Propane dehydrogenation produced propylene catalyst and preparation method thereof

The invention relates to a propane dehydrogenation produced propylene catalyst. According to the catalyst, a Ta-containing MCM-68 molecular sieve serves as a carrier, Pt serves as a main active component, and Y serves as an auxiliary active component. The content of the Pt in the catalyst is 0.1 to 1.0 weight percent of the total weight of the catalyst, the content of the Y is 0.4 to 4.0 weight percent of the total weight of the catalyst, and the content of the Ta is 0.2 to 5.0 weight percent of the total weight of the catalyst. The invention also relates to a preparation method of the catalyst. The Ta-containing MCM-68 serves as the carrier of the catalyst, and the Pt and the Y serve as the active components; forming of a Pt-Ta alloy can be inhibited under reaction conditions by introducing the Ta in advance; meanwhile, an interaction force between the Pt and the carrier is increased, and the stability performance of catalyst reaction is improved; by introducing the Y, the dispersity of the precious metal Pt on the surface of the carrier and the valence state stability are improved favorably, and an interaction among metal, aids and the carrier is further improved, so that the reaction activity and the propylene selectivity of the catalyst are improved.