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Core-shell structured molecular sieve, its production and use

A technology of core-shell structure and molecular sieve, which is applied in the direction of molecular sieve catalyst, molecular sieve and alkali exchange phosphate, chemical instruments and methods, etc., can solve the problems such as the application of molecular sieve that are not given, and achieve good catalytic cracking performance and high yield effect

Active Publication Date: 2007-06-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The patent also discloses a preparation method of a ZSM-5 core / SAPO shell molecular sieve, wherein the mass ratio of the oxides forming the core and the shell is 1:1, but does not give the application of this molecular sieve

Method used

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  • Core-shell structured molecular sieve, its production and use
  • Core-shell structured molecular sieve, its production and use
  • Core-shell structured molecular sieve, its production and use

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preparation example Construction

[0019] The preparation method of the molecular sieve provided by the present invention comprises stirring and mixing the silicon-containing compound and the acidified aluminum-containing compound solution uniformly, adding an organic template to prepare a mixture, mixing the mixture with a water-dispersed silicoaluminophosphate molecular sieve, and making the mixture The molar ratio of each substance is:

[0020] SiO 2 : Al 2 o 3 :Na 2 O:P 2 o 5 :R:H 2 O=(10~500):1:(5~100):(0.1~20):(3~100):(1000~10000), wherein R is an organic templating agent, and the amount of SAPO-11 added is based on P 2 o 5 The number of moles, and then crystallized at 120 ~ 200 ° C, filtered, washed, dried and roasted.

[0021] In the above method, the molar ratio of each substance in the mixture is preferably:

[0022] SiO 2 : Al 2 o 3 :Na 2 O:P 2 o 5 :R:H 2 O=(30-300):1:(8-90):(0.1-10):(10-80):(1000-7000). The suitable drying temperature for the molecular sieve obtained after crystalli...

example 1

[0036] Prepare molecular sieve A with core-shell structure according to the present invention.

[0037] (1) Take 10 grams of water glass (SiO 2 content is 28.8% by mass) mixed with 10 milliliters of deionized water and stirred evenly; get 0.34 gram of aluminum sulfate [Al 2 (SO 4 ) 3 18H 2 [0], 0.94 gram of concentrated sulfuric acid (purity > 95% by mass) and 15 milliliters of deionized water are mixed and stirred evenly to make a solution; the above-mentioned diluted water glass and the acidified aluminum sulfate are mixed, and 1.09 gram of ethylamine is added as a templating agent , mix and stir well to make mixture a;

[0038] (2) Get 0.24 grams of SAPO-11 molecular sieve powder and 3 milliliters of deionized water to stir and disperse evenly, add to mixture a and stir and mix evenly, and the molar ratio of each substance calculated by oxide is:

[0039] SiO 2 :Al 2 o 3 :Na 2 O:P 2 o 5 :R:H 2 O=96:1:28.3:2:50:3111, the amount of SAPO-11 was determined by P 2 o...

example 2

[0044] Prepare molecular sieve B with core-shell structure according to the present invention.

[0045] (1) Get 30 grams of water glass (SiO 2 content is 28.8% by mass) mixed with 10 milliliters of deionized water and stirred evenly; get 0.34 gram of aluminum sulfate [Al 2 (SO 4 ) 3 18H 2 [0], 0.94 gram of sulfuric acid (purity>95% quality) and 15 milliliters of deionized water are mixed and stirred; the above two mixtures are mixed with 2.50 grams of propylamine and stirred to make mixture b.

[0046] (2) Get the SAPO-11 molecular sieve of 1.2 grams and mix with 6 milliliters of deionized water and stir and disperse evenly, join in the mixture b and stir and mix evenly, the molar ratio of described each material is calculated by oxide is:

[0047] SiO 2 :Al 2 o 3 :Na 2 O:P 2 o 5 :R:H 2 O=288:1:85.2:10:85:5560, the addition amount of SAPO-11 is expressed by P 2 o 5 In terms of moles, Al in SAPO-11 2 o 3 Al with aluminum sulfate 2 o 3 The molar ratio is 10:1. ...

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Abstract

A molecular sieve with aluminum phosphor-silicate molecular sieve kernel and Pentasil molecular sieve shell structure in proportion of 1:1-20:1 proportion and its production are disclosed. The process is carried out by mixing silicate-containing compound with aluminum-containing compound solution, agitating, adding into organic template agent to obtain mixture, mixing it with dispersed aluminum phosphor-silicate molecular sieve in proportion of SiO2:Al203:Na2O:P2O5:R:H2O=(10-500): 1(5-100): (0.1-20): (3-100): (1000-10000), crystallizing at 120-200degree, filtering, washing, drying and sintering. It can be used for light-hydrocarbon cracking reaction and has more output.

Description

technical field [0001] The invention relates to a molecular sieve with a core-shell structure and its preparation method and application, specifically, a molecular sieve with a core-shell structure containing Pentasil molecular sieve, its preparation method and its application in the catalytic cracking process of light hydrocarbons. Background technique [0002] The significant differences between ZSM-5 zeolite molecular sieve and other types of zeolite molecular sieves are: (1) its silicon-aluminum ratio can be changed from 10 to the maximum value, and even form all-silica zeolite; (2) it has a special three-dimensional pore structure and pore size; (3) ) has strong acidity, and the acidity is easy to adjust. Therefore, as an excellent catalytic material, ZSM-5 molecular sieve has been widely used in oil refining and chemical production, mainly for catalytic cracking, hydrocracking, isomerization, aromatics alkylation, toluene disproportionation and alkylation Catalytic re...

Claims

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Application Information

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IPC IPC(8): C01B39/54C01B39/02C01B39/38B01J29/04
Inventor 张昕王建伟钟进姚志龙刘爱松高俊魁
Owner CHINA PETROLEUM & CHEM CORP
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