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The diesel soot combustion was studied using catalysts prepared by impregnation with lithium nitrate and/or gold on zirconium oxide (ZrO 2 ), hydrated zirconium oxide, and silica (SiO 2 ). Catalysts were characterized by elemental analysis, atomic absorption spectrophotometry, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), and X-ray photoelectron spectroscopy (XPS). Measurements of catalytic activity were performed in a fixed bed reactor with a NO/O 2 feed. The NO reacts with the Li 2 O generating "in situ" lithium nitrate that participates in the oxidation of diesel soot and accelerates the reaction rate. All catalysts containing lithium nitrate exhibit a good activity for soot oxidation, and the gold addition substantially increases selectivity to CO 2 .