A new structure-directing agent for the synthesis of pure-phase ZSM-11

A new synthetic procedure for the preparation of pure-phase ZSM-11 (MEL) is reported. Pure-phase ZSM-11 is synthesized at 135 degreesC using 2,2-dieth oxyethyltrimethylammonium as a structure-directing agent (SDA). The effects of the incorporation of boron in the reaction chemistry are also reported. A very high SDA-ZSM-11 specificity is observed since the inclusion of ZSM- 5 (MF1) into the synthesis mixture at levels as high as 24 wt.% of the tota l silica content still leads to the crystallization of ZSM-11. (C) 2001 Els evier Science B.V. All rights reserved.