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New Insights in the Formation of Combined Zeolitic/Mesoporous Materials by using a One‐Pot Templating Synthesis
Author(s) -
Vernimmen Jarian,
Meynen Vera,
Herregods Sebastiaan J. F.,
Mertens Myrjam,
Lebedev Oleg I.,
Van Tendeloo Gustaaf,
Cool Pegie
Publication year - 2011
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.201100268
Subject(s) - mesoporous material , zeolite , chemistry , hydroxide , chemical engineering , porosity , bromide , one pot synthesis , template , nanotechnology , catalysis , materials science , inorganic chemistry , organic chemistry , engineering
Zeolitic growth is often absent or occurs in separate phases when synthetic strategies based on the combination of zeolite templates and mesopore templating agents are applied. In this work, zeolitic growth and mesopore formation have been investigated at different temperatures by applying a one‐pot templating approach, based on a TS‐1 zeolite synthesis whereby part of the microtemplate (tetrapropylammonium hydroxide, TPAOH) is replaced by a mesotemplate (hexadecyltrimethylammonium bromide, CTMABr). Moreover, the synthesis duration and the molar ratio of the microtemplate/mesotemplate have also been studied. The different syntheses clearly show the inherent competitive mechanism between zeolitic growth and mesopore formation. These insights have led to the conclusion that by following a one‐pot templating strategy with standard, nonexotic commercial templates, i.e. CTMABr and TPAOH, it is not possible to develop a “true” hierarchical mesoporous zeolite, meaning a mesoporous siliceous material with highly crystalline zeolitic walls. The resultant materials are instead combined zeolitic/mesoporous composite structures with, however, highly tuneable and controllable porosity characteristics.