Exsolution of multimetallic particles from high-entropy oxides for CO2 hydrogenation to methanol
Palavras-chave:
CO2 hydrogenation, Nanomaterials, High entropy oxides, ExsolutionResumo
This work reports the synthesis and catalytic evaluation of a high-entropy spinel oxide (Co0.33Ni0.33Cu0.33)(Cr0.5Mn0.5)2O4 as a platform for in situ exsolution of multimetallic nanoparticles active in CO2 hydrogenation to methanol. Structural characterization revealed temperature-dependent exsolution of Cu, Ni, and Co, forming nanoparticles with variable size and composition, from Cu-rich to CuNiCo alloyed phases. Catalytic tests at 100 bar and 200 °C showed that moderate reduction (500 °C) led to the best compromise between activity and selectivity, with a methanol yield of 1.5%; whereas higher temperatures reduced activity but increased alcohols selectivity. These results highlight the potential of high-entropy oxides as versatile and tunable catalysts for designing thermally stable and selective catalysts for CO2 conversion.
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