摘要
A gas-phase controlled synthesis method is demonstrated to prepare Ni-CeO nanocrystallites decorating on Al O nanoparticle clusters (NPC) for synergistic catalysis of dry reforming of methane with CO (DRM). The method combines the principles of aerosol-phase evaporation-induced self-assembly with colloid-phase stabilization of Al O nanoparticles in sprayed aqueous droplets. Hybrid NPC was successfully created with ultrafine Ni crystallites (<7 nm), tunable chemical composition, cluster size and surface state. A superior high catalytic performance achieved in comparison to the results reported in the literatures: low starting temperature (400 °C), high turnover frequency (2.6 s at 550 °C; 4.0 s at 700 °C), and high selectivity (H /CO = 0.9). Hybridization with Al O NPC and CeO nanoparticle significantly improved operation stability of Ni catalyst over 8-h reaction. The work demonstrates a facile route for gas-phase synthesis of hybrid nanocatalysts using Al O NPC as support matrix for effective low-temperature operations of DRM.