Sn additives can effectively improve the propylene selectivity of propane dehydrogenated Pt?based catalysts and inhibit the generation of carbon deposition,but the effect of Sn additives is still unclear.Therefore,in this paper,different PtSn action systems were constructed by co?impregnation method and sol?gel method to modulate the introduction of PtSn,and the effect of Sn introduction methods on the dehydrogenation performance of propane of Pt?based catalysts was systematically explored.XRD and BET were used to characterize the texture properties of the catalyst,H₂?TPR,TEM and CO?IR were used to distinguish the Sn structure of the additives,and the propane dehydrogenation reaction evaluation and carbon deposition analysis of the catalysts were carried out.The results show that compared with the PtSn/γ?Al₂O₃ catalyst prepared by co?impregnation method,the Pt/Sn?γ?Al₂O₃ catalyst prepared by sol?gel method has a lower specific surface area and higher pore size,which can promote the interaction between PtSn clusters and carriers to achieve high metal dispersion.More active sites give the Pt/Sn?γ?Al₂O₃ catalyst higher propane conversion and propylene yield,and the larger pore size of the carrier also significantly reduces the carbon deposition of the catalyst.