| 摘要 |
PURPOSE:To remove nitrous oxide with a high removing rate even at lox temp. by depositing transition metal on mordenite having specified or higher silica/ alumina ratio or ZSM-5 and bringing a gas to be treated containing nitrous oxide and mixed with hydrocarbon reducing gas into contact with the transition metal. CONSTITUTION:Transition metal is deposited on a mordenite having >10 silica/ alumina ratio or ZSM-5 and a gas to be treated containing nitrous oxide and mixed with hydrocarbon reducing gas is brought into contact with the deposited transition metal. As for the transition metal, cobalt, iron, nickel, manganese, ruthenium, rhodium, iridium, or the like is used. These transition metals are deposited on a catalyst of the mordenite or ZSM-5 by an ion exchange method or the like. The hydrocarbon reducing gas is propane, ethylene, propylene, etc., and is mixed by the number of the moles or larger necessary to decompose N2O. For example, when propane is used, about >=1/5 time as the amt. of N2O is needed. |
