Composites of micro- and mesoporous materials: simultaneous syntheses of MFI/MCM-41 like phases by a mixed template approach

In situ formation of the micro- and mesoporous structures MFI and MCM-41 wa s obtained using a two-template syntheses gel system [C6H13(CH3)(3)NBr and C14H29(CH3)(3)NBr]. The mixed phases were obtained by optimizing template c oncentrations and reaction temperatures. Constant temperature syntheses as well as sequential high/low or low/high temperature strategies were perform ed successfully. It was found that the relative amounts of the two structur es MFI and MCM-41 in the final products can be controlled by varying the ra tio of the templates and by tuning the synthesis temperature. Characterizat ion results indicate that phases of varying complexity were obtained. (C) 1 999 Elsevier Science B.V. All rights reserved.