为解决传统PtSn催化剂在丙烷脱氢（PDH）中结构不稳定导致的失活问题，通过原位转变法设计了一种表面富集SnO_x的高效丙烷脱氢催化剂Ir@SnO_x-S。结果表明，与浸渍法制备的IrSn-S相比，Ir@SnO_x-S催化剂丙烷转化率增加52.8%，同时表现出97%的丙烯选择性，在连续的循环测试中保持了高度稳定的催化性能。通过XRD、XPS、TEM和原位红外等表征手段对2种催化剂进行结构分析发现，在Ir@SnO_x-S催化剂表面生成了SnO_x富集层，该物种与Ir之间产生强烈的电子交互作用，诱导生成高活性的表面Ir^δ+物种，进而提升了丙烷活化的转化频率。

In order to solve the deactivation problem of traditional PtSn catalysts caused by the unstable structure during propane dehydrogenation (PDH), Ir@SnO_x-S, an efficient catalyst with a surface covered by SnO_x, is designed via in-situ transition method.Compared with IrSn-S catalyst prepared via impregnation method, the prepared Ir@SnO_x-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 SnO_x species enriched layer is formed on the surface of Ir@SnO_x-S.Strong electronic interaction takes place between SnO_x species and Ir, which induces the formation of highly active surface Ir^δ+ species for Ir@SnO_x-S catalyst, further increasing the conversion frequency of propane activation.

王明山(1995-),男,硕士生,研究方向为脱氢催化剂,1324461552@qq.com