Hydrogenation of CO 2 on Nanostructured Cu/FeO x Catalysts: The Effect of Morphology and Cu Load on Selectivity.

The aim of this work was to study the influence of copper content and particle morphology on the performance of Cu/FeO_x catalysts in the gas-phase conversion of CO₂ with hydrogen. All four investigated catalysts with a copper content between 0 and 5 wt% were found highly efficient, with CO₂ conversion reaching 36.8%, and their selectivity towards C₁ versus C₂-C₄, C₂-C₄=, and C₅₊ products was dependent on catalyst composition, morphology, and temperature. The observed range of products is different from those observed for catalysts with similar composition but synthesized using other precursors and chemistries, which yield different morphologies. The findings presented in this paper indicate potential new ways of tuning the morphology and composition of iron-oxide-based particles, ultimately yielding catalyst compositions and morphologies with variable catalytic performances. [ABSTRACT FROM AUTHOR]