Method for preparing binderless ZSM5/beta composite zeolite molecular sieve

A technology of ZSM-5 and composite molecular sieve, which is applied in the direction of crystalline aluminosilicate zeolite, borocarbane silicone crystalline aluminosilicate zeolite, etc., can solve the problems of cumbersome preparation process and achieve simplified preparation process, uniform distribution, and improved The effect of intensity

Active Publication Date: 2012-03-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is that two kinds of zeolite molecular sieve seeds need to be added in the preparation process of the traditional binderless composite molecular sieve, and the preparation process is cumbersome. A new binderless ZSM-5 / β composite zeolite molecular sieve is provided The preparation method has the advantage that the preparation process is simple

Method used

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  • Method for preparing binderless ZSM5/beta composite zeolite molecular sieve
  • Method for preparing binderless ZSM5/beta composite zeolite molecular sieve
  • Method for preparing binderless ZSM5/beta composite zeolite molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～2

[0015] In the preparation process, only one seed crystal of zeolite beta is used.

[0016] Take by weighing 5 grams of white carbon black, 6.5 grams of alumina and 70 grams of beta zeolite (SiO 2 / Al 2 o 3 The molar ratio is 30), add 62.5 grams of silica sol (SiO 2 The mass percentage is 40%) for kneading and molding, and the shaped catalyst is baked at 100° C. for 3 hours.

[0017] 15 grams of triethylamine, 10 grams of ethylenediamine and 10 grams of distilled water were added in advance to the reaction kettle, and 60 grams of the above-mentioned cylindrical product was placed in the reaction kettle and sealed above the porous stainless steel mesh, and then the gas-solid phase was carried out at 120 ° C. 3 days of treatment, 6 days. After the product was taken out, it was washed with distilled water, dried in the air and then calcined at 550°C in an air atmosphere.

[0018] Process the product XRD pattern of 3 days (see figure 1 ) shows that the product contains the di...

Embodiment 3

[0020] In the preparation process, only one seed crystal of zeolite beta is used.

[0021] Take by weighing 2.8 grams of sodium metaaluminate and 50 grams of beta zeolite (SiO 2 / Al 2 o 3 Molar ratio is 20), add 90 grams of silica sol (SiO 2 The mass percentage is 40%) for kneading and molding, and the shaped catalyst is baked at 100° C. for 3 hours.

[0022] 50 grams of triethylamine and 10 grams of distilled water were pre-added in the reaction kettle, and 60 grams of the above-prepared cylindrical product was placed in the reaction kettle above the porous stainless steel mesh and sealed and then subjected to gas-solid phase treatment at 180° C. for 5 days. After the product was taken out, it was washed with distilled water, dried in the air and then calcined at 550°C in an air atmosphere.

[0023] The XRD pattern of the product treated for 5 days shows that the main diffraction peak of the zeolite beta molecular sieve is smaller than that of the ZSM-5 zeolite molecular ...

Embodiment 4～6

[0025] Take by weighing 120 grams of white carbon black, 4.2 grams of aluminum sulfate and 10 grams of beta zeolite (SiO 2 / Al 2 o 3 The molar ratio is 50), add 175 grams of silica sol (SiO 2 The mass percentage is 40%) for kneading and molding, and the shaped catalyst is baked at 100° C. for 3 hours.

[0026] A mixture of 30 grams of ethylamine and 3 grams of distilled water was added to the reaction kettle in advance, and 20 grams of the above-prepared cylindrical products were placed in the reaction kettle above the porous stainless steel mesh and sealed, and then gas-solid phase treatment was carried out at 100°C respectively 3, 5 ,8 days. After the product was taken out, it was washed with distilled water, dried in the air and then calcined at 550°C in an air atmosphere.

[0027] The XRD patterns of the products of the three examples all contain diffraction peaks of ZSM-5 and zeolite beta, indicating that the products contain both ZSM-5 and zeolite beta; SEM photos sh...

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Abstract

The invention relates to a method for preparing a binderless ZSM-5/beta composite zeolite molecular sieve, which mainly solves the problems that two types of crystal seeds are required for adding in the traditioanal method for preparing the binderless composite zeolite molecular sieve and the preparation method is complex. According to the invention, a Si and Al raw-material and a beta zeolite molecular sieve are mixed for forming, then the Si and Al raw-material besides beta zeolite molecular sieve is selectively conversed to the ZSM-5 zeolite molecular sieve, so that the binderless ZSM-5/beta composite zeolite molecular sieve is formed. The technical scheme better solves the problems, and can be used in industrial production of the binderless ZSM-5/beta composite zeolite molecular sieve.

Description

technical field [0001] The invention relates to a method for preparing ZSM-5 / beta composite zeolite molecular sieve without binder, in particular to a method for mixing silicon-aluminum raw materials with beta zeolite molecular sieves for kneading and molding, and then converting the silicon-aluminum raw materials by gas-solid phase treatment to form A method for preparing a binder-free ZSM-5 / beta composite zeolite molecular sieve. Background technique [0002] Zeolite molecular sieves have uniform and ordered micropores, large specific surface area, and high hydrothermal stability, and are widely used in the field of catalysis. Due to the small particle size, zeolite powder is not very convenient in practical application, and has weaknesses such as difficult recovery, easy deactivation and aggregation, so it needs to be shaped in advance. Binders are generally required during the molding process, resulting in a reduction in the effective surface area and introducing diffus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/02C01B39/38
Inventor 任丽萍徐建军李斌滕加伟
Owner CHINA PETROLEUM & CHEM CORP
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