Searching for new high silica zeolites through a synergy of organic templates and novel inorganic conditions

The synergy of template molecule size and hydrophobicity and the sources of inorganic reagents affecting zeolite nucleation are described. In particular, the discovery of high silica zeolites SSZ-26, 41, 42 and UTD-1 is considered in this light. Of particular value is the use of zeolites themselves as reactants; three different examples are given. Some general rules for lattice substitution and zeolite product type are given. An unexpected use of the template used in the discovery of zeolite SSZ-42 is described now that the structure of the zeolite has been resolved, largely from single crystal data. Finally some new synthetic conditions with considerable economic advantage are described for zeolite SSZ-25. Some new questions about the effect of organic cations on solution instability are raised.