Propane dehydrogenation(PDH) has become a globe-welcoming technology to meet the massive demand for propylene, but the most commonly used Pt-based catalysts suffer from quick sintering, poor selectivity for propylene, and unsatisfied Pt utilization. Herein, a series of Silicalite-1(S-1) zeolite-encaged ultrasmall Pt-Zn clusters with a trace amount of Pt[40–180 ppm(parts per million)] were developed by using a one-pot ligand-protected direct H₂ reduction method. Interestingly, the extremely low amount of Pt can significantly promote the activity of zeolite-encaged Zn catalysts in PDH reactions. Thanks to the high Pt dispersion, the synergy between Pt and Zn species, and the confinement effect of zeolites, the optimized PtZn@S-1 catalyst with 180 ppm Pt and 1.88%(mass fraction) Zn, exhibited an extraordinarily high propane conversion(33.9%) and propylene selectivity(99.5%) at 550 °C with a weight hourly space velocity (WHSV) of 8 h⁻¹, affording an extremely high propylene formation rate of \(340.7\,{\rm{mo}}{{\rm{l}}_{{{\rm{C}}_3}{{\rm{H}}_6}}} \cdot {g_{{\rm{Pt}}}}^{ - 1} \cdot {{\rm{h}}^{ - 1}}\). This work provides a reference for the preparation of zeolite-encaged metal catalysts with high activity and noble metal utilization in PDH reactions.

丙烷脱氢（PDH）技术已成为全球欢迎的技术以满足对丙烯的大量需求，但最常用的铂基催化剂存在快速烧结、丙烯选择性差和铂利用率不高等问题。在此，通过使用单锅配体保护直接开发了一系列具有痕量 Pt [40-180 ppm（百万分之一）] 的 Silicalite-1(S-1) 沸石包裹的超小型 Pt-Zn 团簇氢₂还原法。有趣的是，极少量的 Pt 可以显着提高沸石包裹的 Zn 催化剂在 PDH 反应中的活性。由于 Pt 的高分散性、Pt 和 Zn 物种之间的协同作用以及沸石的限域效应，优化后的 PtZn@S-1 催化剂具有 180 ppm Pt 和 1.88%（质量分数）Zn，表现出非常高的丙烷转化率（ 33.9%) 和丙烯选择性 (99.5%) 在 550 °C，重时空速 (WHSV) 为 8 h ⁻¹，提供极高的丙烯形成率\(340.7\,{\rm{mo}}{ {\rm{l}}_{{{\rm{C}}_3}{{\rm{H}}_6}}} \cdot {g_{{\rm{Pt}}}}^{ - 1} \cdot {{\rm{h}}^{ - 1}}\). 该工作为制备在PDH反应中具有高活性和贵金属利用率的沸石包封金属催化剂提供了参考。