| Summary: | Carbon dioxide reforming of methane (CRM) represents a promising method that can effectively convert CH<sub>4</sub> and CO<sub>2</sub> into valuable energy resources. Herein, ultrathin Ni<sub>x</sub>Mg<sub>1−x</sub>O nanoplate catalysts were synthesized using a scalable and facile process involving a one-pot, co-precipitation method in the absence of surfactants. This approach resulted in the synthesis of planar Ni<sub>x</sub>Mg<sub>1−x</sub>O catalysts that were much thinner (˂8 nm) with larger specific surface area (>120 m<sup>2</sup>/g) in comparison to Ni<sub>x</sub>Mg<sub>1−x</sub>O catalysts prepared by conventional methods. The ultrathin Ni<sub>x</sub>Mg<sub>1−x</sub>O nanoplate catalysts exhibited high thermal stability, catalytic activity, and durability for CRM. Especially, these novel catalysts exhibited excellent anti-coking behavior with a low carbon deposition of 2.1 wt.% after 36 h of continuous reaction compared with the conventional catalysts, under the reaction conditions of the present study. The improved performance of the thin Ni<sub>x</sub>Mg<sub>1−x</sub>O nanoplate catalysts was attributed to the high specific surface area and the interaction between metallic nickel nanocatalysts and the solid solution substrates to stabilize the Ni nanoparticles.
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