摘要
We demonstrate a facile aerosol-based approach to fabricate hybrid nanostrcutures, NiPdO <sub>x</sub> -CeO <sub>2</sub> nanoparticles deposited on the SiO <sub>2</sub> nanoparticle clusters, for the catalysis of steam-promoted CO <sub>2</sub> reforming with methane. Ultrafine crystallites of active metal and promoter (≈5 nm) are created with tunable cluster sizes and chemical compositions. A superior catalytic performance achieves at low temperature (550 °C): remarkable turnover frequency (≈2 s <sup>−1</sup> ), tunable H <sub>2</sub> /CO ratio (1.1–1.9) and high 100-h operation stability. Incorporation of SiO <sub>2</sub> nanoparticle cluster as support material increases dispersion of active metals and suppresses metal sintering during material synthesis and catalysis. Hybridization with Pd significantly improves the activity of Ni-based catalyst especially ≤600 °C. Addition of steam suppresses the coke formation by > 10 times. The work demonstrates a prototype study of developing bimetallic hybrid nanocatalysts homogeneously dispersed with promoter on the NPC mesoporous support by design, showing promise for the syngas production via synergistic catalysis of methane-CO <sub>2</sub> reforming.