Flexibility of the zeolite RHO framework; relocation of cadmium accompanying transformation of the unit cell at high temperatures

Abstract

Upon heating Cd2+-exchanged zeolite RHO, a relocation of the extra-framework cation accompanies the transformation from the acentric (A) to centric (C) structure type; this relocation from the eight ring to a six ring site, which are 5.7 Å apart, is the largest observed in a zeolite.