
434 Green Chemical Engineering
(d)the 6-ring, single or double; (e) the hexagonal sheet with handles; (f) the heulandite
unit. These complex units are mostly simply connected to form the actual frameworks,
but in some cases vertices, edges or also faces shared with nearby units.
Zeolite pores consist of 6-, 8-, 10-, 12- and 14-membered oxygen ring systems to form
tube-like structures and pores that are interconnected to each other. However, other fac-
tors such as the location, size and coordination of the extra-framework cations are also
inuencing pore size.
6.2.1.1 Properties of Zeolites
Dehydration of Zeolites: Most zeolites can be dehydrated ...