04-O-04-Influence of the nature of T atoms on the morphology and crystal size of KZ-2 and ZSM-22 zeolites isomorphouslys substituted with Al or Fe

Publisher Summary This chapter discusses the influence of the nature of T atoms on the morphology and crystal size of KZ-2 and ZSM-22 zeolites isomorphously substituted with aluminum (Al) or iron (Fe). Syntheses of KZ-2 and ZSM-22 zeolites isomorphously substituted with iron or aluminum are carried out for a wide range of the Si/T ratio (T=A1, Fe). Effect of the gel composition on the size and morphology of the crystals formed is also studied. Using diethylamine as a template, it is possible to synthesize iron-containing KZ-2 zeolites with the similar crystals (in size and morphology) independently of Si/Fe ratio in gel. No such effect is observed when the syntheses are carried out in the presence of aluminum in the gel. The results point to an important role of the nature of T cations in the process of the zeolite crystal growth.