Synthesis of thermally stable SBT and SBS/SBT intergrowth zeolites

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 and cubic polytypes of faujasite or zeolite Y, an industrially relevant catalyst, but the cage structures are substantially different. Nonetheless, their inherent thermal instability has precluded any catalytic application so far. By using multiple inorganic cation and charge density mismatch approaches, we synthesized PST-32 and PST-2, a thermally stable aluminosilicate version of UCSB-10 and the hypothetical SBS/SBT intergrowth family member, respectively. This study suggests that many hypothetical cage-based zeolite structures with multidimensional channel systems can be synthesized as compositionally robust forms by systematically exploring the synergy effect of inorganic and organic structure–directing agents.This work was supported by the National Creative Research Initiative Program (2012R1A3A2048833) through the National Research Foundation of Korea and by a grant from the Korea Research Institute of Chemical Technology (SI2112-10 and SI2161-114. A.M. acknowledges the Spanish Ministry of Science under the Ramon y Cajal Program (RYC2018-024561-I), the Regional Government of Aragon (DGA E13_20R), and the National Natural Science Foundation of China (NFSC-21850410448 and NSFC-21835002).Peer reviewe