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Method for improving mechanical strength of binder-free molecular sieve catalyst

A Binderless, Mechanically Strong Technology

Active Publication Date: 2017-09-22
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual synthesis process, if the conditions are not properly controlled or the type of silica is not selected properly, the strength of the obtained binderless molecular sieve catalyst is poor or even crushed.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Weigh 10 grams of ZSM-11 molecular sieve, add 6.25 grams of 40% (weight) silica sol, mix, extrude, and dry at 120° C. to obtain sample B. A mixture of 5 grams of tetrabutylammonium bromide, 10 grams of 1,6-hexanediamine and 30 grams of distilled water was added to the reaction kettle in advance, and 12 grams of sample B was placed in the reaction kettle above the porous stainless steel mesh and sealed at 180 ° C. The gas-solid phase treatment was carried out for 72 hours. After the product was taken out, it was washed with distilled water, dried, and calcined at 550°C for 2 hours, and the catalyst obtained was designated as Sample-B. The ratio of the sum of the characteristic diffraction peak intensities of the XRD pattern of Sample-B to ZSM-11 is 127%, that is, the synthesized Sample-B is a binderless molecular sieve catalyst at this time, and its mechanical strength (pressure measurement) is 48N / cm.

[0019] Immerse 10g of Sample-B in 20ml of aluminum nitrate solutio...

Embodiment 2

[0021] Weigh 10 grams of ZSM-5 molecular sieve, add 12 grams of 40% (weight) silica sol to mix, extrude, and dry at 120°C to obtain sample C; add 10 grams of tripropylammonium bromide to the reaction kettle in advance The mixture of 20 grams of distilled water, 12 grams of sample C was placed in the reaction kettle above the porous stainless steel mesh and sealed, and then carried out gas-solid phase treatment at 180 ° C for 98 hours. After the product was taken out, it was washed with distilled water, dried, and calcined at 550°C for 2 hours, and the catalyst obtained was designated as Sample-C. The ratio of the sum of the characteristic diffraction peak intensities of the XRD pattern of Sample-C to that of ZSM-5 is 150%, that is, the synthesized Sample-C is a binderless molecular sieve catalyst at this time, and its mechanical strength (pressure measurement) is 37N / cm.

[0022] Immerse 10g of Sample-C in 20ml of aluminum chloride solution, the amount of impregnated aluminum ...

Embodiment 3

[0025] Weigh 10 grams of ZSM-5 / 11 molecular sieve, add 20 grams of water glass with a silicon dioxide content of 20% (weight), mix, extrude, and dry at 120° C. to obtain sample D. A mixture of 4 grams of 1,6-hexamethylenediamine and 15 grams of distilled water was added to the reaction kettle in advance, 12 grams of sample C was placed in the reaction kettle above the porous stainless steel mesh and sealed, and then gas-solid phase treatment was performed at 175°C for 90 hours. After the product was taken out, it was washed with distilled water, dried, and calcined at 550°C for 2 hours, and the catalyst obtained was designated as Sample-D. The ratio of the sum of the characteristic diffraction peak intensities of the XRD spectrum of Sample-D to ZSM-5 / 11 is 140%, that is, the synthetic Sample-D is a binderless molecular sieve catalyst at this time, and the mechanical strength (pressure measurement) is 40N / cm .

[0026] 10g Sample-D was impregnated in 20ml of aluminum phosphate...

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Abstract

The invention aims to provide a method for improving the mechanical strength of a binder-free molecular sieve catalyst, and belongs to the field of petrochemical industry. The method includes following specific steps that the binder-free molecular sieve catalyst is soaked into an aluminum salt solution for 1-3 hours, and after drying and calcination, a sample with required strength is obtained, wherein the binder-free molecular sieve catalyst is soaked in the aluminum salt by means of an equal-quantity method, and the content of aluminum salt in the form of aluminum trioxide in the catalyst is 1-30 wt%. Compared with the simply synthesized binder-free molecular sieve catalyst, the mechanical strength of the sample obtained by means of the method can be adjusted and controlled, and the crystallinity is kept high.

Description

technical field [0001] The invention belongs to the field of petrochemical industry, and in particular relates to a method for improving the mechanical strength of a binder-free molecular sieve catalyst. Background technique [0002] Molecular sieves have uniform and ordered micropores and a large specific surface, and are widely used in the field of catalysis. Usually the synthesized molecular sieve is in the form of very fine powder, only a few microns, but for a catalyst for industrial application, the catalyst is required to have a certain shape and mechanical strength, otherwise, many adverse effects will be caused by the pressure of the load in the application Consequences and even forced to stop. In order to meet the requirements of practical applications, fine molecular sieve powders often need to form molecular sieve catalysts of different shapes together with inorganic binders. In order to ensure that molecular sieve catalysts of different shapes have correspondi...

Claims

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Application Information

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IPC IPC(8): B01J37/02B01J37/08B01J35/00B01J29/40
CPCB01J29/40B01J37/0009B01J2229/40B01J2229/26B01J35/30
Inventor 刘盛林张琬铄张爽徐龙伢辛文杰谢素娟
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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