Desulfurization Performance Of Supported Graphene And Mesoporous Matsrials

Many countries have formulated series of stringent criteria for restrictingthe content of sulfur in fuel with the requirement to improve the quality of theenvironment. The traditional hydrodesulfurization technologies are beingchallenged, and demanding developing new deeper desulfurizationtechnologies. π-complexion adsorption desulfurization has been widelyinvestigated for its high selectivity, good desulfurization performance, easyregeneration and low cost.In this paper, nanometer metal oxide supported on graphene(Gr) asadsorbents(Cu2O/Gr, CuO/Gr and NiO/Gr)were prepared by chemicalreduction and thermal reduction respectively, using the cation exchangeproperty of graphite oxide. The adsorbents were characterized by SEM, XRD,BET, BJH. The model fuel was prepared by isooctane as solvent andthiophene as the sulfuric compound. The effect of temperature and time on the adsorption desulfurization performance of Cu2O/Gr, CuO/Gr and NiO/Gr asπ-complexion adsorbents were studied through the static method. The resultsshowed that the adsorption desulfurization for4h at50was the optimumcondition. The adsorption desulfurization isotherms were fitted by theFreundlich equation and Langmuir equation, the results showed that, theFreundlich isotherm equation fitted the adsorption equilibrium date points well,the adsorption was favorable at these studied conditions. The saturatedadsorption capacity of sulfur with a concentration of896.4ppmw on CuO/Gr,NiO/Gr, Cu2O/Gr and Gr was54.1mg g-1,38.3mg g-1,35.0mg g-1, and18.3mg g-1respectively, at50. The order of the adsorption desulfurizationcapacity was CuO/Gr NiO/Gr Cu2O/Gr Gr.The mesoporous carbon platelet(MCP) was prepared by carbonizationhexagonal mesoporous silica platelet as hard template which was synthesizedby sol-gel method, and the size of the mesoporous carbon platelet was1.5μm.The synthesized samples were characterized by SEM, BET, BJH. TheCuCl/MCP adsorbent was prepared by thermal diffusion method. Themonolayer dispersion thresholds of CuCl supported on mesoporous carbonplatelets was4mmol g-1by analyzing the nitrogen desorption-adsorption data.The desulfurization performance of the CuCl(4mmol)/MCP adsorbent wasinvestigated via static adsorption experiments. The result showed that theefficiency of desulfurization was90%.