| 摘要 |
PURPOSE:To obtain a practical catalyst having high NOx removal efficiency even at high temperatures by carrying ion in a specific ratio on a high silica- type zeolite having SiO2/Al2O3 mole ratio higher than or equal to a certain ratio. CONSTITUTION:On a high silica-type zeolite having at least 20 mole ratio of SiO2/Al2O3 and high resistance to heat and SOx such as ZSM-5, etc., iron as an active component in 0.5-5wt.%, expressed in terms of Fe2O3, is carried. A waste gas denitrification catalyst obtained in this way can make NOx harmless by selective reduction using NH3 even at high temperatures. As a result, the catalyst is high in practical value and useful industrially. |
