Pt-Sn alloy nanoparticles supported on inert SiO₂ were prepared and used in the dehydrogenation of propane. The bulk/surface properties of Pt-Sn alloys during reactions and regeneration reactions and regenerations were investigated by transmission electron microscopy, X-ray diffraction, X-ray absorption fine structure, and X-ray photoelectron spectroscopy. Thermogravimetric analysis showed that small amounts of coke formed on the reacted catalysts, and the Pt-Sn interactions were also weakened during the reaction. Sn enrichment occurred on the catalyst surface after the first and second reaction cycles. Fortunately, a small amount of co-fed H₂ inhibited Sn segregation from Pt-Sn alloys and retained the active structure. The regeneration processes, especially the “oxidation-reduction” method, strengthened Pt-Sn interactions while concurrently burning off coke, allowing partial recovery of the catalytic performance. This work indicates the key role of the special geometric arrangements of Pt-Sn alloys in the dehydrogenation of propane.

制备了负载在惰性SiO ₂上的Pt-Sn合金纳米颗粒，并将其用于丙烷的脱氢反应。通过透射电子显微镜，X射线衍射，X射线吸收精细结构和X射线光电子能谱研究了Pt-Sn合金在反应，再生反应和再生过程中的体积/表面性能。热重分析表明，反应过程中在反应的催化剂上形成少量焦炭，Pt-Sn相互作用也减弱。在第一和第二反应循环之后，在催化剂表面上发生锡富集。幸运的是，少量的H ₂抑制了锡从Pt-Sn合金中的偏析，并保留了活性结构。再生过程，特别是“氧化还原”方法，增强了Pt-Sn相互作用，同时燃烧了焦炭，从而部分恢复了催化性能。这项工作表明了Pt-Sn合金特殊几何排列在丙烷脱氢中的关键作用。