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Method for preparing NaY molecular sieve by in-situ crystallization

An in-situ crystallization and molecular sieve technology, which is applied in the direction of molecular sieve catalysts, chemical instruments and methods, catalyst activation/preparation, etc., can solve the problem of few reports of in-situ crystallization products

Active Publication Date: 2012-05-23
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are few reports on the synthesis of in situ crystallization products with larger pore sizes of 8-20 nm.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032]With kaolin 3000g (dry basis), in terms of kaolin mass, add water glass 2%, urea 2%, 5% pseudo-boehmite, add deionized water and prepare into a mixed slurry with a solid content of 33%, to obtain a particle size of 3059g Spray microspheres on 20-110 μm kaolin. A part of the microspheres was calcined at 970° C. for 1.5 hours to obtain high soil microspheres GT-1, and the other part was calcined at 870° C. for 2 hours to obtain partial earth microspheres PT-1.

[0033] Take 80g of GT-1 high soil microspheres, 20g of partial soil microspheres PT-1, mix with 930ml of water glass, 320ml of 14wt% sodium hydroxide solution, and 106ml of guiding agent. After stirring for 30 minutes, the mixed solution is put into a stainless steel reaction kettle. Raise the temperature to 96°C for static crystallization at a constant temperature for 28 hours. After the crystallization is completed, the white powder in the solution is removed by settling and washing, and then the filter cake is ...

Embodiment 2

[0035] With kaolin 3000g (dry basis), in terms of kaolin mass, add water glass 4%, silica sol 6%, ethanol 4%, add deionized water and prepare to be the mixed slurry that solid content is 45%, obtain 3140g particle size in 20~ 110 μm kaolin clay spray microspheres. A part of the microspheres was calcined at 940°C for 2.4 hours to obtain high soil microspheres GT-2, and the other part was calcined at 800°C for 2.8 hours to obtain partial earth microspheres PT-2.

[0036] Take 100g of GT-2 high soil microspheres, mix with 740ml of water glass, 383ml of 14wt% sodium hydroxide solution, and 85ml of directing agent. After stirring for 30 minutes, the mixture is put into a stainless steel reaction kettle, heated to 100°C for 20 hours of static crystallization. After the crystallization is completed, the white powder in the solution is removed by settling and washing, and then the filter cake is filtered, washed, and dried to obtain an in-situ crystallization product. Determined by X...

Embodiment 3

[0038] Get Example 2 high soil microsphere GT-260g and 40g partial soil microsphere PT-2 mix and then mix with 1028ml water glass, 238ml14wt% sodium hydroxide solution, 120ml guiding agent, after stirring for 30 minutes, the mixed solution is dropped into stainless steel In the reaction kettle, the temperature was raised to 93°C for 34 hours of static crystallization. After the crystallization is completed, the white powder in the solution is removed by settling and washing, and then the filter cake is filtered, washed, and dried to obtain an in-situ crystallization product. Determined by X-ray diffraction, containing 42% NaY zeolite, N 2 The adsorption shows that the pore volume is 0.50cm 3 / g, the most probable diameter of the mesopore is 11.4nm.

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Abstract

The invention relates to a method for preparing NaY molecular sieve by in-situ crystallization, which comprises the following steps: taking kaolin as a raw material, adding deionized water, decomposing a compound with boiling point at the temperature of less than 150 DEG C or equal to 150 DEG C, spray drying the prepared mixed slurry to obtain the kaolin spray microballoon, roasting, carrying outmixed crystallizing with silicon source, aqueous alkali and a guiding agent, filtering a filter cake, washing and drying; decomposing a compound with boiling point at the temperature of less than 150DEG C, wherein the addition amount accounts for 2-10% of kaolin mass.

Description

technical field [0001] The invention belongs to the field of oil refining catalysts, in particular to a method for preparing NaY molecular sieves by in-situ crystallization using kaolin spray microspheres as raw materials. technical background [0002] Catalytic cracking (FCC) is the main means of heavy oil processing in my country. FCC catalysts are divided into semi-synthetic catalysts and in-situ crystallization catalysts. Semi-synthetic catalysts are prepared by preparing the molecular sieve and matrix separately and then mixing them. The in-situ crystallization type catalyst is obtained by spraying and high-temperature roasting to obtain microspheres containing a certain amount of active silicon-aluminum source, and then prepared by in-situ crystallization reaction. During the preparation process, molecular sieve and matrix are simultaneously formed. The in-situ crystallization catalyst has the advantages of good hydrothermal stability, high conversion rate of heavy oi...

Claims

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Application Information

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IPC IPC(8): C01B39/24B01J29/08B01J37/00
Inventor 熊晓云高雄厚王宝杰刘宏海曹庚振张莉赵红娟王如文赵晓争胡清勋潘志爽
Owner PETROCHINA CO LTD
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