| 摘要 |
PURPOSE:To obtain the titled fibers, effective for adsorbing and removing polar gases, e.g. SO2, by heat-treating pitch fibers in an atmosphere containing an oxidizing gas, carbonizing the heat-treated fibers, and activating the carbonized fibers. CONSTITUTION:Fibers formed from pitch are first heat-treated in an atmosphere containing an oxidizing gas, e.g. oxygen, at 50-400 deg.C, and infusibilized. The resultant infusibilized pitch fibers are then carbonized in an atmosphere containing ammonia gas at 200-900 deg.C, and then activated in an atmosphere containing steam or carbon dioxide usually at 700-1,000 deg.C to give the aimed fibers. The above-mentioned carbonization treatment is preferably carried out in an inert gas atmosphere containing 5-50vol% concentration NH3 gas. |
