ABSTRACT
This chapter focuses on important research areas that have potential for industrial use, such as the preparation of long-term acid-stable zeolite membranes for practical dehydration. The formation of the zeolite membranes is confirmed by using X-ray diffraction. The surface morphology of the membranes is observed by field emission scanning electron microscopy. LTA membranes show very high Zeolite membranes for pervaporation and vapor permeation performance for water and organic mixtures even for a water and MeOH mixture. However, a major drawback of LTA membranes is their acid-sensitivity. Therefore, a chemically inert and acid-stable membrane for dehydration of acidic mixtures is of great interest. ZSM-5 membrane, in particular the aluminum rich ZSM-5 membrane, has excellent ion-exchange capability, catalytic activity, hydrophilicity and acid-stability, which have attracted much. However, an expensive organic structure-directing agent, such as tetra-n-propylammonium bromide or tetra-n-propylammonium hydroxide, is necessary to prepare the ZSM-5 membrane.
