The hydrogen sulfide (H2S) removal performance.of limonite in the presence.of coke oven gas (COG) components (H-2, CH4, CO, CO2, and H2O) has been studied in.a cylindrical flow-type quartz-made fixed-bed reactor at 300-800 degrees C under a high space velocity of 51,000 h(-1) to develop a novel hOt gas cleanup method. The H2S removal behavior by reduced limonite in He does not change at the temperatures examined. On the other hand, the breakthrough curves in 50%H-2/He depend on the temperature; and high performance is found at lower temperatures. An investigation of the breakthrough curves of H2S in the presence of COG,components at 300-600 degrees C reveals that the addition of 30%CH4-14 to 50%H-2/He does not influence the performance below 500 degrees C, whereas the coexistence of 5%CO with 50%H-2/He drastically clecreaseS the H2S removal ability of reduCed,limonite. In addition, the breakthrough curves in 5%CO2 coexisting with 50%H-2/30%CH4/5% CO/He are similar to those of 50%H-2/30%CH4/5%CO/He. However, the addition of 5%H2O to 5Q%H-2/30%CH4/5%CO/He dramatically improves the H2S removal performance of reduced limonite. Similar tendencies are observed in simulated COG (50%H-2/30%CH4/5%CO2/5%H2O/He). Furthermore, the H2S breakthrough curve strongly depends 'on the space velocity.