| 摘要 |
PURPOSE:To provide a method for purifying waste combustion gas generated from lean burn system and a catalyst used for the method. CONSTITUTION:The waste combustion gas containing small quantity of a lower hydrocarbon, nitrogen oxides, carbon monoxide and a large quantity of oxygen is allowed to react in the presence of the catalyst made by allowing gallium to be carried (carrying quantity is 0.1-10wt.%) on a carrier made of ZSM-5 type zeorite or ferrierite type zeorite. If necessary, a small quantity of a lower hydrocarbon is newly added into the waste combustion gas, total quantity of the lower hydrocarbon contained in the waste combustion gas and the newly added lower hydrocarbon is a quantity required for reducing and purifying nitrogen oxides contained in the waste combustion gas. The lower hydrocarbon contained in the waste combustion gas is 1-4C lower hydrocarbon and the newly added hydrocarbon consists of at least one kind of methane, ethane and ethylene. |
