Timetable selectors

These seven factors which determine the time required for crystallization can be divided into timetable selectors and species selectors. Rate of addition, anion activation, source of Si02 and reaction temperature can all be considered "timetable selectors". 

In summary, the particular zeolite species or mixture of species which crystallizes can be controlled and is predictable within the synthesis conditions studied. This control can be achieved by applying the concept of a continuum between the species HS-A-X-Y, utilizing the timetable selectors to establish a fixed frame of reference, and using the species selectors to selectively produce a desired zeolite. Once the desired species has crystallized, it is then possible to regulate and predict its conversion to the species which precedes it in the continuum. 

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