A modification method of all-silicon beta molecular sieve containing three-membered ring

A technology of molecular sieves and three-membered rings, applied in molecular sieve catalysts, chemical instruments and methods, organic chemistry, etc., can solve the problems of harsh synthesis conditions, non-green synthesis process, unfavorable environmental protection, etc., and achieve simple and feasible process and regular structure Effect
CN113371729BActive Publication Date: 2022-01-04CHINA UNIV OF MINING & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA UNIV OF MINING & TECH
Publication Date
2022-01-04

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Abstract

The invention provides a method for modifying an all-silicon Beta molecular sieve containing a three-membered ring and a Lewis acid, belonging to the field of petrochemical industry. Firstly, the Beta molecular sieve with a Si / Al ratio higher than 10 is used as the raw powder, and then it is completely dealuminated by a nitric acid solution, and then deionized water is used to balance the acid-base of the dealuminated thick Beta molecular sieve to obtain a full-silicon The Beta molecular sieve is then dried, and then put into a muffle furnace for roasting to obtain an all-silicon Beta molecular sieve containing a three-membered ring and a Lewis acid. This method avoids the use of fluorine-containing mineralizers in in-situ synthesis, and is environmentally friendly; the obtained all-silicon Si-Beta molecular sieve contains a three-membered ring structure and effective Lewis acid sites, and can be used for the isomerization of olefins. The steps are simple, the preparation is quick and environmentally friendly.
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Description

technical field

[0001] The invention relates to a method for modifying a three-membered ring-containing all-silicon Beta molecular sieve, which belongs to the field of petrochemical industry. Background technique

[0002] Molecular sieves are widely used in the petrochemical industry due to their adjustable acid properties and unique pore structure. The acid properties of molecular sieves essentially determine the application and catalytic performance of molecular sieves. The acidic modulation of molecular sieves is difficult to control, and it is difficult to obtain molecular sieves with only Lewis acid. The Lewis acid in molecular sieves is mainly derived from non-framework aluminum species, and it is impossible to only exist in non-framework aluminum species in molecular sieves, generally there will be both framework aluminum and non-framework aluminum species, so in general molecular sieves there will be both acid and Lewis acid. Molecular sieves exist only Acids or...

Claims

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