Abstract: Crystalline MoO_3 and supports NaY, mordenite are mixed thoroughly, and the mixtures are calcined at 450 ℃ for 24 hours. A series of zeolites with dispersed MoO_3 are studied by XRD, Laser Raman, IR spectroscopy and surface area measurements. It is shown that duriag the calcination MoO_3 interacts strongly with NaY and mordenite. As a result of this sarface interaction MoO_3 migrates into the cavities of zeolites and disperses on it's surface as a non-crystalline layer. Moreover, the framework of NaY is destroyed by the dispersed MoO_3, but there are less effects on the mordenite's structure because of it's higher stability.
By XRD method, we estimate the maximum amount of dispersed MoO_3 is 0.54 and 0.11 gram per gram of NaY and mordenite respectively.