Strong-acidity FAU type molecular sieve and preparation method thereof

By doping Zr into the skeleton of the FAU molecular sieve and performing homocrystal substitution reaction with gas-phase SiCl4, the problem of increasing the strong acidity content of FAU molecular sieve is solved, and the combination of high silicon-rhenium ratio and high crystallinity is achieved, simplifying the production process and reducing costs.

CN119637896AActive Publication Date: 2025-03-18PETROCHINA CO LTD +1
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Patent Information

Application Number
CN202311203470.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2023-09-18
Publication Date
2025-03-18
Estimated Expiration
2043-09-18

AI Technical Summary

Technical Problem

The prior art is difficult to greatly increase the strong acid content of FAU molecular sieve under the conditions of ensuring high crystallinity and high silicon-aluminum ratio, especially in catalyst applications, there are problems such as catalyst carbon deposits, low selectivity and short life.

Method used

By doping Zr elements into the skeleton of the FAU-type molecular sieve and performing homocrystal substitution reaction with gas-phase SiCl4, a significant increase in the strong acidity content of the FAU-type molecular sieve is achieved, while increasing the silicon-aluminum ratio and retaining high crystallinity.

Benefits of technology

The strong acid content of FAU-type molecular sieve has been significantly improved, the silicon-aluminum ratio has been greatly improved, the crystallinity remains above 80%, and multiple ammonium ion exchanges and hydrothermal treatments have been avoided, which simplifies the production process and reduces costs.

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Abstract

The invention provides a strongly acidic FAU type molecular sieve and a preparation method thereof. The preparation method comprises the following steps: carrying out an isomorphous substitution reaction on an FAU type molecular sieve containing a metal element Zr in a skeleton and gas-phase SiCl4 according to a mass ratio of (0.1-20): 1, and then roasting to obtain the FAU type molecular sieve with the high silica-alumina ratio, the reaction temperature of the isomorphous substitution reaction is 200-600 DEG C; the molar ratio of ZrO2 to Al2O3 in the FAU type molecular sieve of which the skeleton contains the metal element Zr is 0.01-10.0. According to the technical scheme provided by the invention, the strong acid content of the FAU type molecular sieve is greatly increased by performing isomorphous substitution on the FAU type molecular sieve containing the metal element Zr in the framework and the gas-phase SiCl4 and then roasting, and the prepared FAU type molecular sieve also has high crystallinity and high framework silica-alumina ratio.
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