Bein, Thomas; Brown, Kelly D.; Enzel, Patricia; Brinker, C. Jeffrey
Formation and characterization of inorganic membranes from zeolite-silica microcomposites.
In: Materials Research Society Symposium Proceedings, Vol. 121: pp. 761-766
Small crystals of zeolites (500-1000 nm) with two- and three-dimensional channel
systems (faujasite and ZSM-5 structures) were embedded in amorphous thin films derived
from TEOS hydrolyzed in alcoholic solution. Scanning electron microscopy studies show that the
zeolites can be quite evenly dispersed in the membrane, resulting in single layers of zeolite
crystals protruding out of the amorphous matrix. In situ FT-IR studies with a series of probe
molecules revealed that in most membranes the zeolites were 100% accessible from the gas
phase. The membranes excluded molecules which are larger than the pore openings of the
zeolite embedded in the composite.