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NaY type molecular sieves and preparation method therefor

A molecular sieve and amorphous silica-alumina technology, which is applied in the directions of fajhedral crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., can solve the problems of poor catalytic effect and selectivity, and achieve the effect of improving diffusivity

Active Publication Date: 2016-06-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, ZSM-5 contains MCM-41, and what is obtained is actually a mixture of ZSM-5 and MCM-41 that has been sieved. The catalytic effect and selectivity of sieved are far inferior to pure ZSM-5.

Method used

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  • NaY type molecular sieves and preparation method therefor
  • NaY type molecular sieves and preparation method therefor
  • NaY type molecular sieves and preparation method therefor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] (1) According to the molar ratio n (Na 2 O): n (Al 2 o 3 ): n (SiO 2 ): n (H 2 O)=16:1:18:360, under stirring, add sodium aluminate, water, sodium hydroxide and water glass to the beaker in turn to form a mixed solution, and then age at 25°C for 2 days to obtain the directing agent .

[0031] (2) Under the condition of stirring, add the roasted amorphous silica aluminum, sodium hydroxide, water, water glass and the directing agent prepared in step (1) into the beaker to form a gel system. Constant temperature crystallization at 60°C for 8 hours, then constant temperature crystallization at 90°C for 60 hours, then cooling, washing, suction filtration, and drying to obtain NaY molecular sieves. The molar ratio of each material in the gel system (excluding the added roasted amorphous silica-alumina and directing agent) is n (NaOH): n (SiO 2 ): n (H 2(0)=15.5:12:470, the mass of the added roasted amorphous silica-alumina accounts for 6wt% of the total mass of ...

Embodiment 2

[0033] (1) According to the molar ratio n (Na 2 O): n (Al 2 o 3 ): n (SiO 2 ): n (H 2 O)=18:1:19:350, under stirring, add sodium aluminate, water, sodium hydroxide and water glass to the beaker in turn to form a mixed solution, and then age at 32°C for 1 day to prepare the directing agent .

[0034] (2) Under the condition of stirring, add the roasted amorphous silica aluminum, sodium hydroxide, water, water glass and the directing agent prepared in step (1) into the beaker to form a gel system. Constant temperature crystallization at 65°C for 10 hours, then constant temperature crystallization at 100°C for 48 hours, then cooling, washing, suction filtration, and drying to obtain NaY molecular sieves. The molar ratio of each material in the gel system (excluding the added roasted amorphous silica-alumina and directing agent) is n (NaOH): n (SiO 2 ): n (H 2 (0)=15.5:13:550, the mass of the added roasted amorphous silica-alumina accounts for 10wt% of the total mass...

Embodiment 3

[0036] (1) According to the molar ratio n (Na 2 O): n (Al 2 o 3 ): n (SiO 2 ): n (H 2 O)=16:1:18:340, in the state of stirring, sodium aluminate, water, sodium hydroxide and water glass were added to the beaker in turn to form a mixed solution, and then aged at 40°C for 1.5 days to obtain the directing agent .

[0037] (2) Under the condition of stirring, add the roasted amorphous silica aluminum, sodium hydroxide, water, water glass and the directing agent prepared in step (1) into the beaker to form a gel system. Constant temperature crystallization at 60°C for 12 hours, then constant temperature crystallization at 95°C for 48 hours, then cooling, washing, suction filtration, and drying to obtain NaY molecular sieves. The molar ratio of each material in the gel system (excluding the added roasted amorphous silica-alumina and directing agent) is n (NaOH): n (SiO 2 ): n (H 2 (0)=16:11:480, the mass of the added roasted amorphous silica-alumina accounts for 6wt% o...

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Abstract

The invention discloses NaY type molecular sieves and a preparation method therefor. The molecular sieves have the properties as follows: the mesoporous distribution is 2nm to 6nm, the pore volume of mesopores accounts for 10% to 70% that of micropores and preferably is 20% to 60%, and the specific surface area is 750m<2> / g to 950m<2> / g and preferably is 800m<2> / g to 920m<2> / g; the external specific surface (mesoporous specific surface) is 50m<2> / g to 200m<2> / g and preferably is 100m<2> / g to 160m<2> / g; and the pore volume is 0.40ml / g to 0.60ml / g and preferably is 0.42ml / g to 0.55ml / g. The preparation method comprises the following steps: (1) uniformly mixing sodium hydroxide, an aluminum source, water glass and water, and carrying out aging, so as to obtain a directing agent; and (2) uniformly mixing the directing agent obtained in the step (1), roasted amorphous silica-alumina, sodium hydroxide, water and water glass so as to obtain a gel system, then, carrying out low-temperature crystallization and high-temperature crystallization, and carrying out cooling, solid-liquid separation and drying, thereby obtaining the NaY type molecular sieves. The molecular sieves disclosed by the invention have neat mesoporous distribution; the preparation method is simple in operation and good in repeatability; and the molecular sieves have a broad application prospect in a hydrocracking reaction.

Description

technical field [0001] The invention belongs to the field of molecular sieve synthesis, and in particular relates to a NaY type molecular sieve and a preparation method thereof. Background technique [0002] Y-type zeolite is formed by faujasite cages interpenetrating with each other along three crystal axis directions through twelve-membered rings. It is an excellent catalyst active component, not only has high cracking activity, but also has good selectivity. The discovery and use of Y-type zeolite has epoch-making significance in the field of catalysis. [0003] As crude oil becomes increasingly heavy and inferior, catalytic cracking and hydrocracking of heavy oil and light oil are important processes for deep processing of heavy oil to prepare light oil. Therefore, we put forward higher requirements on the catalytic performance of the catalyst. Microporous zeolite materials are widely used in petroleum refining and petrochemical fields due to their regularly arranged m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/24
Inventor 秦波杜艳泽柳伟张晓萍王凤来
Owner CHINA PETROLEUM & CHEM CORP
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