Preparation Of Titanium Pillared Photocatalyst And Research On Oxidative Desulfurization

It is a great challenge for the conventional hydrodesulfurization process because it's the trend to produce and use ultra-deep and zero emissions clean fuels. Photocatalytic oxidative desulfurization is getting more and more attention owning to its mild reactions, low operating cost and deep desulfurization.It is promising to become the substitution or compensation of hydrodesulfurization technique.Titanium pillared photocatalysts had been prepared by sol-gel method with tetrabutyl titanate as the precursor and montmorllinte as the carrier.The samples were characterized by X-ray diffraction(XRD), Fourier transform infrared spectra(FT-IR), transmission electron microscope(TEM), nitrogen adsorption-desorption isotherms measurements. Factors influencing the photocatalytic properties of the samples were discussed, including the ratio of titanium pillared agent and the calcining temperature. The photocatalytic oxidative dusulfurization was conducted with the prepared photocatalyst, O2 as the oxygen resource, model gasoline and acetonitrile as the extraction solvent in the self-made photocatalytic reactor by the irradiating of ultraviolet light.and then the photocatalytic performace of the photocatalyst and factors affecting the photocatalytic desulfurization were studied.By XRD, FT-IR, TEM and nitrogen adsorption-desorption isotherms measurements, it suggests that the specific surface area and pore volume are increasing as the increasing of the titanium pillared agents. When the value of Ti/CEC is 72.7, ion capacity reaches saturation state, and under such a condition, more TiO₂ pillars added contribute little to the enlargement of distance between layers of titanium pillared montmorillonite, the photocatalyst has a higher specific surface area and pore volume. The N2 adsorption-desorption isotherms is type IV according to BDDT, attributed to the mesopore in materials with multi-peak distribution. The critical factor imfluencing the structure and performace of the photocatalyts is the calcination temperature. The titanium pillared photocatalyst appeared good photcatalytic performance and better specific surface area and under the condition of calcination at 350℃for 3 hours, and the reactivy components is anatase.The experiments of the photocatalytic oxidative desulfurization was investigated at last. The results show that the reaction time, the ratio of extraction agent, the added amount of catalysts are the important influenced factors. The optimization research was conducted further with importing the oxygen by the method of bubbling. It founded that the experiment reached a good performance under the condition of the temperature of 25℃, the added amount catalyst of 1g/L and the bubbling rate of 800ml/min. the sulfur content is reduced from 800 to about 10 ppm and it is promising to achieve the deep desulfurization by the process of photocatalytic oxidation.