An in-situ transformation preparation method for Nd-modified ANA molecular sieves and its catalytic application.

CN120987341BActive Publication Date: 2026-05-26INNER MONGOLIA UNIV OF SCI & TECH
View PDF 2 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
INNER MONGOLIA UNIV OF SCI & TECH
Filing Date
2025-10-22
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Traditional ANA molecular sieves suffer from poor acidity tunability and insufficient hydrothermal stability in acid-catalyzed reactions, which limits their catalytic efficiency and lifespan under harsh reaction conditions. Furthermore, traditional homogeneous catalysts such as concentrated sulfuric acid cause equipment corrosion and environmental pollution.

Method used

An in-situ transformation crystallization method for Nd-modified ANA molecular sieves was developed. By introducing neodymium (Nd) into USY molecular sieves and performing hydrothermal crystallization under mild conditions, Nd@ANA molecular sieve catalysts were formed, avoiding the use of expensive organic template agents and enhancing the regulation of acidic sites and structural stability of the molecular sieves.

Benefits of technology

It achieves catalytic performance with high activity, high selectivity and excellent stability, avoids equipment corrosion and environmental pollution, reduces production costs, and is suitable for large-scale industrial production.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure CN120987341B_ABST
    Figure CN120987341B_ABST
Patent Text Reader

Abstract

This invention relates to the fields of chemical engineering and industrial catalysis, and discloses an in-situ crystallization preparation method for Nd-modified ANA molecular sieves, comprising the following steps: S1, ingredient preparation: dissolving an alkali source in deionized water, stirring until fully dissolved, adding USY molecular sieve, and stirring thoroughly to form a gel; then adding a neodymium (Nd)-containing metal source to the gel and continuing to stir and mix evenly; S2, crystallization: placing the mixed gel obtained in step S1 in a reaction vessel for hydrothermal crystallization reaction to generate Nd-modified ANA molecular sieves. This in-situ crystallization preparation method for Nd-modified ANA molecular sieves and its catalytic application precisely control the acidic sites of the ANA molecular sieves through the specific modification of Nd³⁺. Experiments have shown that under various acid catalytic reaction conditions, Nd-modified ANA molecular sieves exhibit significantly higher catalytic activity than unmodified and other rare earth element (such as La, Sm) modified molecular sieves.
Need to check novelty before this filing date? Find Prior Art