Nowadays, the pillaring of clays is a well established technique in the
preparation of new porous solids. It is an easy and controllable way to introduce
porosity in a rather inexpensive substrate. A variety of pillaring species is available,
all with specific sizes and compositions. In this way, it is possible to prepare PILCs
with different interlayer free spacings which determine the pore size. The interpillar
distance can be tuned by varying the charge of both host and pillars.