The role of mixed alkali metal cations on the formation of nanosized CHA zeolite from colloidal precursor suspension

A clear understanding of the crystal formation pathways zeolites remains one most challenging issues to date. Here we investigate synthesis nanosized chabazite (CHA) using organic template-free colloidal suspensions by varying time aging at room temperature and hydrothermal treatment 90 °C. The role mixed alkali metal cations (Na + , K Cs ) on CHA in was studied. Increasing precursor suspension from 4 17 days resulted faster crystallization nanocrystals (3 h instead 7 °C) afford significantly smaller particles (60 nm vs 600 nm). During a considerable change content inorganic recovered solid material observed coincide with nanocrystals. Na were found direct condensed pre-shaped aluminosilicate suspensions, while facilitated secondary building units (SBUs) type framework structure such as d6r cha cages, promoted long-range crystalline order facilitating stable zeolite