This amount is closely related with the content of the iron
species in the iron-pillared clays. The highest BET specific surface area and the largest
porosity of the delaminated iron pillared clays are 215.7 m2/g and 0.29 ml/g, respectively.
Mesopores in the delaminated structure make the main contribution to the total surface area
and porosity, and most of them are preserved after calcination at 773 K. These fundamental
results are of importance in developing novel heterogeneous catalysts and adsorbents.