Synthesis Of Hybrid Ordered Mesoporous Carbon Materials Via Metal Modification And Their Adsorption Desulfurization For Fuels

The sulfur compounds in the fuel are converted to SOx during combustion, which not only results in acid rain, but also poisons catalysts in catalytic converters. And liquid hydrocarbon fuels are candidate fuelsfor use in portable fuel cells. Sulfur concentration in the fuel needs to be reduced to less than 1 ppm for proton exchange membrane fuel cell (PEMFC) and less than 10 ppm for solid oxide fuel cell (SOFC).The ultra-deep hydrodesulfuration has become an important issue in the world wide.In this study, the copper-modified hybrid ordered mesoporous carbonswere synthesized.The desulfurization performance of the aspreparedadsorbents was evaluated by the selective adsorption of dibenzothiophene (DBT) as modelsulfur compound from model fuels at ambient conditions.The influence ofmodification method, the composition, pore structure and surface acidity of substrateon their desulfurization performance were investigated.1. The copper-modified ordered mesoporous carbon-silica nanocomposites(MCSs) were prepared by incipient wetness impregnation method. Compared with the pure silica SBA-15 and pure carbonaceous CMK-3 modified by copper, the copper-modified MCS has higher selectivity for dibenzothiophene(DBT) in competition with benzene. The excellent performanceof copper-modified MCS could be attributed to its hybrid mesoporous carbon-silicanature which is favorable for high dispersion extent of copper and synergistic effect between the carbon substrate and the supported copper species.2.The copper-modified ordered mesoporous carbon-silica-alumina nanocomposites (MCSA) and carbon-alumina nanocomposites (MCA) were prepared by incipient wetness impregnation method. The dispersion extent of copper species increases with the increase of Bronsted acid sites, which results ina higher sulfur adsorption capacity. In addition, the adsorptive desulfurization capacity of the pristine substrate increases with the increase of surface acid amount while is irrelevant with the micropore volume.3. The copper-modified MCS wasprepared by one-spotco-assemblymethod.The sulfur capacity of MCS after copper modification is increased by 49%, which may be attributed tothe high dispersion of half-naked copper particles embeddedinthe pore walls.