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Macroporous-microporous composite Silicalite-1 molecular sieve flake and synthetic method thereof

A molecular sieve and microporous technology, which is used in the field of molecular sieve synthesis to reduce production costs and inhibit growth.

Inactive Publication Date: 2019-02-26
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is still a great challenge to develop a new type of molecular sieve material that can combine the advantages of both.

Method used

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  • Macroporous-microporous composite Silicalite-1 molecular sieve flake and synthetic method thereof
  • Macroporous-microporous composite Silicalite-1 molecular sieve flake and synthetic method thereof
  • Macroporous-microporous composite Silicalite-1 molecular sieve flake and synthetic method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1: Mesoporous silica

[0039] The morphology and performance parameters of the mesoporous silica used are shown in Table 1, and the scanning electron microscope images are shown in figure 1 .

[0040] Table 1 Morphology and performance parameters of mesoporous silica

[0041]

Embodiment 2

[0042] Example 2: Preparation of sample HMS-Silicalite-1-1-7

[0043] First, add urea and tetrapropylammonium hydroxide into deionized water, stir and dissolve to obtain mixed solution A. An equal volume of the above solution A was impregnated with mesoporous silica, and solid B was obtained after drying at room temperature for a period of time. The above solid mixture B was transferred to the upper plate of the stainless steel autoclave, and water was added to the bottom of the autoclave. Seal the stainless steel reaction kettle, put it in an oven, and crystallize at 100-180°C for 12-50 hours. Cool rapidly after the reaction, separate the solid product, wash with deionized water, dry at 110°C in an air atmosphere and bake at 550°C for 6 hours to obtain a sheet-like macroporous-microporous composite Silicalite-1 molecular sieve. The corresponding relationship between the sample number and the preparation conditions is shown in Table 2.

[0044] The prepared samples were cha...

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Abstract

The invention discloses a nano-flake Silicalite-1 molecular sieve with a macroporous-microporous composite porous structure and a synthesis method of the nano-flake Silicalite-1 molecular sieve. The molecular sieve is of an MFI topological structure and is a nano-flake molecular sieve with a relatively short b axis in morphology; a crystal is internally embedded with abundant macropores, and the thickness of the nanoflake and the pore size of the macropores both can be regulated in a relatively wide range. The synthesis method of the nano-flake Silicalite-1 molecular sieve is characterized inthat the Silicalite-1 molecular sieve with the macroporous-microporous composite porous structure is prepared by taking urea, organic amine or inorganic alkali and ammonium salt impregnated mesoporoussilica as a precursor and utilizing a steam assisted crystallization method. According to the synthesis method, the macropores are constructed without the need of additionally adding a secondary template agent; the precursor is the raw material for synthesizing the molecular sieve and is also a temporary macroporous template agent; meanwhile, the cheap and easily-obtained urea is used as a crystal growth inhibitor; the method is simple and feasible and the synthesis cost is low.

Description

technical field [0001] The invention belongs to the technical field of molecular sieve synthesis, and in particular relates to a novel nanosheet macropore-micropore composite Silicalite-1 molecular sieve with abundant macropores inlaid inside and a synthesis method thereof. Background technique [0002] Among many kinds of porous materials with different properties, zeolite molecular sieves are used as catalysts, catalyst carriers and adsorption separation materials in petrochemical, fine It is widely used in chemical industry and coal chemical industry (Chem. Rev., 1997, 97, 2373-2419; Chem. Eng., 2011, 118, 16-20). The single microporous structure of molecular sieves makes it encounter many problems in catalyzing macromolecular reactions. First, larger reactant molecules cannot access the active sites within the bulk phase of the zeolite crystal, which greatly reduces the efficiency of the zeolite catalyst. Secondly, smaller molecular diffusion channels will also inhibit...

Claims

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Application Information

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IPC IPC(8): C01B37/02B82Y40/00
CPCB82Y40/00C01B37/02C01P2002/72C01P2004/03C01P2004/24C01P2004/62C01P2004/64C01P2006/14C01P2006/16
Inventor 许磊张艳飞张晓敏李沛东陈磊
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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