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Eutectic nano molecular sieve, preparation method and applications 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: 2020-05-08
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 applications thereof
  • Eutectic nano molecular sieve, preparation method and applications thereof
  • Eutectic nano molecular sieve, preparation method and applications 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 dissolved and clear; add 11.6g of phosphoric acid (85%) and deionized water to In the above clear solution, continue stirring for 1 h; after the stirring is completed, the mixed solution is placed in a reaction kettle and crystallized at 170° C. for 3 days.

[0036] (2) Synthesis of SAPO-18 / SAPO-34 eutectic molecular sieves:

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

Embodiment 2

[0039] (1) seed crystal is prepared by [embodiment 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 dissolved and clear; add 11.6g of phosphoric acid (85%) and deionized water to In the above clear solution, continue stirring for 1 h; after the stirring is completed, the mixed solution is placed in a reaction kettle and crystallized at 170° C. for 3 days.

[0041] (2) Synthesis of SAPO-18 / SAPO-34 eutectic molecular sieves:

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

Embodiment 3

[0044] (1) seed crystal is prepared by [embodiment 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 dissolved and clear; add 11.6g of phosphoric acid (85%) and deionized water to In the above clear solution, continue stirring for 1 h; after the stirring is completed, the mixed solution is placed in a reaction kettle and crystallized at 170° C. for 3 days.

[0046] (2) Synthesis of SAPO-18 / SAPO-34 eutectic molecular sieves:

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

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Abstract

The invention belongs to the field of molecular sieves, particularly relates to a low-silicon AEI / CHA eutectic nano molecular sieve, a preparation method and applications thereof. A purpose of the invention is mainly to solve the problems of low AEI content, complex preparation process, high template agent price, high template agent dosage, high production cost and the like in the AEI / CHA eutecticmolecular sieve prepared by the conventional synthesis method. The preparation method of the molecular sieve specifically comprises the following steps: adding an aluminum source, a phosphorus source, a template agent and the like into distilled water, uniformly stirring and dispersing, and then adding a seed crystal to obtain a mixed solution; and crystallizing, separating, washing, drying and roasting the obtained mixed solution to obtain the eutectic nano molecular sieve formed by AEI and CHA symbiosis. The molecular sieve obtained in the invention has the advantages of high proportion ofAEI structural units and uniform dispersion of silicon species, and further has high CO conversion rate and low carbon olefin selectivity in a reaction for preparing low carbon olefins through directconversion of catalytic synthesis gas.

Description

technical field [0001] The invention belongs to the field of molecular sieves, and in particular relates to a eutectic nano-molecular sieve, in particular to a low-silicon AEI / CHA eutectic molecular sieve, a preparation method and an application thereof. Background technique [0002] Molecular sieves are a class of crystalline aluminosilicate materials with multidimensional 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-alumino molecular sieves, silica-aluminophosphate (SAPO) molecular sieves have attracted more and more attention due to their excellent catalytic and adsorption properties. Silicoaluminophosphate molecular sieve was first developed by United Carbide Corporation (UCC) in 1982. In addition to SiO 4 , AlO 4 Outside the tetrahedron, there is also PO 4 tetrahedral unit. Studies have shown that catalysts constructed wit...

Claims

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Application Information

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Patent Type & Authority Applications(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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