Binderless ZSM-5/beta symbiotic molecular sieve catalyst and preparation method thereof

A ZSM-5, symbiotic molecular sieve technology, applied in molecular sieve catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problems of low propylene selectivity, poor catalyst stability, etc. Improved stability and cost-effective effects

Inactive Publication Date: 2015-03-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the technical problems to be solved by the present invention is the problem of poor catalyst stability and low propylene selectivity in the existing C4-olefin cracking reaction to propylene, and a binder-free ZSM-5 / β symbiotic molecular sieve catalyst is provided

Method used

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  • Binderless ZSM-5/beta symbiotic molecular sieve catalyst and preparation method thereof
  • Binderless ZSM-5/beta symbiotic molecular sieve catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Weigh 30 grams of white carbon black and 4.8 grams of alumina, add 60 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.

[0027] Add 20 grams of triethylamine, 10 grams of tetrapropylammonium hydroxide and 3 grams of distilled water in advance in the reactor, and place 60 grams of the above-mentioned cylindrical product in the reactor after sealing the porous stainless steel mesh top, and then heat it under hydrothermal conditions. Under the condition of controlling the growth direction of molecular sieve crystals, the gas-solid phase treatment was carried out at 120°C 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. It was exchanged three times with 5% ammonium nitrate solution at 80°C, dried and calcined in a muffle furnace at 550°C for 8 hours to obtain a binderless ZSM-5 / β symbiotic z...

Embodiment 2

[0030] Weigh 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.

[0031] Add 10 grams of ethylenediamine, 20 grams of tetraethylammonium hydroxide and 10 grams of distilled water in advance in the reactor, place 50 grams of the above-mentioned cylindrical product in the reactor and seal it above the porous stainless steel mesh, and heat it under hydrothermal conditions. Under the condition of controlling the growth direction of molecular sieve crystals, the gas-solid phase treatment was carried out at 150° 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. It was exchanged three times in 5% ammonium chloride solution at 90°C, dried and calcined in a muffle furnace at 600°C for 4 hours to obtain a binderless ZSM-5 / β symbio...

Embodiment 3

[0035] Weigh 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.

[0036] Add 10 grams of ethanolamine, 20 grams of tetrapropylammonium hydroxide and 20 grams of distilled water in advance in the reactor, place 30 grams of the above-mentioned cylindrical product in the reactor and seal it above the porous stainless steel mesh, under hydrothermal conditions, The growth direction of molecular sieve crystals is controlled, and gas-solid phase treatment is carried out at 160° C. 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. It was exchanged three times in a 5% ammonium nitrate solution at 90°C, dried and calcined in a muffle furnace at 500°C for 4 hours to obtain a binderless ZSM-5 / β symbiotic molecular sieve catalyst with a shape index o...

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Abstract

The invention relates to a binderless ZSM-5/beta symbiotic molecular sieve catalyst and a preparation method thereof. The binderless ZSM-5/beta symbiotic molecular sieve catalyst is mainly used for solving the problems in the prior art that the activity is relatively low when the prepared ZSM-5/beta symbiotic zeolite molecular sieves contain binders and the strength is relatively poor when the prepared ZSM-5/beta symbiotic zeolite molecular sieves do not contain the binders. According to the binderless ZSM-5/beta symbiotic molecular sieve catalyst and the preparation method thereof, through adopting the technical scheme of firstly carrying out mixed shaping on silicon and aluminum raw materials, then, converting the silicon and aluminum raw materials into ZSM-5 and beta zeolite molecular sieves with the shape index of 3-100 by using a mixed aqueous solution of organic amine and organic quaternary ammonium base, and carrying out modification, thereby forming the binderless ZSM-5/beta symbiotic zeolite molecular sieve catalyst; the problems are better solved, and the prepared binderless ZSM-5/beta symbiotic molecular sieve catalyst with the shape index of 3-100 can be applied to the industrial production of preparing propene through cracking alkenes.

Description

technical field [0001] The invention relates to a binder-free ZSM-5 / beta symbiotic molecular sieve catalyst and a preparation method thereof. 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 effect on the molecular sieve, which affects the diffusion performance; on the other hand, the addition of the binder also substantially affects the molecular sieve. The active center has a "dilution" effect, making the actual reaction space velocity larger, lead...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/80C07C11/06C07C4/06
CPCY02P20/52
Inventor 任丽萍李斌徐建军滕加伟
Owner CHINA PETROLEUM & CHEM CORP
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