ADSORPTIVE REMOVAL OF SULFUR COMPOUNDS IN KEROSENE BY USING RICE HUSK ACTIVATED CARBON

摘要

Japanese rice husks were carbonized in N_2 at 400℃ for 1 h and then were activated in CO_2 at 850℃ for 1 h. The capacities of rice husk activated carbons (RHACs) to adsorb refractory sulfur compounds of dibenzothiophenes (DBTs) were evaluated correlating with their textural and chemical characteristics. The RHACs of 0.5 g were soaked in commercial kerosene of 15.0 g at 10℃ for 100 h. A micro-porous activated carbon fiber (ACF) having large specific surface area (2336 m~2/g) and total pore volume (1.052 cmVg) was also tested for a comparison purpose. The largest DBTs adsorption capacity (0.069 mg-S/g-Ads and 77 % performance to the ACF) was observed, despite much smaller specific surface area (473 m~2/g) and total pore volume (0.267 cm~3/g) compared to those of the ACF. Predominant adsorption sites for DBTs in the RHACs were deemed to be slit-shaped micropores of which pore width was less than 0.7 nm.