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High-silica octagonal zeolite and synthesizing method thereof

A faujasite and zeolite technology are applied in the field of faujasite and its preparation, can solve the problems of low production efficiency, long crystallization time and the like, and achieve the effects of short synthesis time, low sodium content and reduction of secondary reactions

Active Publication Date: 2007-04-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method simply uses a template agent without the aid of seed crystals, the crystallization time will be very long, and the production efficiency is very low, but this method should be classified as a directing agent method due to the use of seed crystals, and the morphology of zeolite under the electron microscope is polygonal Particles

Method used

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  • High-silica octagonal zeolite and synthesizing method thereof
  • High-silica octagonal zeolite and synthesizing method thereof

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Embodiment 1

[0033] Using silica sol as a silicon source, sodium aluminate as an aluminum source, and tetraethylammonium hydroxide as a template, the zeolite of the invention is synthesized by hydrothermal crystallization. Reactant ingredients molar ratio: n(SiO 2 ):n(template):n(Na 2 O):n(Al 2 o 3 ):n(H 2 (0)=8:0.8:3.5:1:140. Synthesis method: add sodium hydroxide and sodium aluminate into 20% tetraethylammonium hydroxide solution according to the proportion of reactants, mix well and then add silica sol. The above mixture was stirred at 40°C for 6 hours, then aged at room temperature for 24 hours, moved into an autoclave, sealed, and statically crystallized at 110°C for 120h. After crystallization, the product was filtered, washed with water, dried at 110°C, and then calcined at 550°C to remove the template agent to obtain sample A. A SiO 2 / Al 2 o 3 The molar ratio is 7.2, the XRD diagram is shown in Figure 1, and the electron microscope diagram is shown in Figure 3.

Embodiment 2

[0035] The zeolite of the invention is synthesized by hydrothermal crystallization with water glass as silicon source, sodium aluminate as aluminum source and polyethylene glycol 6000 as template. Reactant ingredients molar ratio: n(SiO 2 ):n(template):n(Na 2 O):n(Al 2 o 3 ):n(H 2 (0)=6:0.16:2.0:1:130. Synthesis method: according to the molar ratio of reactants, dissolve sodium hydroxide and sodium aluminate in water, stir for 30 minutes, add polyethylene glycol 6000, continue stirring until dissolved, and then add silica sol. After the above mixture was stirred at 30°C for 12 hours, it was placed at room temperature overnight and then transferred into an autoclave with polytetrafluoroethylene, sealed and crystallized at 110°C for 120h under stirring (100 rpm). After crystallization, the product was filtered, washed with water, dried at 110°C, and then calcined at 550°C to remove the template to obtain sample B. B SiO 2 / Al 2 o 3 The molar ratio is 10.6, the XRD diagr...

Embodiment 3

[0037] The zeolite of the invention is synthesized by hydrothermal crystallization with water glass as silicon source, aluminum chloride as aluminum source and tetraethylammonium hydroxide as template. Reactant ingredients molar ratio: n(SiO 2 ):n(template):n(Na 2 O):n(Al 2 o 3 ):n(H 2 (0) = 15:0.5:6.0:1:170. Synthesis method: Add sodium hydroxide and sodium aluminate into 20% tetrapropyl ammonium hydroxide solution according to the molar ratio of reactants, mix well and then add silica sol. The above mixture was stirred at 40°C for 6 hours, then aged at room temperature for 24 hours, moved into an autoclave, sealed, first crystallized at 110°C at static state for 24h, and then crystallized at 110°C at dynamic state for 48h (stirring speed 200 rpm Minute). After crystallization, the product was filtered, washed with water, dried at 110°C, and then calcined at 550°C to remove the template agent to obtain sample C. C SiO 2 / Al 2 o 3 The molar ratio was 9.1.

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Abstract

The invention discloses a high-silicon octahedra zeolite and preparing method with the molar rate of SiO2 / Al2O3 at 6-20, wherein the XRD spectral analysis belongs to Y-typed zeolite in the octahedra zeolite, whose crystal particle shape displays sheet appearance; producing the product under fitful moulding agent and low alkaline condition without guiding agent (zeolite seed).

Description

technical field [0001] The invention relates to a faujasite and a preparation method thereof, in particular to a high-silicon-aluminum-ratio zeolite with a supercage structure prepared by a template synthesis method under hydrothermal conditions. Background technique [0002] Zeolite molecular sieves are regular crystal structures with unique pore structures, mainly crystalline aluminosilicates. Zeolite molecular sieves come in many varieties, each with pores of a specific size and shape. Zeolite molecular sieves form a ring structure from silicon-oxygen tetrahedrons or aluminum-oxygen tetrahedrons through oxygen bridges, and then further link into various cage structures. Faujasite (FAU-type zeolite) is composed of β cages and hexagonal column cages, and it gets its name from the faujasite cages surrounded by them. Faujasite includes X-type and Y-type. The difference between the two lies in the aluminum content, that is, the silicon-aluminum ratio (SiO 2 / Al 2 o 3 ) is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/20
Inventor 陈松
Owner CHINA PETROLEUM & CHEM CORP
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