Abstract
A series of CoxCe1-xO2-δ (x = 0.05−0.6) oxides were synthesized through non-ionic surfactant hydrothermal method and applied for catalytic toluene oxidation. Various characterizations were performed to investigate the relation between structure and activity of the catalysts, including XRD, N2 adsorption-desorption, Raman spectra, TEM, H2-TPR, O2-TPD, XPS and in situ DRIFTS. CoxCe1-xO2-δ shows higher catalytic performance than pure Co3O4 and CeO2, meanwhile Co0.2Ce0.8O2-δ exhibits the best catalytic activity for toluene oxidation in the presence and absence of water, moreover, no obvious difference in activity among three successive testing runs. This good activity can be mainly attributed to the strong interaction between Co and Ce oxides to form Co0.2Ce0.8O2-δ solid solution, leading to abundant surface active oxygen species, more surface Co3+ and Ce3+ species. In situ DRIFTS is used to probe the catalytic reaction process, which reveals that toluene can be rapidly adsorbed and transferred to benzoate species, finally oxidized into CO2 and H2O.
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