In order to use coke oven gas (COG) as a chemical feedstock and/or city gas, it is necessary to reduce or eliminate various impurities, especially sulfur compounds. An adsorbent to remove a sulfur compound, carbon disulfide (CS2), at around room temperature is investigated. Calcium silicate impregnated with diethanolamine is found to show high adsorption activity in the low temperature range of 40 similar to 50 degrees C. In COG containing large amounts of hydrocarbons and carbon dioxide, the adsorbent removes 100% of CS2 for 280 days at 45 degrees C and a space velocity of 99 h(-1). By using this adsorbent and the previously reported K2CO3 impregnated alumina catalyst, more than 96% of CS2 and 76% of carbonyl sulfide, which account for most organic sulfur compounds in COG, are removed for 300 days at 45 degrees C under atmospheric pressure.