Surface properties of activated carbon from different raw materials

Activated carbons(ACs) with different surface properties were prepared from different raw materials.N 2 adsorption,pH value,Boehm titration,Temperature-programmed reduction(TPR) and FTIR were employed to characterize the pore structure and surface chemical properties of the ACs.The results show that AC from bituminous coal(AC-B) has more meso-pores,higher pH value,more carboxylic groups and basic site than ACs from coconut shell and hawthorn(AC-C,AC-H).Oxygen in the mixture gas has great effect on SO2 catalytic oxidation/oxidation ability of AC-B.In the absence of oxygen,the adsorbed SO2 on AC-B is 0.16 mmol/g and the conversion ratio of adsorbed SO2 to SO 3 is 22.07%;while in the presence of oxygen,the adsorbed amount of SO2 is 0.42 mmol/g,and all of the adsorbed SO2 was totally converted to SO 3.This feature of AC-B is consistent with its higher pH value,basic site and the reaction ability with H 2 from TPR.The conversion ratios of SO2 absorbed on both AC-C and AC-H were 100%,respectively.

Activated carbons （ACs） with different surface properties were prepared from different raw materials. N2 adsorption, pH value, Boehm titration, Temperature-programmed reduction （TPR） and FTIR were employed to characterize the pore structure and surface chemical properties of the ACs. The results show that AC from bituminous coal （AC-B） has more meso-pores, higher pH value, more carboxylic groups and basic site than ACs from coconut shell and hawthorn（AC-C, AC-H）. Oxygen in the mixture gas has great effect on S02 catalytic oxidation/oxidation ability of AC-B. In the absence of oxygen, the adsorbed SO2 on AC-B is 0.16 mmollg and the conversion ratio of adsorbed S02 to S03 is 22.07~; while in the presence of oxygen, the adsorbed amount of S02 is 0.42 retool/g, and all of the adsorbed S02 was totally converted to SO3. This feature of AC-B is consistent with its higher pH value, basic site and the reaction ability with H2 from TPR. The conversion ratios of S02 absorbed on both AC-C and AC-H were 100%, respectively.