Comparison plots are an effective method for the determination of some
structural properties of adsorbents, supports and catalysts. With res
pect to their very different and often complicated structures, the cho
ice of the reference adsorbent (isotherm) is of fundamental importance
. If a deeper insight into the materials under study is aimed at, the
analysis of adsorption data by this method should be supplemented by a
dditional experimental data or model calculations. AU examples present
ed pertain to modern materials with interesting potential applications
. They represent typical examples for microporous/mesoporous or purely
mesoporous solids.