Obtaining stable single-atom catalysts (SACs) for high-temperature applications remains challenging due to the thermodynamically favourable metal sintering under harsh reaction conditions. Taking advantage of the high-temperature process conditions (> 1000 °C), we hereby report the preparation of thermally stable metal oxide-supported single-atom Pt catalysts by flame spray pyrolysis. Among the four common supports (Al₂O₃, SiO₂, TiO₂ and ZrO₂) evaluated, single-atom Pt species were identified on Al₂O₃, TiO₂ and ZrO₂, among which ZrO₂ was the best to stabilize atomically dispersed Pt. Compared to single-atom Pt catalysts prepared through the conventional impregnation method, samples synthesized by flame spray pyrolysis displayed excellent catalytic performance in CO oxidation, methane combustion and methane partial oxidation reactions. Characterization results revealed that flame spray pyrolysis favoured the formation of tetragonal-monoclinic phase of ZrO₂ with improved redox property, thus leading to enhanced catalytic activity in high-temperature applications.

由于在苛刻的反应条件下热力学上有利的金属烧结，因此获得用于高温应用的稳定单原子催化剂（SAC）仍然具有挑战性。利用高温工艺条件（> 1000°C），我们在此报告通过火焰喷雾热解制备热稳定的金属氧化物负载的单原子Pt催化剂。在评估的四种常见载体（Al ₂ O ₃，SiO ₂，TiO ₂和ZrO ₂）中，在Al ₂ O ₃，TiO ₂和ZrO ₂上鉴定出单原子Pt物种，其中ZrO ₂是稳定原子分散的铂的最佳方法。与通过常规浸渍方法制备的单原子Pt催化剂相比，火焰喷雾热解合成的样品在CO氧化，甲烷燃烧和甲烷部分氧化反应中表现出出色的催化性能。表征结果表明，火焰喷雾热解有利于ZrO ₂的四方单斜晶相的形成，具有改善的氧化还原性能，从而导致高温应用中的催化活性增强。