Framework induced basicity in zeolites
作者： D Barthomeuf
DOI: 10.1016/J.MICROMESO.2003.08.006
关键词: Crystal structure 、 Faujasite 、 Atom 、 Crystallography 、 Mole fraction 、 Cluster (physics) 、 Chemistry 、 Ferrierite 、 Inorganic chemistry 、 Inductive effect 、 Bond length
摘要: Abstract The basicity of oxygens zeolites (intrinsic basicity) is considered to derive from specific Al location in the T sites. Basicity clusters are defined as topological domains around a central atom and limited by second (strong or third (medium weak layers TO 4 tetrahedra. framework topology directs number neighbours. This determines given several opportunities for strength amount sites depending on which site occupied Al. A bond distance suggested characterize closeness atoms framework. detailed case faujasite where layer may be singly doubly bonded generating stronger than ferrierite all these bonded. As density becomes higher, with lower degree connectivities between atoms, trends are, fixed molar fraction (or Si/Al) increase basic and/or, located cluster decrease mean strength. calculated clusters. Its order FAU
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