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A kind of ssz-39/zsm-5 composite molecular sieve and its synthesis method and application

A technology of SSZ-39 and ZSM-5, which is applied in the field of preparation of SSZ-39/ZSM-5 composite molecular sieve catalysts, can solve the problems of low reaction activity, weak acidity, and single pore size of porous materials, and achieve high catalytic activity and high yield The effect of improving and enhancing the reactivity

Active Publication Date: 2019-03-08
中海亚环保材料有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] One of the technical problems to be solved by the present invention is that the porous material synthesized in the prior art has a single pore size, weak acidity and low reactivity. A new composite molecular sieve is provided. The molecular sieve has multi-stage channels, wide acid distribution, Advantages of higher reactivity

Method used

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  • A kind of ssz-39/zsm-5 composite molecular sieve and its synthesis method and application
  • A kind of ssz-39/zsm-5 composite molecular sieve and its synthesis method and application
  • A kind of ssz-39/zsm-5 composite molecular sieve and its synthesis method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Add 751.05g of water glass to 178.38g of 25wt% N,N-dimethyl-3,5-dimethylpiperidine (DMDMPOH, denoted by "T") aqueous solution and stir well, then add 26.42g The HY molecular sieve with a silicon-to-aluminum ratio of 5.2 was added in sequence with 4.71 g of NaOH particles, and 310.19 g of deionized water was added and stirred thoroughly. The resulting mixed slurry was continuously stirred in a sealed container at room temperature for 2 hours until all the raw materials were uniformly mixed. As a precursor sol synthesized by SSZ-39 molecular sieve, the mixed sol has the following molar composition:

[0037] 0.29Na 2 O: SiO 2 : 0.01786A1 2 O 3 : 0.08T: 15H 2 O

[0038] 232.43g of HZSM-5 molecular sieve (silica to aluminum ratio of 241) was treated with 1.0mol / L NaOH solution at 90℃ for 2 hours at the ratio of 1g solid: 10ml solution, washed and dried at 120℃ for 12 hours, then added to The SSZ-39 precursor mixed sol was re-stirred and mixed uniformly, and then transferred to a...

Embodiment 2

[0041] The same experimental method and experimental raw materials as in Example 1 were used to synthesize SSZ-39 molecular sieve. The difference was the difference in the amount of raw materials added, so that the silicon source, sodium source, aluminum source, template agent and template were contained in the sol before the crystallization reaction. The molar ratio of the added amount of deionized water constitutes the following molar composition:

[0042] 0.31Na 2 O: SiO 2 : 0.01176A1 2 O 3 : 0.09T: 25H 2 O

[0043] 291.50g of HZSM-5 molecular sieve (silica-to-aluminum ratio is 186) is treated with 1.0mol / L NaOH solution at 90℃ for 2 hours at the ratio of 1g solid: 10ml solution, washed and dried at 120℃ for 12 hours, then added to The SSZ-39 precursor solution was stirred and mixed uniformly again, and then moved to a 2L hydrothermal crystallization kettle for crystallization reaction. The H-type SSZ-39 / ZSM-5 molecular sieve product was obtained by the same ammonium ion exchan...

Embodiment 3

[0045] The same experimental method and experimental raw materials as in Example 1 were used to synthesize SSZ-39 molecular sieve. The difference was the difference in the amount of raw materials added, so that the silicon source, sodium source, aluminum source, template agent and template were contained in the sol before the crystallization reaction. The molar ratio of the added amount of deionized water constitutes the following molar composition:

[0046] 0.34Na 2 O: SiO 2 : 0.00625A1 2 O 3 : 0.15T: 35H 2 O

[0047] 391.48g of HZSM-5 molecular sieve (with a silicon-to-aluminum ratio of 124) was treated with 1.0mol / L NaOH solution at 90°C for 2 hours at the ratio of 1g solid: 10ml solution, washed, dried at 120°C for 12 hours, and added to The SSZ-39 precursor solution was stirred and mixed uniformly again, and then moved to a 5L hydrothermal crystallization kettle for crystallization reaction. The H-type SSZ-39 / ZSM-5 molecular sieve product was obtained by the same ammonium ion...

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Abstract

The invention discloses an SSZ-39 / ZSM-5 composite molecular sieve and a synthesis method and application thereof. The synthesis method comprises the steps of providing an aluminum source through FAU-type aluminosilicate zeolite, taking an alkyl-substituted piperidine onium compound as a template agent, adding alkali-treated HZSM-5 to participate in crystallization synthesis, carrying out crystallization to obtain SSZ-39 / ZSM-5 composite molecular sieve powder and detecting a diffraction peak through characterized XRD, wherein the molar ratio of SiO2 to Al2O3 is 20-250. The composite molecular sieve is subjected to cation exchange to obtain different ion exchange-type molecular sieves as the catalyst. The composite molecular sieve of the invention has the advantages of hierarchical holes, relatively wide acid distribution and relatively high reaction activity, and is especially suitable for solving the problems that a methanol-to-olefin catalyst is low in stability, the total low-carbon olefin selectivity is low and the yield is low.

Description

Technical field [0001] The present invention relates to a preparation method of SSZ-39 / ZSM-5 composite molecular sieve catalyst, which is used in the conversion of oxygen-containing compounds such as methanol to olefins, especially to low-carbon olefins (including ethylene, propylene and butene). Background technique [0002] As basic chemical raw materials, light olefins are used in large quantities in the chemical industry and play a pivotal role in the modern petrochemical industry. The demand for them has increased rapidly in recent years and has been in short supply. The traditional preparation process of low-carbon olefins is the petroleum cracking method, but due to the non-renewability of petroleum resources, the increasing shortage of reserves, the violent price fluctuations, and the high energy consumption, high pollution, and low selectivity of low-carbon olefins in the petroleum cracking route The problem is that scientific research institutions around the world have ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/80C07C11/04C07C11/06C07C11/08C07C1/20
CPCB01J29/40B01J29/70B01J29/80C07C1/20C07C2529/80C07C11/04C07C11/06C07C11/08Y02P20/52Y02P30/20Y02P30/40
Inventor 王志光刘宇婷李进王炳春王丹丹
Owner 中海亚环保材料有限公司
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