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A series of mesoporous ZrO2–SiO2 microspheres with different amounts of silica were synthesized by a polymerization-induced colloid aggregation process, using zirconyl chloride and commercial SiO2 colloids as the raw materials. The microspheres were characterized by scanning electron microscopy (SEM), N2 adsorption–desorption isotherms, X-ray powder diffraction (XRD) and Fourier transform infrared...