RESEARCH PROGRESS OF MOLECULAR SIEVE SKELETON ALUMINUM ATOM DISTRIBUTION

Abstract

Abstract: Molecular sieves have been widely used in acid-catalyzed reactions of petrochemical industrybecause of their variable acidic sites, good shape selectivity and hydrothermal stability. The distribution of acid sites is determined bythe position of aluminum atom in the molecular sieve framework, therefore, the distribution of skeleton aluminum atoms (including the porevolume, chemical environment of skeleton aluminum location, the distance between two aluminum atoms) has a great influence on its acidcatalytic performance (reaction pathway or reaction rate). Becausethe synthesis ofmolecular sieveinvolves a complex crystallization process,there are many factors affectingthe distribution of skeleton aluminum atoms, such as the kind and concentration of starting materials, crystallization conditions, introduction of heteroatoms, and post-treatment methods, etc. Many researchers have done a lot of research on regulation ofskeletonaluminum atoms. Based on this,the related research resultswere reviewed in order to promote theoriented synthesis of specific aluminum atom-distributed molecular sieves.

Key words: molecular sieve, skeleton aluminum atom, acid site, crystallization, oriented synthesis

References

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