The surface and catalytic properties of the NiO/Al2O3 system after deposition of 3 to 7% zinc oxide on its surface and heat treatment at 400, 600, and 800 degrees C were investigated by X-ray diffraction analysis, nitrogen adsorption at -196 degrees C, and catalytic oxidation of carbon monoxide by oxygen at 150-250 degrees C. It was shown that calcination of the catalyst at 400 degrees C decreases the specific surface area, while it increases it at 600 and 800 degrees C. The decrease in the specific surface area is accompanied by an increase in the size of the NiO/Al2O3 crystallites. The activity of the catalysts calcined at 400 degrees C in oxidation of carbon monoxide by oxygen, manifested by a constant reaction rate, increases with an increase in the zinc oxide content on the surface. After deposition of the zinc oxide, the mechanism of the oxidation reaction remains as before, but the concentration of active centers in the catalyst changes.