Synthesis of thermally stable SBT and SBS/SBT intergrowth zeolites

• DOI: 10.1126/science.abi7208
• Publication Date: 2021-07-01T19:08:34Z
• Authors: Hwajun Lee; Jiho Shin; Kyounghwan Lee; Hyun June Choi; Alvaro Mayoral; Na Young Kang; Suk Bong Hong
• Keywords: PRECURSORS; FRAMEWORKS; 01 natural sciences; 0104 chemical sciences

UCSB-6 (framework type SBS) and UCSB-10 (SBT), two three-dimensional phosphate-based molecular sieves with supercages accessible through 12-ring (circumscribed by 12 tetrahedral atoms) windows, are structurally similar to the hexagonal cubic polytypes of faujasite or zeolite Y, an industrially relevant catalyst, but cage structures substantially different. Nonetheless, their inherent thermal instability has precluded any catalytic application so far. By using multiple inorganic cation charge density mismatch approaches, we synthesized PST-32 PST-2, a thermally stable aluminosilicate version hypothetical SBS/SBT intergrowth family member, respectively. This study suggests that many cage-based multidimensional channel systems can be as compositionally robust forms systematically exploring synergy effect organic structure-directing agents.