DIRECT OBSERVATION OF PURE MEL TYPE ZEOLITE

We have obtained the direct evidence by high-resolution electron micro scopy (HREM) that a pure MEL type zeolite has been successfully synthe sized in an all-silica form using a novel organocationic templating ag ent. It has been also confirmed from a synchrotron X-ray powder diffra ction pattern obtained at room temperature that the crystal structure of this all-silica zeolite is of the MEL-type by use of the Rietveld m ethod.