Controlling metal nanoparticle size and preserving metal dispersion at elevated temperature remain key challenges in designing new supported metal catalysts. Many methods have been proposed to stabilize metal nanoparticles for catalysis, but the use of specialized equipment or metal precursors can limit the application of these methods for scalable production. Here, we demonstrate a synthesis strategy to improve the dispersion and thermal stability of Pt nanoparticles on an oxide support. A thin SiO₂ coat (<2 nm) was deposited on TiO₂ through repeated condensation cycles of tetraethyl orthosilicate (TEOS) with or without an organic template on the surface. H₂PtCl₆ was deposited using wetness impregnation, and the samples were dried, calcined, and reduced. The as-synthesized Pt nanoparticles are 1–2 nm by TEM and maintain dispersion >45% by CO chemisorption even after prolonged heating at 500 °C, whereas Pt nanoparticles on unmodified TiO₂ are less dispersed (∼33%) and their dispersion falls further upon prolonged heating. Ethylene hydrogenation demonstrates that the Pt nanoparticles on modified TiO₂ preserve the catalytic activities of Pt on unmodified TiO₂. The use of wet chemistry-based oxide modification and wetness impregnation makes this strategy a scalable and generalizable synthesis method to prepare other supported metal nanoparticles for catalysis applications.

在设计新型的负载型金属催化剂时，控制金属纳米粒子的尺寸并在高温下保持金属分散仍然是关键的挑战。已经提出了许多方法来稳定用于催化的金属纳米颗粒，但是使用专用设备或金属前体会限制这些方法在可扩展生产中的应用。在这里，我们展示了一种合成策略，可以改善Pt纳米粒子在氧化物载体上的分散性和热稳定性。通过原硅酸四乙酯（TEOS）的重复冷凝循环，在表面上有或没有有机模板的情况下，在TiO ₂上沉积一层薄的SiO ₂涂层（<2 nm）。H _2的PtCl ₆用湿法浸渍沉积沉淀，然后将样品干燥，煅烧和还原。合成后的Pt纳米颗粒在TEM下为1-2 nm，即使在500°C下长时间加热后，通过CO化学吸附仍可保持分散度> 45％，而未改性TiO ₂上的Pt纳米颗粒分散性较低（〜33％），其分散性下降长时间加热。乙烯加氢表明，改性二氧化钛的铂纳米粒子₂保持在未修改的二氧化钛铂的催化活性₂。基于湿化学的氧化物改性和湿法浸渍的使用使该策略成为可扩展且可推广的合成方法，以制备用于催化应用的其他负载型金属纳米颗粒。