Preparation, Characterization And Adsorption Desulfurization Performance For Gasoline And Diesel Of Macropore And Mesoporous Materials

Petrol and diesel fuel oil are the main fuels of cars, ships, aircraft, and all kindsof large-scale machinery, and the ideal fuels of fuel cell. But it contains a lot ofsulfur-containing compounds, these sulfur-containing compounds will produce SOxafter burning that is harmful for environment. All over the world are increasinglydemanding on the environment, and many countries such as the United States, Europeand China have made clear rules for sulfur content of diesel fuel, therefore it isimperative to remove the sulfur-containing compounds of gasoline and diesel. In orderto look for an adsorbent that has a larger sulfur capacity and a good ability of selectiveadsorption desulfurization. We prepared mesoporous AlSBA-15(SiO2/Al2O3=?,100,50,30,20,10) and5-30%Ni-AlSBA-15(30) sorbents by one-step synthesis method,synthesised three-dimensionally ordered macroporous (3DOM) oxide TiO2,Fe1Mn4Ox by polystyrene (PS) colloidal crystal template and mesoporous Ni-r-Al2O3and Ce-r-Al2O3by the method of sol-gel.(1) mesoporous AlSBA-15(SiO2/Al2O3=?,100,50,30,20,10) and5-30%Ni-AlSBA-15(30) sorbents were characterized by means of small-angle X-raydiffraction (XRD), wide-angle X-ray diffraction (XRD), N2adsorption, Fourierinfrared (FT-IR), pyridine Fourier infrared (Py-FT-IR) and inductively coupled plasma(ICP) techniques. The results showed that the SBA-15series of adsorbent has largerspecific surface area, uniform pore size distribution, and confirmed that aluminumatoms could enter the framework and Ni was dispersed highly on the support. Thedesulfurization performances were investigated using model diesel and commercialdiesel at75oC and ambient pressure. The results showed that20%Ni-AlSBA-15(30)had the best desulfurization ability. The characterization results also revealed that thehexagonal p6mm symmetry mesoporous structure remained intact in the sorbents afterfour successive desulfurization/regeneration cycles.(2) The three-dimensionally ordered macroporous (3DOM) TiO2and Fe1Mn4Oxsorbents were characterized by means of N2adsorption, FT-IR, and SEM techniques.The results show that the polystyrene microspheres have roughly the same sizeand well-organized configuration. We can see that TiO2and Fe1Mn4Oxalso haveordered pore structure after calcination by SEM. The desulfurization performanceswere investigated using model diesel at75oC and ambient pressure by fixed bedreactor. Results show that desulfurization ability of TiO2is better than Fe1Mn4Ox. The adsorption desulfurization ability of TiO2can achieve about71.43%of the freshsample after two successive desulfurization/regeneration cycles, it showed thatthe regeneration ability of TiO2was good.(3) The mesoporous Ni-?-Al2O3and Ce-?-Al2O3series sorbents werecharacterized by nitrogen adsorption, X-ray diffraction (XRD), temperatureprogrammed reduction technology (H2-TPR). The results show that additionof suitable amount of nickel or cerium almost does not affect the physical propertiesof ?-Al2O3. The desulfurization performances were investigated using commercialdiesel at55oC and ambient pressure. The results showed that20%-Ni-?-Al2O3hadbettert desulfurization ability than20%-Ce-?-Al2O3, because part of the activecomponent on20%Ce/?-Al2O3lost in the process of desulfurization.