| 摘要 |
PURPOSE:To introduce a prescribed amt. of copper into zeolite in a short time and to obtain a catalyst having high activity by dispersing the zeolite in an aq. soln. of a copper compd. and further adding an aq. soln. of an alkaline compd. CONSTITUTION:Zeolite such as ZSM-5 or mordenite type zeolite is dispersed in an aq. soln. of a copper compd. such as copper sulfate or hydrochloride and an aq. soln. of an alkaline compd. such as the hydrochloride of an alkali metal or an alkali metallic salt of a weak acid is further added to adjust the pH to >=6.0, preferably 6.0-13.0, especially preferably 7.0-10.0. A prescribed amt. of copper can be introduced into the zeolite in a short time and a catalyst having high activity is obtd. When this catalyst is used, ammonia is not generated during pretreatment and NO is efficiently removed. |
