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    Platelet Ceria Catalysts from Solution Combustion and Effect of Iron Doping for Synthesis of Dimethyl Carbonate from CO2
    (2025-01-01)
    Rusta, Nicoletta
    ;
    Mameli, Valentina
    ;
    Ricci, Pier Carlo
    ;
    Porcu, Stefania
    ;
    Seeharaj, Panpailin
    Solution combustion (SC) remains among the most promising synthetic strategies for the production of crystalline nanopowders from an aqueous medium, due to its easiness, time and cost-effectiveness, scalability and eco-friendliness. In this work, this method was selected to obtain anisometric ceria-based nanoparticles applied as catalysts for the direct synthesis of dimethyl carbonate. The catalytic performances were studied for the ceria and Fe-doped ceria from SC (CeO<inf>2</inf>-SC, Ce<inf>0.9</inf>Fe<inf>0.1</inf>O<inf>2</inf>-SC) in comparison with the ceria nanorods (CeO<inf>2</inf>-HT, Ce<inf>0.9</inf>Fe<inf>0.1</inf>O<inf>2</inf>-HT) obtained by hydrothermal (HT) method, one of the most studied systems in the literature. Indeed, the ceria nanoparticles obtained by SC were found to be highly crystalline, platelet-shaped, arranged in a mosaic-like assembly and with smaller crystallite size (≈6 nm vs. ≈17 nm) and higher surface area (80 m<sup>2</sup> g<sup>−1</sup> vs. 26 m<sup>2</sup> g<sup>−1</sup>) for the undoped sample with respect to the Fe-doped counterpart. Although all samples exhibit an anisometric morphology that should favor the exposition of specific crystalline planes, HT-samples showed better performances due to higher oxygen vacancies concentration and lower amount of strong basic and acid sites.