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High-silica-alumina-ratio SSZ-39 zeolite, and synthesis and application thereof

A technology of SSZ-39 and synthesis method, which is applied in the direction of crystalline aluminosilicate zeolite, other chemical processes, carbon compound catalysts, etc., can solve the problems of reducing the use efficiency of nano-zeolite, easy agglomeration, etc., and achieve the suppression of hydrogen transfer and aluminum content The effect of low and high selectivity

Active Publication Date: 2017-05-31
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

However, small crystal or nano zeolites still face many problems in the process of synthesis and use, for example, they are easy to agglomerate during synthesis, and the composition and reaction conditions of the synthesis system need to be strictly controlled
Agglomeration often occurs during post-treatment processes such as drying and high-temperature roasting, which usually reduces the use efficiency of nano-zeolites.

Method used

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  • High-silica-alumina-ratio SSZ-39 zeolite, and synthesis and application thereof
  • High-silica-alumina-ratio SSZ-39 zeolite, and synthesis and application thereof
  • High-silica-alumina-ratio SSZ-39 zeolite, and synthesis and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Add 774.12g of water glass to 178.38g of 25wt% N,N-dimethyl-3,5-dimethylpiperidine (DMDMPOH, represented by "T") in an aqueous solution and stir well, then add 18.49g HY molecular sieve with a silicon-aluminum ratio of 5.2 and 0.4051g of NH4F powder, then sequentially add 2.32g of NaOH particles and 0.1746g of polyethylene glycol PEG-600 as a crystal growth inhibitor, add 294.80g 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 the raw materials were mixed evenly, and there was a mixed sol with the following molar composition: 0.29Na 2 O: SiO 2 : 0.0125A1 2 o 3 :0.08T:0.003F:15H 2 O.

[0039] The resulting solid mixture was transferred to Lined in a 2000ml hydrothermal crystallization kettle, stirred at 60rpm, crystallized at 120°C for 24 hours, then raised the temperature to 140°C for 48 hours. After the crystallization is complete, the product is cooled ra...

Embodiment 2

[0042] 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, fluoride ion, The molar ratio ratio of the amount of template agent and deionized water constitutes the following molar composition: 0.31Na 2 O: SiO 2 : 0.00625A1 2 o 3 :0.09T:0.008F:25H 2 O.

[0043] By the same ammonium ion exchange method as in Example 1, the H-type SSZ-39 molecular sieve product was obtained by drying and roasting. The addition amount of various raw materials for crystallization synthesis is shown in Table 1, and the molecular sieve sample is marked as B, and its physical and chemical properties are shown in Table 2.

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, fluoride ion, The molar ratio ratio of the amount of template agent and deionized water constitutes the following molar composition: 0.34Na 2 O: SiO 2 : 0.00417A1 2 o 3 :0.15T:0.02F:35H 2 O.

[0046] By the same ammonium ion exchange method as in Example 1, the H-type SSZ-39 molecular sieve product was obtained by drying and roasting. The addition amount of various raw materials for crystallization synthesis is shown in Table 1, and the molecular sieve sample is marked as C, and its physical and chemical properties are shown in Table 2.

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Abstract

The invention discloses a preparation method of a high-crystallinity high-dispersity adjustable-silica-alumina-ratio high-silicon SSZ-39 molecular sieve catalyst. The method comprises the following steps: proportionally adding a sodium source, a silicon source, an aluminum source, fluorine ions, a template, a growth polymerization inhibitor and deionized water into a synthesis kettle, carrying out dynamic or static crystallization in different temperature sections, and carrying out filtration, washing and drying on the product to obtain molecular sieve raw powder; and carrying out high-temperature roasting to remove the template, carrying out ion exchange, and carrying out high-temperature roasting to obtain the high-silica-alumina-ratio SSZ-39 molecular sieve. The high-silica-alumina-ratio SSZ-39 molecular sieve has appropriate acid site, heat stability and pore size. The high-crystallinity high-dispersity controllable-silica-alumina-ratio SSZ-39 molecular sieve can be used for MTO (methanol to olefins) reaction for catalytically converting organic oxides (such as methanol and / or dimethyl ether and the like) into low-carbon olefins, and has the advantages of very high reaction activity and high selectivity for ethylene and propylene.

Description

technical field [0001] The present invention relates to the synthesis of zeolite molecular sieves, especially a kind of SSZ-39 zeolite with AEI framework type, its synthesis and its application in the conversion of oxygen-containing compounds, especially methanol, ethanol, dimethyl ether, etc., into olefins, especially ethylene and propylene application. Background technique [0002] Methanol-to-Olefins (MTO for short) is a process in which coal or natural gas is used as raw material to produce ethylene, propylene and other low-carbon olefins through methanol. It is the most promising new process of non-petroleum route. Moreover, methanol is one of the most abundant chemical products that can be obtained from coal, natural gas and solid waste via synthesis gas (CO+H 2 )get. In the MTO reaction, the activity, selectivity and stability of the catalyst become the key technology. The molecular sieve catalysts currently used mainly include ZSM-5, SAPO-34, SAPO-44 and SAPO-47. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/04B01J20/18B01J20/30B01D53/02B01J29/70C07C1/20C07C11/04C07C11/06
CPCB01D53/02B01J20/18B01J29/70C01B39/04C01P2002/72C01P2004/03C07C1/20C07C2529/70C07C11/04C07C11/06Y02P20/52Y02P30/20Y02P30/40
Inventor 王志光魏永增李进王炳春刘宇婷李永宾
Owner 中海亚环保材料有限公司
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