The classic strong metal-support interaction (SMSI), characterized by the encapsulation of metal nanoparticles within suboxide layers, is a promising strategy for designing robust catalysts. However, applying this strategy to the high-temperature propane dehydrogenation (PDH) process, which is an important petrochemical process for the industrial production of propylene, is rarely reported. Herein, we demonstrate an SMSI-type PDH catalyst, composed of subnanometric Pt₂In₃ clusters encapsulated by an In₂O_3-x overlayer, exhibiting high stability and selectivity. During a 160-h on-stream test, it showed a slight activity decline (k_d = 0.002 h⁻¹) and maintained 99.5% propylene selectivity. The excellent performance is attributed to the dual role of the In₂O_3-x overlayer, which not only prevents the sintering of the Pt₂In₃ clusters but also modifies the electronic structure of Pt atoms via interfacial interaction, thus facilitating the generation and propylene desorption. Meanwhile, the Pt₂In₃ intermetallics disrupt large Pt ensembles and introduce electron-rich Pt atoms, suppressing side reactions and enhancing propylene desorption.

中文翻译：

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通过经典的强金属-载体相互作用，促进丙烷脱氢，而不是 Pt-In 金属间化合物


经典的强金属-载体相互作用 （SMSI） 的特点是将金属纳米颗粒封装在亚氧化物层内，是设计稳健催化剂的一种很有前途的策略。然而，将这种策略应用于高温丙烷脱氢 （PDH） 工艺，这是丙烯工业生产的重要石化工艺，很少见报道。在此，我们展示了一种 SMSI 型 PDH 催化剂，它由由 In ₂ O _3-x 外层封装的亚纳米 Pt ₂ In ₃ 簇组成，表现出高稳定性和选择性。在 160 小时的在线测试中，它显示出轻微的活性下降 （k _d = 0.002 h ⁻¹ ） 并保持 99.5% 的丙烯选择性。优异的性能归功于 In ₂ O _3-x 覆层的双重作用，它不仅可以防止 Pt ₂ In ₃ 簇的烧结，还可以通过界面相互作用改变 Pt 原子的电子结构，从而促进丙烯的生成和解吸。同时，Pt ₂ In ₃ 金属间化合物破坏了大的 Pt 系聚体并引入富含电子的 Pt 原子，抑制了副反应并增强了丙烯解吸。