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The present work deals with the synthesis of nanostructured Co-MgO mixed oxides with different weight ratios of Cobalt by a facile co-precipitation method as a catalyst for low temperature CO oxidation. The prepared samples were characterized by X-ray diffraction (XRD), N 2 adsorption/desorption (BET), Fourier transform infrared spectroscopy (FTIR) and Transmission and scanning electron microscopies (TEM and SEM) techniques. The results revealed that inexpensive cobalt-magnesium mixed metal oxide nanoparticles have a high potential as catalyst in low temperature CO oxidation. The Co-MgO mixed oxide with 30 wt.% cobalt had the highest activity. The results showed that the catalysts pretreated under O 2 containing atmosphere possessed higher activity compared to the catalyst pretreated under H 2 atmosphere. Co-MgO catalyst showed a good repeatability in reaction condition. The stability test exhibited that the Co-MgO mixed oxides were highly stable for CO oxidation over a 30 h time on stream in the feed gas containing high amount of moisture and CO 2 . Downloaded by [Gebze Yuksek Teknoloji Enstitïsu ] at 07:15 23 December 2014 2