ATS type silicon-aluminum molecular sieve as well as preparation method and application thereof

A silicon-aluminum molecular sieve and molecular sieve technology, applied in molecular sieves and alkali exchange compounds, molecular sieve catalysts, chemical instruments and methods, etc., can solve the problems of high silicon-aluminum ratio and achieve high acid strength and high acid content

Active Publication Date: 2022-01-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The products prepared in the prior art are basically ATS-type molecular sieves composed of pure silicon, phosphorus-aluminum or metal phosphorus-aluminum, etc. There are few related reports on ATS-type molecular sieves composed of silicon-aluminum, and the silicon-aluminum ratio is also high

Method used

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  • ATS type silicon-aluminum molecular sieve as well as preparation method and application thereof
  • ATS type silicon-aluminum molecular sieve as well as preparation method and application thereof
  • ATS type silicon-aluminum molecular sieve as well as preparation method and application thereof

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preparation example Construction

[0043] The invention relates to an ATS type silicon aluminum molecular sieve, its preparation method and application.

[0044] According to the present invention, the ATS-type silica-alumina molecular sieve can exist in an uncalcined state (synthesized state) or in a calcined state. When present in a synthesized state, the ATS-type silica-alumina molecular sieve generally has a schematic chemical composition represented by the formula "oxide·organic structure directing agent·water". In the case of existing in a calcined state, it is known that molecular sieves sometimes contain a certain amount of moisture (especially immediately after synthesis), but the present invention does not consider it necessary to specify the amount of moisture because the moisture The presence or absence of will not substantially affect the XRD spectrum of the molecular sieve.

[0045] According to the present invention, in the schematic chemical composition represented by the formula "oxide·organic...

Embodiment 1

[0077] With 5.801 grams of deionized water, 7.161 grams of organic structure directing agent 4-pyrrolidinylpyridine, 14.515 grams of silica sol (containing SiO 2 40% by weight), 3.9474 grams of aluminum isopropoxide, and 4.834 grams of hydrofluoric acid (containing 40% by weight of HF) were mixed uniformly, and after stirring at room temperature for 2 hours, the raw material solution was stirred at 80° C., and 9.05 grams of water were evaporated to obtain Mixture, final material ratio (mol ratio) is:

[0078] al 2 o 3 / SiO 2 =0.10

[0079] 4-Pyrrolidinylpyridine / SiO 2 =0.5

[0080] F / SiO 2 =1.0

[0081] h 2 O / SiO 2 =4.8

[0082] The mixture was charged into a stainless steel reactor and crystallized at 170°C for 14 days. After crystallization, filter, wash, and dry in an oven at 110°C to obtain the XRD spectrum of the molecular sieve as shown in figure 1 As shown, it is an ATS silicon-aluminum molecular sieve; the SEM image of the molecular sieve is as follows f...

Embodiment 2

[0086] With 13.339 grams of deionized water, 11.974 grams of organic structure directing agent 4-pyrrolidinylpyridine, 20.226 grams of silica sol (containing SiO 2 40% by weight), 5.5007 grams of aluminum isopropoxide, and 6.063 grams of hydrofluoric acid (containing 40% by weight of HF) were uniformly mixed, and after stirring at room temperature for 2 hours, the raw material solution was stirred at 65° C., and 18.44 grams of water were evaporated to obtain Mixture, final material ratio (mol ratio) is:

[0087] al 2 o 3 / SiO 2 =0.10

[0088] 4-Pyrrolidinylpyridine / SiO 2 =0.6

[0089] F / SiO 2 =0.9

[0090] h 2 O / SiO 2 =4.4

[0091] The mixture was charged into a stainless steel reactor and crystallized at 160°C for 12 days. After crystallization, filter, wash, and dry in an oven at 110°C to obtain the XRD spectrum of the molecular sieve as shown in Figure 4 As shown, it is an ATS type silica-alumina molecular sieve; the SEM image of the molecular sieve is as foll...

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Abstract

The invention discloses an ATS type silicon-aluminum molecular sieve as well as a preparation method and application thereof. The molecular sieve has a schematic chemical composition as shown in the formula SiO2. 1/nAl2O3, wherein a molar ratio n of silicon to aluminum is more than or equal to 6 and less than or equal to 10. The molecular sieve has a long-strip-shaped or rod-shaped morphology, the average length of crystals is 0.6-1.8 microns, and a length-width ratio is 2-20. The molecular sieve can be used as an adsorbent or a catalyst for conversion of organic compounds, and has good performance.

Description

technical field [0001] The invention relates to an ATS type silicon aluminum molecular sieve, its preparation method and application. Background technique [0002] ATS type molecular sieve is a kind of molecular sieve with one-dimensional twelve-membered ring channel, the pore size is 0.65×0.75nm, and its skeleton is made of AlO 4 Tetrahedron and PO 4 Tetrahedrons are alternately linked. Metal atoms are introduced into the molecular sieve framework to generate acidic centers or redox centers, which makes it have potential application value in the field of catalysis. [0003] Shyamal Kumar Saha et al. used tri-n-propylamine Pr 3 N is used as a structure-directing agent to synthesize ATS-type molecular sieves, but the synthesis process is relatively complicated, often requiring a two-step crystallization process, and the product is often mixed with AFI heterophase. IgnatiusY.Chan et al. synthesized ATS molecular sieves using a [1-(3-fluorophenyl)cyclopentyl]methyl-trimethy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/48B01J29/70
CPCC01B39/48B01J29/70C01P2002/72C01P2002/82C01P2004/03Y02P20/52
Inventor 杨为民王振东刘闯李相呈梁俊
Owner CHINA PETROLEUM & CHEM CORP
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