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Double micro pore high silicon composite molecular sieve and its preparing method

A molecular sieve and high-silicon technology, applied in the direction of crystalline aluminosilicate zeolite, octahedral crystalline aluminosilicate zeolite, etc., can solve the problems of difficult post-treatment process and poor hydrothermal stability, and achieve good thermal and hydrothermal stability Effect

Inactive Publication Date: 2007-04-11
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The inventor has successfully prepared Y / Beta and Beta / Y composite molecular sieve catalytic materials (patent application numbers: 200410012333.2 and 200410012336.6), but due to poor hydrothermal stability, it has brought certain difficulties to the post-treatment process

Method used

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  • Double micro pore high silicon composite molecular sieve and its preparing method
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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0015] In the first step, mix 13.0g of high-silicon Y zeolite powder and 90.0ml of NaOH (0.10mol / L) evenly, stir with magnetic force for 1 hour, put the mixed solution into a 150ml stainless steel reaction kettle, and dissolve it in alkali at 180°C for 3 hours . Obtain a high-silicon Y zeolite whose crystallinity decreases after alkali dissolution;

[0016] In the second step, the obtained high-silicon Y zeolite whose crystallinity is reduced after alkali dissolution is centrifuged with a centrifuge, and the supernatant is removed;

[0017] The 3rd step adds 0.6g sodium hydroxide on the basis of the high silicon Y zeolite that crystallinity reduces after the alkali dissolution that makes, 10.0gTEABr (tetraethylammonium bromide), 10.0ml strong ammoniacal liquor, 28.0ml silica sol ( [SiO 2 ]=5.80mol / L), 16.0ml of distilled water were mixed and stirred into a uniform white jelly, put into a 150ml stainless steel reaction kettle, crystallized at 140°C for 6 days, taken out, wash...

Embodiment approach 2

[0019] In the first step, mix 13.0g of high-silicon Y zeolite powder and 90.0ml of NaOH (0.10mol / L) evenly, stir with magnetic force for 1 hour, put the mixed solution into a 150ml stainless steel reaction kettle, and dissolve it in alkali at 175°C for 4 hours . Obtain a high-silicon Y zeolite whose crystallinity decreases after alkali dissolution;

[0020] In the second step, the obtained high-silicon Y zeolite whose crystallinity is reduced after alkali dissolution is centrifuged with a centrifuge, and the supernatant is removed;

[0021] The 3rd step adds 0.4g sodium hydroxide on the basis of the high silicon Y zeolite that crystallinity reduces after the alkali dissolution that makes, 10.0gTEABr (tetraethylammonium bromide), 10.0ml strong ammoniacal liquor, 28.0ml silica sol ( [SiO 2 ]=5.80mol / L), 16.0ml of distilled water were mixed and stirred into a uniform white jelly, put into a 150ml stainless steel reaction kettle, crystallized at 140°C for 6 days, taken out, wash...

Embodiment approach 3

[0023] In the first step, mix 13.0g high-silicon Y zeolite powder and 90.0ml NaOH (0.10mol / L) evenly, stir with magnetic force for 1 hour, put the mixed solution into a 150ml stainless steel reaction kettle, and dissolve it in alkali at 140°C for 20 Hours. Obtain a high-silicon Y zeolite whose crystallinity decreases after alkali dissolution;

[0024] In the second step, the obtained high-silicon Y zeolite whose crystallinity is reduced after alkali dissolution is centrifuged with a centrifuge, and the supernatant is removed;

[0025] The 3rd step adds 0.8g sodium hydroxide on the basis of the high silicon Y zeolite that crystallinity reduces after the alkali dissolution that makes, 10.0gTEABr (tetraethylammonium bromide), 10.0ml strong ammoniacal liquor, 28.0ml silica sol ( [SiO 2 ]=5.80mol / L), 16.0ml of distilled water were mixed and stirred into a uniform white jelly, put into a 150ml stainless steel reaction kettle, crystallized at 140°C for 8 days, taken out, washed unt...

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Abstract

The present invention belongs to the field of fine chemical technology, and is especially the preparation process of double pore high silicon zeolite molecular sieve as one kind of composite molecular sieve. The present invention features that by using type-Y high silicon zeolite as silicon and aluminum source, and through dissolving the surface of the high silicon type-Y crystal grain, mixing with ammonia water solution of ammonium tetraethyl bromide, adding certain amount of silica gel via stirring, crystallizing at 140-170 deg.C for 5-10 days, washing, stoving and roasting to eliminate template agent, double pore high silicon zeolite molecular sieve with both type-Y and type-beta molecular sieve pore canals is obtained. The double pore high silicon zeolite molecular sieve has low synthesis cost and high hydrothermal stability, and may be used in petrochemical industry.

Description

1. Technical field [0001] The preparation method of the high-silicon double-microporous composite molecular sieve of the present invention relates to a preparation method of an inorganic porous catalytic material, belongs to the field of fine chemical industry, and more specifically relates to a Beta / high-silicon Y double-microporous composite zeolite molecular sieve Preparation. 2. Technical Background [0002] Y-type zeolite is formed by faujasite cages interpenetrating with each other along three crystal axis directions through twelve-membered rings. It is an excellent catalyst with high cracking activity and good selectivity. Therefore, the invention of Y-type zeolite has epoch-making significance in the field of catalytic cracking. And Y-type zeolite with high silicon-aluminum ratio obtained by subjecting Y-type zeolite to hydrothermal treatment, that is, high-silicon Y-type zeolite. Due to the good hydrothermal stability and acid stability of high silicon aluminum ra...

Claims

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Application Information

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IPC IPC(8): C01B39/02C01B39/24
Inventor 李瑞丰秦波张喜文郭群孙万付马静红
Owner TAIYUAN UNIV OF TECH
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