Catalytic conversion of propane to propylene can be achieved by non-oxidative propane dehydrogenation (PDH) by Pt-based catalysts under 550–700 °C. In this work, we report a strategy to decrease the Pt loading amount to only 0.1 wt% for obtaining a stable catalyst via silica coating for high PDH activity at a temperature as low as of 450 °C. The as-prepared 2.5%Si@PtGa/Al₂O₃ catalyst shows outstanding catalytic activity (propylene productivity rate 0.5 mol/g_cat.·h) close to its equilibrium conversion (24.5%) with much better stability (deactivation constant: 0.007 h⁻¹) at 450 °C. The interface between catalyst and silica coating changes the strong metal-support interaction (SMSI) to immobilize the Ga oxide clusters, further tightly anchoring the Pt catalytic sites for PDH process. Moreover, the electronic state of Pt is also influenced by the silica coating layers. This work demonstrates a new method to harnessing the metal-support interaction in catalysis.

丙烷催化转化为丙烯可以通过铂基催化剂在 550-700°C 下通过非氧化丙烷脱氢 (PDH) 实现。在这项工作中，我们报告了一种将 Pt 负载量降低至仅 0.1 wt% 的策略，以通过二氧化硅涂层获得稳定的催化剂，在低至 450°C 的温度下具有高 PDH 活性。所制备的 2.5%Si@PtGa/Al ₂ O ₃催化剂在接近其平衡转化率 (24.5%) 时表现出出色的催化活性（丙烯生产率 0.5 mol/g _cat. ·h），稳定性更好（失活常数：0.007） h ^-1) 在 450 °C。催化剂和二氧化硅涂层之间的界面改变了强金属-载体相互作用（SMSI）以固定 Ga 氧化物簇，进一步牢固地固定 Pt 催化位点用于 PDH 过程。此外，Pt 的电子态也受二氧化硅涂层的影响。这项工作展示了一种利用催化中金属-载体相互作用的新方法。