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Preparation method of binder-free ZSM-5/beta coexisting molecular sieve

A ZSM-5, binder-free technology, applied in the direction of crystalline aluminosilicate zeolite, borocarbane silicone crystalline aluminosilicate zeolite, etc., can solve the problems of complicated preparation process, achieve simplified preparation process and low cost , good catalytic effect

Active Publication Date: 2013-01-09
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 molecular sieve seeds need to be added in the preparation process of the prior art symbiotic molecular sieve, and the preparation process is complicated, and a new binder-free ZSM-5 / β symbiotic zeolite molecular sieve is provided. Preparation

Method used

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  • Preparation method of binder-free ZSM-5/beta coexisting molecular sieve
  • Preparation method of binder-free ZSM-5/beta coexisting molecular sieve
  • Preparation method of binder-free ZSM-5/beta coexisting molecular sieve

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] No seed crystals were used during the preparation.

[0018] Take by weighing 30 grams of white carbon black and 4.8 grams of alumina, add 60 grams of silica sol (SiO 2 The weight percentage is 40%) for kneading and molding, and the shaped catalyst is baked at 100° C. for 3 hours.

[0019] Add 20 grams of triethylamine, 10 grams of tetrapropylammonium hydroxide and 3 grams of distilled water in advance in the reaction kettle, place 60 grams of the above-mentioned cylindrical product in the reaction kettle and seal it above the porous stainless steel mesh and carry out at 120 ° C. Gas-solid phase treatment for 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.

[0020] XRD pattern (see figure 1 ) shows that the product contains the diffraction peaks of ZSM-5 zeolite molecular sieve and beta zeolite molecular sieve, and the main diffraction peak of ZSM-5 zeolite molecular sieve i...

Embodiment 2

[0023] No seed crystals were used during the preparation.

[0024] Take by weighing 40 grams of diatomaceous earth and 6.5 grams of aluminum sulfate, add 45.5 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.

[0025] Add 10 grams of ethylenediamine, 20 grams of tetraethylammonium hydroxide and 10 grams of distilled water to the reaction kettle in advance, place 50 grams of the cylindrical product prepared above in the reaction kettle and seal it above the porous stainless steel mesh and carry out at 150 ° C. Gas-solid phase treatment 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.

[0026] The XRD pattern shows that the product contains the diffraction peaks of ZSM-5 zeolite molecular sieve and β zeolite molecular sieve, and the main diffraction peak of ZSM-5 zeolite molecular sieve is smal...

Embodiment 3

[0029] Take by weighing 30 grams of rice husk ash and 4.8 grams of alumina, add 42.2 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.

[0030] Add 10 grams of ethanolamine, 20 grams of tetrapropylammonium hydroxide and 20 grams of distilled water to the reaction kettle in advance, place 30 grams of the cylindrical product prepared above in the reaction kettle and seal it above the porous stainless steel mesh and carry out gas solidification at 160 ° C. Phase treatment for 3 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.

[0031]The XRD pattern shows that the product contains the diffraction peaks of ZSM-5 zeolite molecular sieve and β zeolite molecular sieve, and the main diffraction peak of ZSM-5 zeolite molecular sieve is smaller than that of β zeolite molecular sieve; SEM photos show that the ...

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Abstract

The invention relates to a preparation method of a binder-free ZSM-5 / beta coexisting zeolite molecular sieve, and mainly aims to solve the problem of complex preparation processes in which a parent molecular sieve crystal seed needs to be added during traditional coexisting molecular sieve preparation. The method comprises the steps of: first mixing and shaping silicon and aluminum raw materials,then selectively converting the silicon and aluminum raw materials into a ZSM-5 and beta zeolite molecular sieve with a mixed aqueous solution of organic amine and organic quaternary ammonium base, thus forming a binder-free ZSM-5 / beta coexisting molecular sieve. The technical method of the invention well solves the above technical problem, and can be used in the industrial production of binder-free ZSM-5 / beta coexisting molecular sieves.

Description

technical field [0001] The invention relates to a method for preparing a binder-free ZSM-5 / beta symbiotic zeolite molecular sieve, in particular to a method for directly mixing and kneading silicon-aluminum raw materials, and then converting the raw materials by gas-solid phase treatment technology to form a non-sticky The preparation method of binder ZSM-5 / beta symbiotic zeolite molecular sieve. Background technique [0002] Zeolite molecular sieves are widely used in the field of catalysis because of their uniform and ordered microporous structure, large specific surface area, and high hydrothermal stability. Due to the small particle size, zeolite powder is very inconvenient in practical application, and has weaknesses such as difficult recovery, easy deactivation and aggregation, so it needs to be shaped in advance. Generally, a binder needs to be added during the molding process, but after adding the binder, on the one hand, the binder has a certain pore blocking effec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/02C01B39/38
Inventor 任丽萍徐建军何万仁滕加伟
Owner CHINA PETROLEUM & CHEM CORP