Structural refinement of the different forms of MWW(P), the sandwich-layered (alumino)silicate precursor of zeolite MCM-22 and ITQ-2 delamin

The aim of this experiment is the study of the structure of MWW(P), an interrupted-network zeolite-like material formed by sandwich-like organic-templated hydrogen-bonded (alumino)silicate layers. High resolution x-ray powder diffraction (XRPD) data coupled with 29Si MAS-NMR are required to allow i) the determination of the structure and selective defect distribution of MWW(P), ii) monitoring the variability of the material with composition (experimented from Si/Al 12 to infinity) and the nature of the organic structure directing agent (SDA). Indeed all of them are factors affecting the formation of industrially relevant catalytic materials from the MWW(P) precursor.