Mordenite/beta zeolite/Y zeolite coexisting material and method for synthesizing same

Abstract

The invention relates to a mordenite / beta zeolite / Y zeolite coexisting material 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 mordenite / beta zeolite / Y zeolite coexisting material by adding a seed crystal containing a Y zeolite precursor during a synthesis process of mordenite / beta zeolite / Y zeolite coexisting material. A mole relation of the components of the synthesized mordenite / beta zeolite / Y zeolite coexisting material is nSiO2 :Al2O3, wherein n is between 4 and 400; the XRD diffraction pattern of the mordenite / beta zeolite / Y zeolite coexisting material comprises a technical proposal that a maximum value of a distance d is at positions between 14.52-0.1 and 14.52+0.1 A, 13.52-0.1 and 13.52+0.1 A,11.32-0.1 and 11.32+0.1 A, 8.96-0.1 and 8.96+0.1 A, 6.71-0.1 and 6.71+0.1 A, 5.71-0.1 and 5.71+0.1 A, 4.51-0.05 and 4.51+0.05 A, 4.15-0.05 and 4.15+0.05 A, 3.97-0.05 and 3.97+0.05 A, 3.78-0.05 and 3.78 +0.05 A, 3.51-0.05 and 3.51+0.05 A, 3.02-0.05 and 3.02+0.05 A, and 2.86-0.1 and 2.86+0.1 A; therefore, the problems are solved well. The mordenite / beta zeolite / Y zeolite coexisting material can be used in the industrial production of ethylene and propylene through the catalytic pyrolysis of naphtha.

Description

technical field

[0001] The invention relates to a mordenite / beta zeolite / Y zeolite symbiotic material and a synthesis method thereof. Background technique

[0002] Beta zeolite and mordenite (MOR) 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 mordenite / beta zeolite / Y zeolite symbiotic material containing more than two components has a multi-level pore structure and a wide distribution range of strong and weak acids. It can handle complex components with different molecular diameters and can exert their synergistic catalysis effect.

[0003] Documents CN1565967A and CN1565970A report using ZSM-5 molecular sieve or mor...

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