Synthesis And Characterization Of Pure And Zro_2-doped Nanocrystalline Cuo-nio System

摘要

The physicochemical, surface and catalytic properties of pure and doped 0.25CuO-NiO solids prepared by sol-gel method were investigated. The dopant concentration was 2, 4 and 6 mol% ZrO_2. The solids investigated were calcined at 400 and 600 ℃. The techniques employed were XRD, EDX, TEM, surface excess oxygen, nitrogen adsorption at -196 ℃ and catalytic oxidation of CO by O_2 using both static and flow methods. The results revealed that the investigated system dissolved 4 mol% ZrO_2 by heating at 400 ℃. This process was accompanied by a significant increase in the S_(SET)and V_P with subsequent decrease in the (r) values of the doped adsorbent. ZrO_2-doping of the system investigated followed by calcination at 400 and 600 ℃ led to a considerable increase in its catalytic activity in CO oxidation by O_2 using static and flow methods. The doping process was not accompanied by any change in the activation energy of the catalyzed reaction.