Low-Pt-loading propane dehydrogenation catalyst and application thereof

The invention relates to a low-Pt-loading propane dehydrogenation catalyst and application thereof.The catalyst comprises an aluminum oxide carrier, a main active component Pt, a first auxiliary Sn, a second auxiliary and a third auxiliary, the second auxiliary is at least one of IIIA family elements, the third auxiliary is at least one of alkali metal or alkaline earth metal, and the low-Pt-loading propane dehydrogenation catalyst is prepared through the following method that S1, the first auxiliary Sn is added to the main active component Pt, and the third auxiliary Sn is added to the main active component Pt; pretreating the alumina carrier under a vacuum condition; s2, dipping the pretreated alumina carrier into a dipping solution containing a Pt precursor, a Sn precursor, a second auxiliary agent precursor, a third auxiliary agent precursor and hydrochloric acid; s3, after dipping, drying and roasting to obtain a catalyst precursor; and S4, pre-reducing the catalyst precursor under the condition of H2 to