Synthesis, Characterization and Application of Co–MgO Mixed Oxides in Oxidation of Carbon Monoxide

Abstract

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

Room-Temperature CO Oxidation over Au–Pd Monometallic and Bimetallic Nanoparticle-Supported MgO

“…Based on surface area measurements and assuming the particles are spherical in shape, the theoretical particle sizes (D BET , nm) were also computed and tabulated in Table 1. 41 The surface of MgO seems to be free of big aggregate particles based on the excellent convergence of the particle size values estimated from the XRD and the nitrogen adsorption data. 42 Moreover, the prepared catalysts exhibited type II adsorption isotherms according to the IUPAC classification, which may be due to some mesoporous nature of the catalyst pores (Figure S2a of the ESI).…”

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