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Facile Preparation of Aluminosilicate RTH across a Wide Composition Range Using a New Organic Structure-Directing Agent
journal contribution
posted on 2014-12-23, 00:00 authored by Joel E. Schmidt, Mark A. Deimund, Mark E. DavisRTH type zeolite (aluminosilicate)
is a potentially useful catalytic
material that is limited by the inability to easily prepare the material
over a wide composition range. Here, we report the use of pentamethylimidazolium
to prepare aluminosilicate RTH across a wide range of compositions
in both fluoride and hydroxide inorganic systems. RTH type zeolites
are crystallized with a calcined product Si/Al of 7–27 from
fluoride media and 6–59 from hydroxide media. The use of this
new, simple organic structure-directing agent that can be prepared
in one step allows for dramatic improvement in the compositional space
where aluminosilicate RTH can be formed. RTH is tested as a catalyst
for the methanol-to-olefins reaction and at complete conversion shows
a high propylene/ethylene ratio of 3.9 at a propylene selectivity
of 43%.