摘要
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 (Al 2 O 3 , SiO 2 , TiO 2 and ZrO 2 ) evaluated, single-atom Pt species were identified on Al 2 O 3 , TiO 2 and ZrO 2 , among which ZrO 2 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 ZrO 2 with improved redox property, thus leading to enhanced catalytic activity in high-temperature applications.