Y zeolite preparation

A zeolite modification technology, which is applied in the field of Y-type zeolite modification, can solve the problems of crystallinity decrease and affect the catalytic performance of zeolite, and achieve good catalytic performance, high hydrocracking activity and activity stability.

Inactive Publication Date: 2004-09-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the Y-type zeolite obtained by the above method has improved stability, as the silicon-aluminum ratio decreases (shrinkage of the unit cell constant), the acid centers of the zeolite decrease, the crystallinity decreases, and a large amount of non-framework aluminum is generated in the zeolite. , the presence of non-framework aluminum in zeolites also directly affects the catalytic performance of zeolites

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0022] The following examples illustrate the methods provided by the invention.

[0023] (1) NaY zeolite (unit cell constant is 24.72 angstroms, silicon aluminum ratio SiO 2 / Al 2 o 3 5.2, the sodium oxide content is 12% by weight, Changling Refinery Catalyst Factory) is mixed with the ammonium chloride aqueous solution of 2.3 mol / liter with concentration, and the liquid-solid weight ratio is 10, is warming up to 95 ℃, carries out ionization under stirring Exchange for 1 hour, filter, wash the solid product with deionization until no chloride ion is detected, and dry at 120° C. to obtain a Y-type zeolite with a sodium oxide content of 4.8% by weight.

[0024] (2) 60 grams of Y-type zeolite of 4.8 weight % in the sodium oxide content obtained by weighing, mix with 40 grams of deionized water, 5 grams of ammonium chloride and 10 grams of concentration in ammonia solution of 25 weight %, and place the mixture in Put it in a closed container, and use a suction filter to extract...

example 2

[0034] This example illustrates the method provided by the invention.

[0035] Prepare Y-type zeolite by the method for example 1, difference is not to extract the air in the described airtight container, under described contact condition, adjust the content of air, make in gaseous phase be made up of water vapor and ammonia component and chlorine component The content of the gas mixture is 50 volume%, and the air content is 50 volume%, and the Y-type zeolite Z prepared by the method provided by the invention is obtained. 2 . Z 2 The physicochemical properties are listed in Table 1.

example 3-4

[0040] The following examples illustrate the methods provided by the invention.

[0041] Prepare Y-type zeolite by the method for example 1, difference is that contact temperature is respectively 650 ℃ and the consumption of 500 ℃ water is respectively 21 grams and 200 grams, and the consumption of ammoniacal liquor is respectively 15 grams and 1 gram, and the consumption of ammonium chloride is respectively 10 grams and 4 grams, the gas phase composition is respectively 20.1% by weight of ammonia, 13.6% by weight of chlorine, all the other being water and 2.1% by weight of ammonia, 1.3% by weight of chlorine, all the other being water, and the contact time is respectively 1 hour and 2 hours, obtain the Y type zeolite Z prepared by the method provided by the invention 3 and Z 4 . Z 3 and Z 4 The physicochemical properties are listed in Table 1.

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Abstract

A process for preparing Y-type zeolite features that a raw Y-type zeolite is contacted with an atomsphere at 450-700 deg.C for 1-10 hr. Said atmosphere contains water vapour, ammonia component, chlorine component and / or fluorine components.

Description

technical field [0001] The present invention relates to a method for modifying faujasite, more specifically to a method for modifying Y-type zeolite. Background technique [0002] Y-type zeolite can be used as an adsorbent and an active component of various catalysts, such as cracking catalysts and hydrocracking catalysts. Since the Y-type zeolite with a larger unit cell constant (more than 24.60 Angstroms) has a lower silica-alumina ratio and more acid centers, it is particularly suitable as an active component of a hydrocracking catalyst. However, the prominent disadvantages of this Y-type zeolite are low thermal stability and low crystallinity after calcination. In order to improve the stability of Y-type zeolite, Y-type zeolite is often super-stabilized to prepare ultra-stable Y zeolite. The most common method for ultra-stabilizing Y-type zeolite is the hydrothermal method, that is, contacting Y-type zeolite with an atmosphere containing water...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/24
Inventor 毛以朝聂红史建文石亚华王锦业
Owner CHINA PETROLEUM & CHEM CORP
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