filtering, washing and drying to obtain the NaY molecular sieve. Compared withthe prior art, the preparation method has the advantages that the water glass dispersion accelerant is added, so that the preparation of the high-silicon NaY molecular sieve and the uniform stirring of a low-alkalinity feeding system are facilitated; the prepared NaY molecular sieve is high in silica-alumina ratio, good in hydrothermal stability, large in pore diameter and high in specific surfacearea, and shows excellent performance in adsorption and removal of macromolecular VOCs.

Description

technical field [0001] The invention relates to the field of molecular sieve preparation, in particular to a high-silicon NaY molecular sieve and its preparation method and application. Background technique [0002] At present, Y-type molecular sieves, which are widely used in the adsorption of VOCs organic gases and heavy oil cracking catalysts, all need to be subjected to high-temperature hydrothermal and high-temperature gas phase reactions on the basis of conventional NaY molecular sieves for secondary synthesis of dealumination and silicon supplementation. Increasing the silicon-aluminum ratio significantly enhances its hydrophobicity and hydrothermal stability. US4036739 utilizes fluorosilicate or SiCl 4 The conventional NaY is dealuminated and silicon supplemented to obtain ultra-stable Y zeolite. CN104261426 uses ammonium fluoroborate for ion exchange, and after high-temperature hydrothermal treatment, reacts with a solution prepared with polyacrylic acid and silic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/24B01D53/02
CPCC01B39/24B01D53/02B01D2257/708B01D2253/1085
Inventor 汪莹莹王鹏飞徐华胜李春成张佳张伏军陈诚
Owner SHANGHAI LVQIANG NEW MATERIALS CO LTD
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