High combustion activity of CH < inf> 4 and catalluminescence properties of CO oxidation over porous Co < inf> 3 O < inf> 4 nanorods

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The highly porous Co 3O 4 nanorods are prepared by a simple hydrothermal method, in which CO(NH 2) 2 is employed as precipitating agent, and K60 (PVP, polyvinylpyrrolidone) is used as surfactant to improve the stability of the nanoparticles. For comparison, the bulk Co 3O 4 is prepared by thermal decomposition of cobalt nitrate. The samples are characterized by field emission scanning electron microscopy (FE-SEM), energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), high-resolution transmission electron microscopy (HRTEM), selected area electron diffraction (ED), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, N 2 adsorption, Thermogravimetric analysis (TG), H 2-temperature programmed reduction (TPR), CO-, CH 4-, and O 2-temperature programmed desorption (TPD). The catalluminescence (CTL) and catalytic properties of the samples are investigated extensively. The results show that the Co 3O 4 nanorods are composed of nanoparticles, and have a large number of pores with a narrow pore size distribution (1.5-7nm). Compared with the bulk Co 3O 4, the porous nanorods have a higher CTL intensity of CO oxidation, and a higher activity of CH 4 combustion especially at a higher gas hourly space velocity (GHSV), which has been ascribed to its porous structure and larger surface area. © 2011 Elsevier B.V.

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Applied Catalysis B: Environmental