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Preparation method of binder-free molecular sieve catalyst

A binder-free, molecular sieve technology, applied in molecular sieve catalysts, catalyst activation/preparation, chemical instruments and methods, etc., can solve problems such as poor mechanical strength, achieve stable structure, complete transformation, and overcome poor mechanical strength.

Active Publication Date: 2022-05-06
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to provide a new preparation method of a binderless molecular sieve catalyst for the poor mechanical strength of the binderless molecular sieve catalyst in the prior art, which can obtain a binderless molecular sieve catalyst with high mechanical strength. Binder molecular sieve catalyst, the catalyst is applied to the reaction of C4 olefin cracking to propylene, with high reaction stability, high propylene selectivity and good regeneration performance

Method used

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  • Preparation method of binder-free molecular sieve catalyst

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preparation example Construction

[0026] The invention provides a method for preparing a binder-free molecular sieve catalyst, the specific process comprising:

[0027] (1) Knead the original molecular sieve powder and the binder to obtain a molded body, and undergo the first drying (drying at 80-120°C for 5-10 hours) to obtain the catalyst precursor I; The amount of powder accounts for 20% to 80%, and the amount of binder accounts for 20% to 80%;

[0028] In the above technical solution, the molecular sieve is at least one of zeolite molecular sieves with FAU, MFI, CHA and MOR structures, preferably, the molecular sieve is at least one of ZSM-5 and MOR. The silicon-aluminum molar ratio SiO of described molecular sieve raw powder 2 / Al 2 o 3 10-1000, preferably 10-800. The binder used is selected from one or more of silica sol, water glass and alumina;

[0029] In the above technical solution, the molded body is columnar, the cross-section of the cylinder is circular, square, four-leaf clover, clover, rin...

Embodiment 1

[0040] 30 g SiO 2 / Al 2 o 3 Mole ratio is 100 ZSM-5 molecular sieves, 30 grams of silica sol (SiO 2 The mass content is 40%), kneaded, extruded into particles with a diameter of 0.4 cm, a length of 0.3-1.0 cm, and a circular cross section, and dried at 120° C. for 8 hours. Add 10 grams of 50% ethylamine aqueous solution into a closed reaction kettle, place the above-mentioned particle sample above the reaction kettle, and perform gas-solid treatment at 190° C. for 24 hours. After the product was taken out, it was dried at 120°C for 8 hours, and then calcined at 550°C for 4 hours in the air atmosphere of a muffle furnace to obtain a binder-free ZSM-5 molecular sieve. Add 100 grams of aqueous solution containing 3% ammonium acetate (mass content) and 1% acetic acid (mass content) mixture in a closed reactor, place 10 grams of the above-mentioned ZSM-5 molecular sieve catalyst in the reactor, heat to 70 ° C for 20 After taking out the product, wash it with distilled water, dr...

Embodiment 2

[0044] 30 g SiO 2 / Al 2 o 3 Mole ratio is 100 ZSM-5 molecular sieves, 30 grams of silica sol (SiO 2 The mass content is 40%), kneaded, extruded into particles with a diameter of 0.4 cm, a length of 0.3-1.0 cm, and a circular cross section, and dried at 120° C. for 8 hours. Add 10 grams of a mixed solution of triethylamine and water with a mass content of 50% in a closed reaction kettle, place the above-mentioned particle samples above the reaction kettle, and perform gas-solid treatment at 190° C. for 24 hours. After the product was taken out, it was dried at 120°C for 8 hours, and then calcined at 550°C for 4 hours in the air atmosphere of a muffle furnace to obtain a binder-free ZSM-5 molecular sieve. Add 100 grams of an aqueous solution containing a mixture of 0.2% ammonium acetate (mass content) and 0.1% acetic acid (mass content) in a closed reactor, place 100 grams of the above-mentioned ZSM-5 molecular sieve catalyst on the upper layer of the reactor, and heat it to ...

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Abstract

The invention discloses a preparation method of a binder-free molecular sieve catalyst and the binder-free molecular sieve catalyst prepared by the method. The method comprises the following steps: contacting a binder-free molecular sieve catalyst precursor with an electrolyte-containing solution, carrying out secondary drying and secondary roasting, and carrying out ammonium exchange treatment to obtain the binder-free molecular sieve catalyst. The average crushing strength of the binder-free molecular sieve catalyst prepared by the method can reach 55-100N / 5mm, and the binder-free molecular sieve catalyst can be used in industrial production of catalysts. The catalyst disclosed by the invention is applied to a reaction for preparing olefin by cracking C4, and is good in reaction selectivity, high in catalyst stability and good in regeneration performance.

Description

technical field [0001] The invention relates to a preparation method of a binderless molecular sieve catalyst with high mechanical strength. Background technique [0002] Zeolite molecular sieves are widely used in the field of catalysis because of their uniform and ordered micropores, large specific surface area, and high hydrothermal stability. Due to the small particle size of zeolite powder, it is very inconvenient in practical application, and has disadvantages such as difficult recovery, easy deactivation and aggregation, so it needs to be shaped in advance. In the molding process, it is generally necessary to add a binder. The binder content generally accounts for 30% to 40% of the total weight of the catalyst, or even higher, so that the catalyst has a specific shape and a certain mechanical strength. From this point of view, Binder is necessary. However, the binder is generally an inert component, and the addition of the binder essentially has a "dilute" effect on...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40B01J35/00B01J37/08B01J37/30C07C4/06C07C11/06
CPCB01J29/40B01J37/08B01J37/30C07C4/06B01J2229/37B01J2229/38B01J2229/26B01J35/30C07C11/06Y02P20/52
Inventor 徐建军任丽萍滕加伟赵国良李斌
Owner CHINA PETROLEUM & CHEM CORP
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