SYNTHESIS OF ZSM-5 CRYSTALS WITH IMPROVED MORPHOLOGY

摘要

FIELD: physics.;SUBSTANCE: synthesis is carried out from the reaction mixtures suitable for the crystal synthesis of ZSM-12 framing structure in the absence of the seed crystals of ZSM-5 framing structure, including the absence of any seed crystals. In case of the synthesis mixtures with the sufficiently high ratio of XO₂:Y₂O₃, the introduction of ZSM-5 seed crystals into the synthesis mixture can lead to the pure phase of ZSM-5 crystals with the new morphology. This morphology may include spiky primary crystallites of approximately 0.5 microns or less, which are ordered/aggregated into larger secondary crystalline structures.;EFFECT: primary crystallites aggregating into the secondary crystalline structure provides a large surface area of ZSM-5 crystals mesopores.;17 cl, 12 dwg, 14 tbl, 12 ex