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Fluorite-like complex oxide compositions, Ce0,9Zr0,05Me0,05O2-δ, where Me represents La, Nd, and Ho, were synthesized via co-precipitation in both aqueous and aqueous-organic solvents. The samples were characterized using X-ray fluorescence spectroscopy (EDX), X-ray diffraction analysis(XRD), scanning electron microscopy (SEM), and low-temperature nitrogen adsorption. The catalytic activity of the samples in the deep methane conversion reaction was determined using a flow-through method. A correlation between the catalytic activity of the materials and the nature of the rare earth dopant was established. It was demonstrated that the most active catalytic systems are solid solutions of Ce0,9Zr0,05Me0,05O2-δ, which can also be considered as promising supports for active components such as Pt and Pd.