N,N,N,N ',N ',N '-HEXAMETHYLPENTANEDIAMMONIUM-MWW LAYERED PRECURSOR: A REACTION INTERMEDIATE IN THE SYNTHESIS OF ZEOLITES TNU-9 AND EU-1

Abstract

It is found that the layered precursor of a medium-pore zeolite MCM-22, frequently referred as MCM-22(P), which was initially formed in the presence of a flexible, linear diquaternary cation, N,N,N,N',N',N'-hexamethylpentanediammonium (Met(6)-diquat-5), and Na+ is a reaction intermediate in the synthesis of another two medium-pore zeolites TNU-9 and EU-1. The overall results of this study reveal that the crystallization of the latter two zeolites under hydrothermal conditions at the expense of the Me-6-diquat-5/MCM-22(P) composite material depends not only on the concentration of alkali metal cations in synthesis mixtures, but also on their type. (C) 2009 Elsevier Inc. All rights reserved.