Molybdenum-containing zeolite catalysts are effective bifunctional catalysts inpetrochemical industry. It is difficult to exchange the cations of zeolitc for molybdenumions directly because high valence cationic molybdenum can only exist in very acidic solu-tion where ion exchange equilibria are unfavorable. In order to overcome the difficulties ofaqueous ion exchange, many other methods were reported for the preparation of MoY It is difficult to exchange the cations of zeolitc for molybdenum investments directly because high valence cationic molybdenum can only exist in very acidic solu- tion where ion exchange equilibria are unfavorable. In order to overcome the difficulties of aqueous ion exchange, many other methods were reported for the preparation of MoY