T. Ohsuna et al., DEALUMINATION OF HEXAGONAL (EMT) CUBIC (FAU) ZEOLITE INTERGROWTH MATERIALS - A SEM AND HRTEM STUDY, Chemistry of materials, 6(12), 1994, pp. 2201-2204
SEM and HRTEM have shown that dealumination with ammonium hexafluorosi
licate of the EMT and FAU end members leads to defect-free materials w
hich have an amorphous layer covering the crystals. In contrast, the d
ealumination of EMT/FAU intergrowths yields materials with crevices wh
ich penetrate deep into the crystals. It is postulated that these occu
r in a highly intergrown region of the crystals. This is the first obs
ervation of the detailed effects of dealumination.