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Ferrierite with high silica-alumina ratio and preparation method and application thereof

A high-silicon-aluminum-ratio ferrierite and ferrierite technology, which is applied in chemical instruments and methods, isomerization hydrocarbon production, unsaturated hydrocarbon addition hydrocarbon production, etc., can solve the problem of improving requirements and increasing synthesis steps System complexity and other issues, to achieve the effect of ensuring utilization rate, simple and easy preparation method, and simplified preparation steps

Active Publication Date: 2020-07-10
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] When synthesizing ferrierite with high silicon-aluminum ratio in the past, it is often necessary to additionally introduce other substances such as fluorine / oxygen additives, surfactants or seeds, which not only increases the synthesis steps and the complexity of the synthesis system, but also adds Fluorine additives or microwave synthesis also increase the requirements for equipment

Method used

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  • Ferrierite with high silica-alumina ratio and preparation method and application thereof
  • Ferrierite with high silica-alumina ratio and preparation method and application thereof
  • Ferrierite with high silica-alumina ratio and preparation method and application thereof

Examples

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Embodiment 1

[0049] Preparation of silicon source mother liquor

[0050] 0.566g of sodium hydroxide and 0.429g of potassium hydroxide were dissolved in 115g of deionized water, then 67.947g of silica sol with a silica content of 30wt% was added dropwise, and the obtained mixture was stirred in a water bath at 70°C for 80min. The molar ratio of the mixture: Na 2 O / SiO 2 =0.0338, K 2 O / SiO 2 =0.0162,H 2 O / SiO 2 = 15.9.

[0051] figure 2 It is the particle size distribution diagram before and after the treatment of the silicon source in Example 1. The particle size distribution of the alkali-treated silica sol at 70°C changes significantly. The average particle size of the initial silicon source in this embodiment is 27.11nm as measured by the laser particle size analyzer. The average particle size of the treated silicon source mother liquor is 25.7nm.

Embodiment 2

[0053] Preparation of silicon source mother liquor

[0054] 1.817g of sodium hydroxide and 1.232g of potassium hydroxide were dissolved in 195g of deionized water, then 124.625g of silica sol with a silica content of 30wt% was added dropwise, and the obtained mixture was stirred in a water bath at 40°C for 30min. The molar ratio of the mixture: Na 2 O / SiO 2 =0.035,K 2 O / SiO 2 =0.015,H 2 O / SiO 2 = 17.4.

[0055] image 3 It is the particle size distribution diagram before and after the treatment of the silicon source in Example 2. The average particle size of the initial silicon source in this embodiment measured by the laser particle size analyzer is 27.11nm, and the average particle size of the treated silicon source mother liquor is 25.03nm.

Embodiment 3

[0057] Preparation of silicon source mother liquor

[0058] 1.817g of sodium hydroxide and 1.232g of potassium hydroxide were dissolved in 195g of deionized water, then 124.625g of silica sol with a silica content of 30wt% was added dropwise, and the obtained mixture was stirred in a water bath at 70°C for 80min. The molar ratio of the mixture: Na 2 O / SiO 2 =0.035,K 2 O / SiO2=0.015, H 2 O / SiO 2 = 17.4.

[0059] Figure 4 It is the particle size distribution diagram before and after the treatment of the silicon source in Example 3. The average particle size of the initial silicon source in this embodiment measured by the laser particle size analyzer is 49.24nm, and the average particle size of the treated silicon source mother liquor is 44.07nm.

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Abstract

The invention provides ferrierite with a high silica-alumina ratio and a preparation method and application thereof. The preparation method comprises the steps that a silicon source and an alkali metal hydroxide solution are mixed and subjected to constant-temperature treatment for 0.5-8 h at the temperature of 20-100 DEG C, silicon source mother liquor is obtained, and the average particle size of the silicon source mother liquor is 5-100 nm; water, an aluminum source, a template agent and the silicon source mother liquor are mixed to prepare silicon-aluminum gel; and the silica-alumina gel is crystallized at 140-200 DEG C for 1-5 days, and the crystallized product is washed, dried and roasted to obtain ferrierite. The ferrierite obtained by the preparation method has high crystallinity,solid yield and silica-alumina ratio and can be used for catalyzing olefin oligomerization and n-butene and n-pentene skeletal isomerization reaction.

Description

technical field [0001] The invention relates to a zeolite and a preparation method thereof, in particular to a preparation method of a ferrierite zeolite with a high silicon-aluminum ratio, and belongs to the technical field of zeolite preparation. Background technique [0002] Ferrierite is an aluminosilicate crystal composed of 5, 6, 8, and 10-membered rings, which belongs to the medium-pore molecular sieve. The main channel structure is composed of ten-membered rings The channel and the eight-membered ring channel perpendicular to it Intersecting two-dimensional layered structure. The unique pore structure of ferrierite makes it widely used in the field of reaction and separation in chemical industry, especially in the skeletal isomerization reaction of n-olefins, which shows good isomerization performance. However, most of the ferrierite molecular sieves currently have a low silicon-aluminum ratio (feeding silicon-aluminum ratio SiO 2 / Al 2 o 3 about 30). Low-si...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/48B01J29/65C07C2/02C07C5/27C07C11/09C07C11/10B82Y30/00B82Y40/00
CPCB01J29/65B82Y30/00B82Y40/00C01B39/48C01P2002/72C01P2004/03C01P2004/62C01P2004/64C07C2/02C07C5/2708C07C11/09C07C11/10
Inventor 黄星亮董乐刘宗俨任俊杰
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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