ABSTRACT
Various improvements have broadened the research in the field of zeolite membranes and films, such as the development of new synthesis procedures, the use of new supports with specific characteristics (monoliths, foams, etc.) or the use of modified supports by means of masking or grafting techniques, the application of new analytical techniques (isotopic-transient experiments, permporometry, etc.), the control of the orientation of the crystals (by means of covalent linkages, synthesis conditions, etc.) and of the thickness of the membranes, and the preparation of new zeolites as membranes or new zeolite related-materials. In addition, a variety of zeolites can now be prepared as colloidal systems with particle dimensions ranging from tens to a few hundred nanometers.
