Silver-loaded spherical activated carbon (Ag-SAC) was synthesized by liquid phase ion exchange using phenolic weak acid cation exchange resin, carbonization and activation with CO2. The adsorptive capacity and selectivity of Ag-SAC for thiophene (T), 3-methylthiophene (3-MT) and 2,5-dimethylthiophene (2,5-DMT) were investigated by the fixed bed adsorption experiments under ambient conditions. The results showed that the saturation capacities of Ag-SAC for T, 3-MT and 2,5-DMT were 0.733, 0.925 and 1.143 mg-S/g-A, respectively and the adsorptive selectivity of the adsorbent for different sulfur compounds followed the order: 2,5-DMT > 3-MT > T. The effects of toluene and cyclohexene on the adsorptive performance were also studied. The results indicated that the presence of toluene and cyclohexene led to a reduction of total saturation capacity by 57 and 33 %, respectively.

Phenolic weak acid cation exchange resin was chosen as carbon precursor to prepare spherical activated carbon(SAC) by carbonization and activation with CO2.The product was characterized by infrared spectrum analysis and N2 adsorption,and the results showed that the specific surface area and pore volume were 799.567 m2/g and 0.969 cm3/g,respectively.The saturation capacity for benzothiophene was10.3 mg /g.The equilibrium experimental data were fitted to the Langmuir and Freundlich models,and Freundlich model gave a better correlation,which meants there was heterogeneity in the sites of the SAC adsorbents.Pseudo-first-order(PFO),pseudo-second-order(PSO),modified pseudo-n-order(MPnO)and mixed-order rate equation(MOE) were used to fit the kinetics experimental data.The results indicated that MPnO was the best model to describe the kinetics of adsorption of benzothiophene on SAC.

Phenolic weak acid cation exchange resin was used as carbon precursor to prepare spherical activated carbon supported copper catalyst by ion exchange,carbonization and activation with CO2.The catalyst was characterized by SEM,XRD,AAS and BET.The adsorptive capacities for different sulfur-containing compounds were evaluated by dynamic adsorption experiments and the competitive effects of toluene and cyclohexene were investigated.The mechanism of adsorptive desulfurization was primarily studied as well.The results showed that metals in the spherical activated carbon existed in elemental form and improved the adsorption performance through direct coordination with sulfur atoms.The saturation capacities for thiophene(T),3-methylthiophene(MT),2,5-dimethylthiophene(DMT) and benzothiophene(BT) were 0.938,1.230,1.581 and 3.744 mg/g,respectively.The adsorptive selectivity increased in the order of TMTDMTBT.After toluene and cyclohexene were added to the model gasoline,the saturation capacity decreased 77% and 56%,respectively,which might be resulted by competitive adsorption through the interaction between copper and π electron of toluene and cyclohexene.

Adsorption is one of the most promising methods in deep desulfurization of gasoline.The activated carbon was modified by HNO3 oxidation,calcinations and loading with metallic ions.the desulfurization performance of the activated carbons was evaluated by adsorptive removal of thiophene from thiophene-cyclohexane binary solution with equilibrium adsorption capacity as the criterion for evaluation.The experimental results show that the surface acidity groups of activated carbon increase considerably by HNO3 treatment and improve its desulfurization performance;The desulfurization rate of modified activated carbon increased through calcinations under N2 atmosphere;loading of Fe,Zn,Cu,Ni ion on the activated carbon improved its adsorption of thiophene,while modified by Fe ion gave the higher desulfurization rate than by other metal ions.Then,the effect of different modification method combination on the activated carbon are studied.The complex modification of active carbon,oxidized firstly by HNO3 before loading active component,its desulfurization efficiency greatly enhanced,and then impregnated by Fe ion,gave the highest desulfurization rate,which could reach 85%for the thiophene.

carbon-nickel microcrystalline composites were synthesized by cation exchange of type D001 cation exchange resin followed by carbonization and activation.Thermogravimetry and infrared spectrum analysis showed that the sulfonic group of cation exchange resin occured pyrolysis and generated sulfonyl group followed by carbonization and activation.The appearance of carbon materials was glossy black spherical particles,was made up of carbon-nickel microcrystalline composite structure,mainly for microporous,specific surface area and adsorption capacity of thiophene were 343.23m2/g and 13.20mg/g,respectively.