In order to solve the deactivation problem of traditional PtSn catalysts caused by the unstable structure during propane dehydrogenation(PDH),Ir@SnOx-S,an efficient catalyst with a surface covered by SnOx,is designed via in-situ transition method.Compared with IrSn-S catalyst prepared via impregnation method,the prepared Ir@SnOx-S catalyst can increase the conversion rate of propane by 52.8％and deliver a 97％of propylene selectivity,while maintaining a highly stable catalytic performance in continuous cycle tests.The structures of these two catalysts are analyzed by means of XRD,XPS,TEM and in-situ infrared.It is indicated that the SnOx species enriched layer is formed on the surface of Ir@SnOx-S.Strong electronic interaction takes place between SnOx species and Ir,which induces the formation of highly active surface Irδ+species for Ir@SnOx-S catalyst,further increasing the conversion frequency of propane activation.
关键词
丙烷脱氢/双金属催化剂/合成/稳定性/构效关系
Key words
propane dehydrogenation/bimetallic catalyst/synthesis/stability/relationship between structure and performance
维普
万方数据