CRYSTAL-STRUCTURE OF DEHYDRATED FULLY EXCHANGED LIA ZEOLITE

A good knowledge of the structure of zeolites is required for the unde rstanding of their selective sorption capacities and of their catalyti c properties. In particular, the dimensions of the channels and cages, the positions of the exchangeable cations and their interaction withi n the framework are of great interest. The present study deals with th e accurate crystal structure determination of a fully exchanged and fu lly dehydrated LiA zeolite (Li96Al96Si96O384) by X-ray diffraction on a single crystal. This work shows that the cation exchange distorts th e skeleton, especially around the oxygen linking the AlO4 and SiO4 tet rahedra. (C) Academie des sciences/Elsevier, Paris.