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Laminar heteroatom molecular sieve and synthesizing method thereof

A technology of heteroatom molecular sieve and synthesis method, applied in molecular sieve compounds, molecular sieve characteristic silicates, chemical instruments and methods, etc., can solve the problems of large diffusion resistance, difficult solid-liquid separation, and few active centers of microporous molecular sieves, and achieves The effect of inhibiting carbon deposition inactivation, improving diffusion performance, and reducing preparation cost

Inactive Publication Date: 2019-04-12
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problems of existing microporous molecular sieves such as high diffusion resistance, easy carbon deposition and deactivation, difficult solid-liquid separation, and few active centers.

Method used

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  • Laminar heteroatom molecular sieve and synthesizing method thereof
  • Laminar heteroatom molecular sieve and synthesizing method thereof
  • Laminar heteroatom molecular sieve and synthesizing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Add 12.1g of methyl orthosilicate, 20g of 25wt% tetrapropylammonium hydroxide aqueous solution, 15g of deionized water, and 1.8g of gelatin into a jacketed three-necked flask, and stir evenly to obtain a mixed solution A; mix the mixed solution A in Hydrolysis at 50°C for 1.5h. Mix 0.47g tetraethyl titanate, 8.1g 25wt% tetrapropylammonium hydroxide aqueous solution, and 15g deionized water, and stir evenly to obtain mixed solution B; hydrolyze mixed solution B at 50°C for 1.5h; mix mixed solution A Mix with mixed solution B, stir evenly, remove alcohol at 90°C for 2 hours, add 0.3g gelatin to obtain mixed solution C, stir mixed solution C at 40°C for 20min, put the mixed solution into a crystallization kettle, and crystallize at 160°C After 72 hours, the crystallized product was washed, dried, and then calcined at 480°C for 5 hours to obtain TS-1, which was numbered TS-1-C.

Embodiment 2

[0048] Add 16.5g of tetrapropylammonium hydroxide aqueous solution, 20g of 25wt% tetrapropylammonium hydroxide solution, 15g of deionized water, 1.8g of gelatin in the jacketed three-necked flask, stir evenly, and obtain the mixed solution A; Hydrolysis at 40°C for 1h. Mix 0.47g of tetraethyl titanate, 8.1g of 25wt% tetrapropylammonium hydroxide aqueous solution, and 15g of deionized water, and stir evenly to obtain a mixed solution B; hydrolyze the mixed solution B at 40°C for 0.5h; Mix A and mixed solution B, stir evenly, remove alcohol at 90°C for 1 hour, add 0.3g gelatin to obtain mixed solution C, stir mixed solution C at 50°C for 15min, put the mixed solution into a crystallization tank, and heat at 160°C After crystallization for 72 hours, the crystallized product was washed, dried, and calcined at 480°C for 5 hours to obtain TS-1, which was designated as TS-1-D.

Embodiment 3

[0050] Add 16.5g tetrapropylammonium hydroxide aqueous solution, 20g 25wt% tetrapropylammonium hydroxide aqueous solution, 15g deionized water, 1.8g gelatin in the three-necked flask with jacket, stir well, obtain mixed solution A; Mixed solution A Hydrolysis at 40 ° C for 2h. Mix 1.45g of tetrabutyl titanate, 8.1g of 25wt% tetrapropylammonium hydroxide aqueous solution, and 15g of deionized water, and stir evenly to obtain a mixed solution B; hydrolyze the mixed solution B at 50°C for 1 hour; mix the mixed solution A and Mix the mixed solution B, stir evenly, remove the alcohol at 80°C for 1 hour, add 0.3g of gelatin to obtain the mixed solution C, stir the mixed solution C at 40°C for 20min, put the mixed solution into a crystallization kettle, and crystallize at 160°C After 72 hours, the crystallized product was washed, dried, and then calcined at 540°C for 6 hours to obtain TS-1, which was numbered TS-1-E.

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Abstract

The invention relates to the technical field of synthesis of catalysts, and provides laminar heteroatom molecular sieve and a synthesizing method thereof. The laminar heteroatom molecular sieve prepared by using the method has an MFI type topological structure, the maximum surface of nanosheets is parallel to the (0,2,0) crystal face, and the length of a straight channel can be controlled. Due toshort straight channels of the nanosheets, the diffusion path of a reaction is shortened, reactant molecules more easily make contact with the active center, the generated product is diffused out of the channels in time, the diffusion limitations of the molecules in the channels are reduced, carbon deposition is reduced, and the service life of a catalyst is prolonged. The laminar heteroatom molecular sieve prepared by using the method belongs to monodisperse nanosheets, the particle size is large, the particle size is in micron level, and the product is easily separated from mother liquor. Astructure modifier added in the synthesizing method is protein or polypeptide or gelatin or gelatin hydrolysates, the structure modifier is low in cost and easy to obtain and does not need to be additionally synthesized.

Description

technical field [0001] The invention relates to the technical field of catalyst synthesis, in particular to a method for synthesizing flaky heteroatom molecular sieves. Background technique [0002] Zeolites are microporous aluminosilicate crystals that are widely used in the fields of adsorption, separation and catalysis. Zeolite was first discovered as a mineral in nature and has a history of more than 260 years. Since the discovery of zeolite minerals in the 1850s, a large number of scientific researchers have carried out continuous and in-depth research on the structure, performance, synthesis and application of zeolite materials. [0003] In 1756, Swedish mineralogists discovered stilbene for the first time in basalt. In 1932, McBain first proposed the concept of molecular sieves to define porous solid materials that act as sieves at the molecular scale. Mobil Corporation used the synthetic X zeolite for catalytic cracking in 1962, and prepared the first zeolite and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B37/00B82Y40/00
CPCB82Y40/00C01B37/005C01P2004/24C01P2004/62C01P2004/64
Inventor 吉英左轶郭新闻刘民
Owner DALIAN UNIV OF TECH
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