ZSM-5/beta zeolite/MCM-49 triphase coexisting molecular sieve and method for synthesizing same

A symbiotic molecular sieve, MCM-49 technology, applied in the direction of molecular sieves and alkali exchange compounds, chemical instruments and methods, crystalline aluminosilicate zeolites, etc., can solve the problems of low activity, single pore size of porous materials, weak acidity, etc., to achieve The effect of good catalytic performance and good technical effect
CN101514019AActive Publication Date: 2009-08-26SHANGHAI RES INST OF PETROCHEMICAL TECH SINOPEC
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
SHANGHAI RES INST OF PETROCHEMICAL TECH SINOPEC
Publication Date
2009-08-26

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Abstract

The invention relates to a ZSM-5 / beta zeolite / MCM-49 triphase coexisting molecular sieve and a method for synthesizing the same, and mainly solves the problems that a porous material synthesized by the prior art is single in pore-size, weak in acid and low in activity. The method prepares the ZSM-5 / beta zeolite / MCM-49 triphase coexisting molecular sieve by adding a seed crystal containing an MCM-49 precursor during a synthesis process of diphase coexisting molecular sieve. A mole relation of the components of the synthesized triphase coexisting molecular sieve is nSiO2 :Al2O3, wherein n is between 10 and 1,000; the triphase coexisting molecular sieve has more than three phases; the XRD diffraction pattern of the triphase coexisting molecular sieve comprises a technical proposal that a maximum value of a distance d is at positions between 12.26-0.1 and 12.26+0.1 A, 11.32-0.04 and 11.32+0.04 A, 11.22-0.04 and 11.22+0.04 A, 11.08-0.05 and 11.08+0.05 A, 9.97-0.1 and 9.97+0.1 A, 8.82-0.1 and 8.82+0.1 A, 7.74-0.1 and 7.74+0.1 A,6.14-0.1 and 6.14+0.1 A, 5.14-0.1 and 5.14+0.1 A, 4.15-0.1 and 4.15+0.1 A, 3.90-0.05 and 3.90+0.05 A,3.71-0.1 and 3.71+0.1 A,3.45-0.05 and 3.45+0.05,3.29-0.04 and 3.29+0.04 A ,3.20-0.04 and 3.29+0.04 A ,3.08-0.04 and 3.08+0.04 A, and 2.98-0.05 and 2.98+0.05 A; therefore, the problems are solved well. The triphase coexisting molecular sieve can be used in the industrial production of ethylene and propylene through the catalytic pyrolysis of naphtha.
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Description

technical field

[0001] The invention relates to a ZSM-5 / beta zeolite / MCM-49 three-phase symbiotic molecular sieve and a synthesis method thereof. Background technique

[0002] Beta zeolite and ZSM-5 porous materials are widely used in petrochemical and other fields due to their good shape-selective catalytic performance and good thermal stability. However, because the two molecular sieve materials have uniform and single pore size, weak acidity, low activity and poor selectivity, they cannot process complex components separately, and their catalytic properties for the same reactant are different. The three-phase symbiotic molecular sieve containing more than two components has a multi-level pore structure and a wide range of strong and weak acids. It can handle complex components with different molecular diameters and exert their synergistic catalytic effect.

[0003] Documents CN1565967A and CN1565970A report using mordenite or ZSM-5 as a seed crystal, respectively adding ...

Claims

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