Preparation of Oxide, Sulfide and Other Chalcogenide Clusters in Molecular Sieves

摘要: In zeolites 50 to 80% of the total volume is available for hosting other organic or inorganic phases, and this free highly structured according crystallographically defined pore system. Small chalcogenide particles can be incorporated into systems molecular sieves either during crystallization process or, in a manner much easier control, by post-synthesis modification aiming at new functionalities. For example, alkali alkaline earth metal oxides have been introduced create catalytically active base sites. The entrapment transition aims formation selective catalysts oxidation ammoxidation reactions, catalytic reduction NOx, photocatalysis. isolated, zeolite-anchored oxidic species, which are often less easily reduced than bulk oxides, desired favor mild oxidation, i. e., avoid deep even oxidation. Supported oxide clusters nanometer size also studied with respect possible application redox sensor devices, rapid detection low concentrations various gases. regular system zeolite supports expected stabilization dispersed uniform particle and, thus, properties. host charge, its hydrophobicity, relative guest their concentration three-dimensional arrangement, polarity structural properties all adjusted large extent many instances independently from each other.