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Synthetic method of c-axis orientated type Zn-ZSM-5 molecular sieve under action of external magnetic field

A technology of applying an external magnetic field and a synthetic method, which is applied in the directions of crystalline aluminosilicate zeolite, borane silicone crystalline aluminosilicate zeolite, etc., can solve the problem of large amount of template agent, c-axis ZSM-5 crystal phase growth and anti-accumulation Carbon, methanol conversion rate and other issues, to achieve the effects of good repeatability, excellent methanol conversion rate and aromatics yield, and simple synthesis process

Active Publication Date: 2017-08-25
CHINA UNIV OF MINING & TECH
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Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of synthetic method of the c-axis orientation type Zn-ZSM-5 molecular sieve under the action of an external magnetic field, to solve the excessive dosage of template agent existing in the hydrothermal synthesis method of synthesizing nanometer ZSM-5 molecular sieve , and the crystal phase growth and anti-coking of c-axis ZSM-5, and the problem of methanol conversion rate

Method used

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  • Synthetic method of c-axis orientated type Zn-ZSM-5 molecular sieve under action of external magnetic field
  • Synthetic method of c-axis orientated type Zn-ZSM-5 molecular sieve under action of external magnetic field
  • Synthetic method of c-axis orientated type Zn-ZSM-5 molecular sieve under action of external magnetic field

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Effect test

Embodiment 1

[0038] (1) 15ml of absolute ethanol, 30ml of deionized water and 25ml of ethyl orthosilicate were mixed and stirred evenly at room temperature.

[0039] (2) Slowly add 4.4ml of tetrapropylammonium hydroxide dropwise to the solution obtained in step (1), and stir at room temperature for 4h.

[0040] (3) Transfer the solution obtained in step (2) into a reactor containing a polytetrafluoroethylene liner, age at 80° C. for 24 hours, and then crystallize at 120° C. for 4 hours to obtain a seed crystal suspension.

[0041] (4) Add 6ml of 1mol / L Al(NO 3 ) 3 solution, 6ml of 1mol / L Zn(NO 3 ) 2 solution, 36ml of 2mol / L NaOH solution and 78ml of deionized water were mixed and stirred evenly.

[0042] (5) in the solution that step (4) obtains, stir and drop 72g silica sol (50% SiO 2 ).

[0043] (6) Slowly add 10% seed crystal suspension to the solution obtained in step (5).

[0044] (7) Add 3ml of 1,6-hexanediamine to the solution obtained in step (6), and stir well.

[0045] (8...

Embodiment 2

[0049] Example 2: The difference between this embodiment and the specific example 1 is that in step (3), the crystallization was carried out at 100° C. for 6 hours. Other steps and parameter are identical with specific embodiment 1.

Embodiment 3

[0050] Embodiment 3: The difference between this embodiment and specific embodiment 1 is that in step (6), 5% seed crystal suspension is slowly added dropwise. Other steps and parameter are identical with specific embodiment 1.

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Abstract

The invention provides a synthetic method of a c-axis orientated type Zn-ZSM-5 molecular sieve under the action of an external magnetic field, and belongs to synthetic methods of Zn-ZSM-5 molecular sieves. Through the specific action of the external magnetic field, the problem of orientated preferential growth of the morphology and structure in the crystal growth process of ZSM-5 is solved. The synthetic method comprises the following steps: adding prefabricated silicalite-1 seed crystals into a Zn<2+> doped mixed gel, conducting aging under the action of an external magnetic field with a specific strength, and then conducting crystallization, drying and roasting to obtain the c-axis orientated type Zn-ZSM-5. The technique has the characteristics that the external magnetic field with the specific strength has an obvious guiding action on the grain growth of the molecular sieve, the synthesized molecular sieve monomer when placed in the position of a horizontal magnetic induction line has a c-axis orientated structure, simultaneously a zinc type ZSM-5 molecular sieve new material with c-axis direction preferential growth can be successfully synthesized by doping once, the synthetic process is simple and has good repeatability, the specific area of the new material is larger, and the technique shows excellent methanol conversion, aromatic hydrocarbon yield, anti-carbon property and stability when applied to methanol aromatization reaction.

Description

technical field [0001] The invention relates to a synthesis method of Zn-ZSM-5 molecular sieve, in particular to a synthesis method of c-axis orientation type Zn-ZSM-5 molecular sieve under the action of an external magnetic field. Background technique [0002] ZSM-5 belongs to the MFI type molecular sieve. The channel structure consists of a straight cylindrical a-axis channel with an oval cross section (the channel size is 0.54nm×0.56nm) and a Z-shaped b-axis channel with an approximately circular cross section (the channel size is 0.52nm). ×0.58nm) intersections; the difference in the nanoscale pore structure of ZSM-5 molecular sieve with different axial orientations leads to huge differences in the mass transfer characteristics, adsorption characteristics and reaction characteristics of chemical molecules in the molecular sieve pores. Since the molecular sizes of benzene (B), toluene (T) and xylene (X) are similar to the pore diameter of ZSM-5 zeolite, the ZSM-5 zeolite ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/40
CPCC01B39/40C01P2002/72C01P2004/03C01P2004/04
Inventor 褚睿智孟献梁宋成成苗真勇吴国光侯文心
Owner CHINA UNIV OF MINING & TECH
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