GUEST HOST RELATIONSHIPS IN THE SYNTHESIS OF LARGE PORE ZEOLITE SSZ-26 FROM A PROPELLANE QUATERNARY AMMONIUM COMPOUND

Quaternary ammonium compounds based upon propellane ring systems [n.3.3.0] were prepared for use as guest molecules in molecular sieve synthesis. The objective was to create microporous systems with intersecting pores greater than 7 angstrom. Using 8,11-diquaternary ammonium derivatives of the [4.3.3.0]propellane, a new crystalline phase was obtained, an aluminosilicate, SSZ-26. Two distinct isomeric organic salts were successful. Template I (one of the isomers) crystallized from acetonitrile/H2O in the orthorhombic space group P2(1)2(1)2(1) with a = 9.573 (6) angstrom, b = 13.875 (7) angstrom, c = 16.912 (9) angstrom (at 130 K), and Z = 4. Template III crystallized from H2O in the monoclinic space group P2(1)/n with a = 14.681 (4) angstrom, b = 12.172 (6) angstrom, c = 14.613 (4) angstrom, beta = 103.79 (2) angstrom (at 130 K), and Z = 4. The zeolite product SSZ-26 was characterized by microporosity measurements and catalytic cracking. All data are consistent with a material with pores > 7 angstrom and a multidimensional channel system.