Silicon-rich mordenite surface and method for its preparation and use
By synthesizing surface-rich silica mordenite through in-situ two-step crystallization, the problems of low conversion efficiency and easy carbon deposition and deactivation of molecular sieves for inferior aromatic feedstocks are solved, achieving high-efficiency aromatic conversion and stability, and is particularly suitable for the aromatic conversion to increase BTX production reaction.
CN117917379BActive Publication Date: 2026-07-24CHINA PETROLEUM & CHEMICAL CORP +1
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Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHINA PETROLEUM & CHEMICAL CORP
- Filing Date
- 2022-10-20
- Publication Date
- 2026-07-24
AI Technical Summary
Technical Problem
Existing molecular sieves suffer from low conversion efficiency for inferior aromatic feedstocks and are prone to carbon buildup and deactivation.
Method used
Surface-rich silica-rich mordenite was synthesized by an in-situ two-step crystallization method, generating a silica-rich outer surface layer structure that inhibits macromolecular carbon deposition and pore blockage, and promotes small molecule diffusion and transformation.
Benefits of technology
It improves the activity and stability of aromatic hydrocarbon conversion reactions, and is particularly suitable for increasing BTX production. It also inhibits macromolecular adsorption and pore blockage, thereby improving conversion efficiency.
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Figure CN117917379B_ABST
Abstract
The present application relates to the field of molecular sieve preparation, and discloses a surface silicon-rich mordenite, a preparation method and application thereof, wherein the surface Si / Al molar ratio of the mordenite is 10-80, the bulk Si / Al molar ratio is 3-25, and the ratio of the surface Si / Al molar ratio to the bulk Si / Al molar ratio is above 1.2. In the preparation method of the mordenite, a first gel is crystallized to generate mordenite with a low Si / Al ratio, and after the first crystallization is completed, a second gel with a high Si / Al ratio is added and subjected to a second crystallization process, so that the nucleation and growth of the second gel are inhibited, the second gel is quickly dissolved, and an epitaxial growth of the second gel on the outer surface of the first crystallization product is promoted, thereby generating a surface layer structure rich in silicon. The molecular sieve provided by the present application can inhibit the adsorption of macromolecular components or carbon deposition precursors on the surface layer, and promote the diffusion and conversion of small molecule raw materials.
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