DEPOSITION OF CONTINUOUS SILICALITE-1 FILMS ON INORGANIC FIBERS

Silicalite-fiber composites were prepared by a new method for the synt hesis of molecular sieve films. The method consists of two steps: in t he first one, the surface charge of the support is reversed by treatme nt with a cationic polymer solution and a monolayer of negatively char ged colloidal molecular sieve seed crystals is adsorbed on the surface . The second step consists of hydrothermal treatment of the support in a molecular sieve precursor solution resulting in the formation of a continuous film of molecular sieve. The method was applied to carbon, ZrO2, Al2O3, mullite, ceramic and pyrex glass fibers. The crystallizat ion of continuous silicalite-l films on all types of fibers was confir med by SEM, XRD, FTIR, DTA analyses and BET surface area measurements.