Abstract
A new clean catalytic process for liquid phase selective oxidation of toluene has been carried out on CeO2 promoted sulfated TiO2 (SO42−/TiO2−CeO2, abbreviated as STC) catalyst with ozone−air at ambient temperature and atmospheric pressure. Neither solvent nor promoters are needed in the reaction system. STC were found to exhibit good catalytic reactivity for the selective oxidation of toluene. For comparison, a series of single and complex oxides were also investigated including pure TiO2, SO42−/TiO2 (abbreviated as ST). The total conversion and yield to the selective products exhibited by STC were superior to those catalysts exhibited in the presence of ozone. The highest conversion of toluene was found to be 9.7% with 77% selectivity to benzaldehyde and benzyl alcohol on the STC. The anatase phase was found to be dominating in the STC by means of X-ray diffraction. By utilization of the N2 adsorption method, it was detected that the Brunauer−Emmett−Teller surface area of STC was higher than other samples. Other techniques such as scanning electron microscopy, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, and energy dispersive X-ray spectroscopy were also employed to characterize the property of catalysts.
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