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SSZ-39/ZSM-5 composite molecular sieve and synthesis method and application thereof

A composite molecular sieve, SSZ-39 technology, applied in molecular sieve catalysts, including molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of low reaction activity, weak acidity, single pore size of porous materials, etc., and achieve high catalytic activity and yield. The effect of improving and enhancing the reactivity

Active Publication Date: 2017-05-10
中海亚环保材料有限公司
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  • Summary
  • 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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  • SSZ-39/ZSM-5 composite molecular sieve and synthesis method and application thereof
  • SSZ-39/ZSM-5 composite molecular sieve and synthesis method and application thereof
  • SSZ-39/ZSM-5 composite molecular sieve and synthesis method and application thereof

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, represented by "T") in aqueous solution and stir well, then add 26.42g HY molecular sieve with a silicon-aluminum ratio of 5.2, then add 4.71g of NaOH particles in sequence, and add 310.19g of deionized water and stir thoroughly. The resulting mixed slurry was continuously stirred in a sealed container at room temperature for 2 hours until all raw materials were mixed evenly. As the precursor sol synthesized by SSZ-39 molecular sieve, the mixed sol had 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 (silicon-alumina ratio is 241) was treated with 1.0mol / L NaOH solution at 90°C for 2 hours according to the ratio of 1g solid: 10ml solution, washed and dried at 120°C for 12 hours, then added to The above SSZ-39 precursor mixed sol was stirred and mixed evenly, then moved to a 2L hydrotherm...

Embodiment 2

[0041] Using the same experimental method and experimental raw materials as in Example 1 to synthesize SSZ-39 molecular sieves, the difference is the difference in the amount of raw materials added, so that in the sol before the crystallization reaction, silicon source, sodium source, aluminum source, template agent and The molar ratio 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 (silicon-alumina ratio of 186) was treated with 1.0mol / L NaOH solution at 90°C for 2 hours according to the ratio of 1g solid: 10ml solution, washed and dried at 120°C for 12 hours, then added to The above SSZ-39 precursor solution was re-stirred and mixed evenly, and then moved to a 2L hydrothermal crystallization kettle for crystallization reaction. By the same ammonium ion exchange method as in Example 1, the H-type SSZ-39 / ZSM-5 molecular sieve pr...

Embodiment 3

[0045] Using the same experimental method and experimental raw materials as in Example 1 to synthesize SSZ-39 molecular sieves, the difference is the difference in the amount of raw materials added, so that in the sol before the crystallization reaction, silicon source, sodium source, aluminum source, template agent and The molar ratio 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 (silicon-alumina ratio of 124) was treated with 1.0mol / L NaOH solution at 90°C for 2 hours according to the ratio of 1g solid: 10ml solution, washed and dried at 120°C for 12 hours, then added to The above SSZ-39 precursor solution was stirred and mixed evenly, and then moved to a 5L hydrothermal crystallization kettle for crystallization reaction. By the same ammonium ion exchange method as in Example 1, the H-type SSZ-39 / ZSM-5 molecular sieve produ...

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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 invention relates to a preparation method of SSZ-39 / ZSM-5 composite molecular sieve catalyst, and its application in converting oxygen-containing compounds such as methanol into olefins, especially into low-carbon olefins (including ethylene, propylene and butene). Background technique [0002] Light olefins are widely used in the chemical industry as basic chemical raw materials, and play a pivotal role in the modern petrochemical industry. The demand for them has increased rapidly in recent years, and the supply has been in short supply. The traditional preparation process of low-carbon olefins is petroleum cracking, but due to the non-renewability of petroleum resources, the increasing shortage of reserves, the sharp fluctuations in prices, and the high energy consumption, high pollution, and low selectivity of low-carbon olefins in the petroleum cracking route In order to solve the problem, various scientific research institutions in the world ...

Claims

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Application Information

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Patent Type & Authority Applications(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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