ESI-MS studies of exchange mechansim in zeolite precursor molecules: Substitution of silicon against germanium or gallium

摘要

Microporous zeolitic materials and metal doped zeolitic materials are widely used in applications like catalysis, chemical separations and adsorbents. Their reactivity depends on their pore dimensions and topology on the one hand, on included reactive centres on the other hand. To establish tailored, rationally controlled syntheses leading to zeolitic materials with defined properties is one of the great challenges in zeolite science. Unfortunately still little is known about the fundamental steps during solid state formation in general. This is mostly due to the size of occurring species during the pre-nucleation and nucleation, which lies between molecules and the extended solid. Thus, only a few methods are available to catch the nucleation spot and to analyze the pre-nuclei and nuclei cluster on which the zeolite properties are based on.