沸石分子筛催化剂的“限域”效应

沸石分子筛催化剂因其独特的酸性、规则的孔道结构和良好的水热及化学稳定性被广泛应用于石油化工、煤化工和精细化工等重要领域.沸石分子筛活性位点的数目和分布,以及孔结构效应是沸石分子筛催化科学研究中最根本的问题,直接影响催化反应历程和反应结果.几十年来,沸石分子筛催化研究多集中在对活性位点的基本认识和合成设计,而忽视了活性位...

Confinement effect in zeolite catalysts

Owing to its unique acid property, uniform pore structure and good hydrothermal and chemical stability,zeolite has been widely used in petrochemical, coal chemical and fine chemical industries. Acid activity and pore structure are common factors used to characterize the behavior of the zeolite catalysts. For decades, research effort has been mostly made to the basic understanding and rational design of acid active sites of zeolite, while the interaction between active sites, reactive molecules, and the pore micro-environment was ignored. Benefiting from the development of advanced chemical analysis technology and chemical theoretical calculation science, the study of the microenvironment in the pores of zeolite catalysts has attracted more and more attention. In this paper, the development of zeolite confinement effect theory, its influence on the molecule diffusion, adsorption and reaction, and its new applications are briefly overviewed.