Octagonal zeolite synthesizing method

A synthesis method and technology of faujasite zeolite are applied in the directions of faujasite crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., which can solve problems such as limitations in the synthesis process, and achieve low sodium content, high acidity, and short synthesis time. Effect

Active Publication Date: 2008-11-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In addition, the above-mentioned prior art uses organic ammonium as a template, which has certain restrictions on the synthesis process, and the synthesis process has certain environmental problems (exhaust gas and waste water).

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0027] Using silica sol as a silicon source, sodium aluminate (containing sodium hydroxide) as an aluminum source, polyethylene glycol 400 as a template, and hydrothermal crystallization to synthesize the zeolite of the present invention. Reactant ingredients molar ratio: n(SiO 2 ): n(Na 2 O):n(template):n(Al 2 o 3 ):n(H 2 (0)=6:1.5:1.0:1:80. Synthesis method: Add sodium hydroxide and sodium aluminate into water according to the ratio of reaction materials, stir for 30 minutes, add polyethylene glycol 400, continue stirring until dissolved, and then add silica sol. After the above mixture was stirred at 50°C for 24 hours, it was placed at room temperature for 24 hours, then moved into an autoclave with polytetrafluoroethylene, sealed, and statically crystallized at 110°C for 150 hours. After the crystallization is completed, the product is filtered, washed with water, dried at 110° C., and then calcined at 550° C. to remove the template agent to obtain a zeolite sample of...

example 2

[0029] Using silica sol as a silicon source, sodium aluminate (containing sodium hydroxide) as an aluminum source, polyethylene glycol 1000 as a template, and hydrothermal crystallization to synthesize the zeolite of the present invention. Reactant ingredients molar ratio: n(SiO 2 ): n(Na2 O):n(template):n(Al 2 o 3 ):n(H 2 (0) = 12:2.0:1.8:1:130. Synthesis method: Add sodium hydroxide and sodium aluminate into water according to the ratio of reaction materials, stir for 30 minutes, add polyethylene glycol 1000, 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 dynamically at 105°C (stirring speed 100 rpm) for 100 hours. After the crystallization is completed, the product is filtered, washed with water, dried at 110° C., and then calcined at 550° C. to remove the template ...

example 3

[0031] The zeolite of the invention is synthesized by hydrothermal crystallization with water glass as silicon source, sodium aluminate as aluminum source and polyethylene glycol 400 as template. Reactant ingredients molar ratio: n(SiO 2 ): n(Na 2 O):n(template):n(Al 2 o 3 ):n(H 2 (0) = 15:4.0:5.0:1:160. Synthesis method: according to the ratio of reaction materials, add sodium aluminate into water, stir for 30 minutes, add polyethylene glycol 400, continue stirring until dissolved, and then add water glass. After the above mixture was stirred at room temperature for 24 hours, it was transferred into an autoclave with polytetrafluoroethylene, sealed, and crystallized dynamically at 125° C. (stirring speed 200 rpm) for 12 hours, and then crystallized statically for 60 hours. After the crystallization is completed, the product is filtered, washed with water, dried at 110° C., and then calcined at 550° C. to remove the template agent to obtain a zeolite sample of the present...

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Abstract

The invention discloses a synthesizing method of high-silicon aluminium rate octahedra zeolite, which is characterized by the following: synthesizing under alkaline condition to do hydrothermal crystallization; adopting low-molecular polyalcohol compound as moulding agent without zeolite seed; synthesizing the product in the hydrothermal condition directly.

Description

technical field [0001] The invention relates to a method for synthesizing faujasite, in particular to a method for synthesizing faujasite by using a template agent 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 different, generally the X type is about 2-3, and t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/20
Inventor 陈松刘利军张晓萍谷明镝
Owner CHINA PETROLEUM & CHEM CORP
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