| 摘要 |
PURPOSE:To make it possible to purify combustion exhaust gas efficiently by allowing a combustion exhaust gas containing a small amount of lower hydrocarbon, nitrogen oxide and carbon monoxide as well as a large amount of oxygen to react catalytically in the presence of a catalyst consisting of gallium supported with a carrier of ZSM-5 type zeolite. CONSTITUTION:Combustion exhaust gas, containing a small amount of lower hydrocarbon, nitrogen oxide and carbon monoxide as well as a large amount of oxygen, which generates in a rare combustion direction, is allowed to come in contact with a catalyst consisting of 0.1 to 10wt.% of gallium supported by a carrier of ZSM-5 type zeolite, mordenite type zeolite or ferrierite type zeolite at 300 to 600 deg.C, for chemical reaction in the presence of the catalyst. Further, a small amount of lower hydrocarbon (e.g. propane) is added, if necessary, to the combustion exhaust gas. Consequently, it is possible to reduce and purify the nitrogen oxide efficiently over a wide range of reaction temperature, and also purify lower hydrocarbon and carbon monoxide as well as newly added lower hydrocarbon efficiently. |
