Colloidal nanocrystals of zeolite beta stabilized in alumina matrix

Characteristics of zeolite beta in stable aqueous colloidal solution were m easured by cryo- TEM, DLS, SAXS and after separation from solution by SEM, HR-TEM. Twenty-nanometer spherical zeolite crystals were measured in equili brium with flocculates. Mixing of colloidal zeolite solution with aluminoge l yielded coagulation of both materials. The mass of zeolite: adsorbed by a luminogel increased with decreasing pH. After calcination, pellets of the c omposite material at zeolite loading below 60 wt % contained separated nano crystals of 10-15-nm zeolite beta stabilized in the mesopores of alumina ma trix. The imbedded zeolite had high structure order and acidity. No blockin g of the zeolite micropores in composite materials was detected. The activi ty of zeolite beta nanocrystals (imbedded in alumina matrix) in cumene crac king twice that of bulk nanozeolite clusters.