| In recent years, the activated carbon used as the adsorbent attracted widespread concern in the oil desulfurization, for its low production costs and high adsorption capacity, etc. The raw materials of traditional method to product activated carbon are mainly coal and wood, to find new cheap renewable resources as an alternative raw materials to produce activated carbon is more and more important with the gradual depletion of natural resources and a growing awareness of environmental protection. Biomass attract more and more researchers’vision. There are many literatures in domestic and international on preparation of activated carbon with adoption date palm kernel, corn cobs, coconut, almond shells, peanut shells, palm shell, durian skin, bamboo, etc. Furfural residue is the wastes of poly pentose decompose to product furfural. There are about6.60to8.25million tons of furfural residue per year in china. Furfural residue is rich in lignin, cellulose, hemicellulose and poly pentose, and the content of C element is nearly50%.Thus, furfural residue is an excellent raw material for preparing active carbon, with a very good recycling value.In this paper, furfural residue was used as raw materials to prepare activated carbon and its’ desulfurization performance were studied. Firstly, the pyrolysis characteristics of furfural residue was studied by thermal gravimetric. The evolution of volatiles from furfural residue pyrolysis were studied by associated FTIR. And450℃was selected as carbonization temperature.Secondly, furfural residue was used to prepare activated carbon by two-step activation method using potassium hydroxide (KOH) as activating agent. The influence of activation temperatures and time, KOH/C ratios and impregnation time of the prepared activated carbon on the pore distribution and adsorption capacity were investigated. The porous structures of the activated carbon were investigated by N2adsorption isotherms using BET equation, BJH and DFT method. The characterization of carbons were performed by SEM, FT-IR and XRD. The results show that the best sample of activated carbon is obtained under the conditions:activation temperature800℃, activation time3hour, KOH/C ratios3:1and impregnation time12hour. The prepared activated carbon has high specific surface area and large pore volume, with3290.5m2/g and0.8825cm3/g, respectively.The iodine and methylene blue adsorption value of the carbon are2107.32mg/g and39.67mL/0.1g, respectively.Finally, Selected KOH activated carbon, ZnCl2activated carbon and a commodity activated carbon as adsorbent to study benzothiophene removal performance from diesel. The pore structure and acidic group content of three activated carbon were analyzed by NLDFT and Boehm titration, respectively. And explored the relationship between both two to activated carbon adsorption capacity of benzothiophene. And then discussed the impact of adsorbent dosage to its adsorption capacity. After that the detection performance of the repeated use of activated carbon was studied. Result shows that KOH activated carbon has the highest units adsorption amount, followed by H3PO4activated carbon, ZnCl2activated carbon and commodity activated carbon. There are approximately linear relationship between benzothiophene adsorption amounts of activated carbon to the pore volume less than the lnm. This is also applies to the surface acidic groups amount of activated carbon. The sulfur removal rate of activated carbon was only reduced by about4%after used4times, suggesting that the actived carbon have a better repeated use performance. |
