An Aluminosilicate Zeolite Containing Rings of Tetrahedral Atoms with All Odd Numbers from Five to Eleven

Herein we report the synthesis, structure solution, and catalytic properties of PST-31, which has an unprecedented framework topology. This high-silica (Si/Al=16) zeolite was synthesized using a pyrazolium-based dication with tetramethylene linker as organic structure-directing agent (OSDA) in hydroxide media. The PST-31 is built from new building layers containing four-, five-, six-, seven-membered rings, are connected by single four-membered rings interlayer region to form two-dimensional pore system. Its channels consist [4.56.6.9.11] [5.6.7.9.10.11] cavities thus delimited nine-, ten-, eleven-membered rings. OSDA cations as-synthesized were determined reside without disorder large [42.514.64.72.94] composed smaller ones, leading symmetry coincidence between surrounding cavity. proton found be selective for cracking n-hexane light olefins.