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Eutectic nano-molecular sieve, preparation method and application thereof

A nano-molecular sieve and molecular sieve technology, applied in the field of molecular sieves, can solve the problems of low AEI content of synthetic molecular sieve, large amount of expensive template agent, complicated preparation process, etc., and achieve the effects of moderate acid strength, reduced preparation cost and high content

Active Publication Date: 2022-07-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to solve the problems of high cost due to the use of expensive templates in the existing synthesis methods, large amount of expensive templates used, complicated preparation procedures, and low AEI content in synthetic molecular sieves, and provides a new AEI / CHA co- A crystal molecular sieve and a preparation method thereof. When the method is used in the preparation of AEI / CHA co-crystal molecular sieves, it has the advantages of simple preparation process, wide variety of templates, and high AEI content of the prepared co-crystal molecular sieve.

Method used

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  • Eutectic nano-molecular sieve, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Preparation of seed crystals:

[0035] Add 10.2g of aluminum isopropoxide solid powder to 59.9g of tetraethylammonium hydroxide (TEAOH, 25wt%) solution, stir at 25°C for 1h until the solution is clear; add 11.6g of phosphoric acid (85%) and deionized water to In the above clear solution, stirring was continued for 1 h; after stirring, the mixed solution was placed in a reaction kettle and crystallized at 170° C. for 3 days.

[0036] (2) Synthesis of SAPO-18 / SAPO-34 co-crystal molecular sieve:

[0037] 23.1g phosphoric acid (85%), 12.0g pseudoboehmite aluminum (Al 2 O 3 , 75.8%) was added to a certain amount of deionized water, stirred until it was evenly mixed; 1.50g of silica sol (40%) and 20.2g of triethylamine, seed (Al 2 O 3 5.0%), etc. were added to the above mixed sol, and continued stirring for 1 h until the components were dispersed uniformly; the mixed gel was placed in the reaction kettle and hydrothermally crystallized at 150 ° C for 3 days; After w...

Embodiment 2

[0039] (1) The seed crystal is prepared according to [Example 1]:

[0040] Add 10.2g of aluminum isopropoxide solid powder to 59.9g of tetraethylammonium hydroxide (TEAOH, 25wt%) solution, stir at 25°C for 1h until the solution is clear; add 11.6g of phosphoric acid (85%) and deionized water to In the above clear solution, stirring was continued for 1 h; after stirring, the mixed solution was placed in a reaction kettle and crystallized at 170° C. for 3 days.

[0041] (2) Synthesis of SAPO-18 / SAPO-34 co-crystal molecular sieve:

[0042] 23.1g phosphoric acid (85%), 12.0g pseudoboehmite aluminum (Al 2 O 3 , 75.8%) was added to a certain amount of deionized water, stirred until it was evenly mixed; 0.75g of silica sol (40%) and 20.2g of triethylamine, seed (Al 2 O 3 5.0%), etc. were added to the above mixed sol, and continued stirring for 1 h until the components were dispersed uniformly; the mixed gel was placed in the reaction kettle and hydrothermally crystallized at 150...

Embodiment 3

[0044] (1) The seed crystal is prepared according to [Example 1]:

[0045] Add 10.2g of aluminum isopropoxide solid powder to 59.9g of tetraethylammonium hydroxide (TEAOH, 25wt%) solution, stir at 25°C for 1h until the solution is clear; add 11.6g of phosphoric acid (85%) and deionized water to In the above clear solution, stirring was continued for 1 h; after stirring, the mixed solution was placed in a reaction kettle and crystallized at 170° C. for 3 days.

[0046] (2) Synthesis of SAPO-18 / SAPO-34 co-crystal molecular sieve:

[0047] 23.1g phosphoric acid (85%), 12.0g pseudoboehmite aluminum (Al 2 O 3 , 75.8%) was added to a certain amount of deionized water, stirred until mixed uniformly; 0.30g of silica sol (40%) and 20.2g of triethylamine, seed 2 O 3 5.0%), etc. were added to the above mixed sol, and continued stirring for 1 h until the components were dispersed uniformly; the mixed gel was placed in the reaction kettle and hydrothermally crystallized at 150 ° C for...

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Abstract

The invention belongs to the field of molecular sieves, and in particular relates to a low-silicon AEI / CHA eutectic nano-molecular sieve, a preparation method and application thereof, and mainly solves the problems of low AEI content and complicated preparation procedures in the AEI / CHA eutectic molecular sieve prepared in the existing synthesis method. , the templating agent is expensive and the amount of the templating agent is large, which leads to the problem of high production cost. The specific process of the molecular sieve preparation method of the present invention includes: adding aluminum source, phosphorus source and template agent into distilled water, stirring and dispersing evenly, and then adding crystal seeds to obtain a mixed solution. After the obtained mixed solution is crystallized, separated, washed, dried and calcined, a eutectic nano-molecular sieve formed by the symbiosis of AEI and CHA is obtained. The molecular sieve obtained by the invention has a high proportion of AEI structural units, uniform dispersion of silicon species, higher CO conversion rate and lower olefin selectivity in the reaction of catalyzing the direct conversion of synthesis gas to lower olefins.

Description

technical field [0001] The invention belongs to the field of molecular sieves, in particular to a eutectic nano molecular sieve, in particular to a low-silicon AEI / CHA eutectic molecular sieve, a preparation method and applications thereof. Background technique [0002] Molecular sieves are a class of crystalline aluminosilicate materials with multi-dimensional pores. They are widely used in industrial processes due to their large specific surface area, excellent adsorption, ion exchange and catalytic properties. In addition to conventional silica-alumina molecular sieves, silico-aluminophosphate series (SAPO) molecular sieves have received more and more attention due to their excellent catalytic and adsorption properties. Silicon aluminum phosphate molecular sieve was first developed by United Carbide Corporation (UCC) in 1982, and its framework structure contains SiO in addition to 4 , AlO 4 Outside the tetrahedron, there is also PO 4 Tetrahedral unit. Studies have sho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/54B01J29/80C07C11/04C07C11/06C07C1/04C07C1/20B82Y40/00B82Y30/00
CPCC01B39/54B01J29/80B01J23/002C07C1/043C07C1/20B82Y40/00B82Y30/00B01J29/85C07C2529/80C01P2002/72C07C11/04C07C11/06Y02P30/40
Inventor 焦文千王仰东刘苏周海波苏俊杰张琳刘畅
Owner CHINA PETROLEUM & CHEM CORP
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