Synthesis of thermally stable SBT and SBS/SBT intergrowth zeolites

Stabilizing large pores Zeolites with very large cages, such as zeolite Y, are rare but extremely useful in processing the large hydrocarbons in petroleum. Lee et al. report a route for preparing thermally stable forms of the large-cage phosphate-based molecular sieves UCSB-6 and UCSB-10 (see the Perspective by Xie). They used mainly sodium and cesium ions as inorganic structure-directing agents, along with an organic molecule, in their charge-density mismatch approach. These zeolites were used as diesel-cracking catalysts at 600°C. Science , abi7208, this issue p. 104 ; see also abj1834, p. 28