The development of efficient and economical synthesis
methods for
CON-type aluminoborosilicate zeolite, a promising catalyst for methanol-to-olefins
reactions, is in high demand. Herein, we propose the dual use of organic
structure-directing agents that have different roles in the formation
of CON-type zeolite. Although N,N,N-trimethyl-(−)-cis-myrtanylammonium
hydroxide (TMMAOH) has a strong structure-directing effect on the
formation of CON-type zeolite, it is considerably expensive. Conversely,
the relatively inexpensive tetraethylammonium hydroxide (TEAOH) has
a weak structure-directing effect on the formation of CON-type zeolite
and/or even directs the formation of other impurity phases. The intermediate
addition method of TEAOH, developed herein, could control these competitive
structure-directing effects and enhance the crystallization of CON-type
zeolite from economically viable raw materials. The timing of intermediate
TEAOH addition was found to be a critical factor to obtain a pure
CON phase, and TEA+ was occluded in the final product,
suggesting the pore filler role of TEAOH, while TMMAOH is required
in the early stage of crystallization.
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