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Various sizes of monodisperse spherical Y2O3 particles were synthesized using homogeneous precipitation method as support of Pd–Ni catalysts for oxy-CO2 reforming of methane reaction. Characterization results show that particle size and crystal size of Y2O3 particles decreases with decreasing pH of precursor solution from Y5 to Y3. TPR results of Y2O3 particles show that the intensity of reduction...