| 摘要 |
PURPOSE:To offer a catalyst which can maintain its high activity to sulfur oxide- containing exhaust gas for a long period, by further supporting wolfram oxide on a copper sulfate-carrying silica/alumina catalyst to be used in the catalytic reduction of nitrogen oxides by ammonia. CONSTITUTION:The catalyst comprises copper sulfate and wolfram oxide supported on an active silica/alumina carrier containing 40-90wt% silica. If the silica content is less than the lower limit, the deterioration of the catalyst is conspicuous in the disposal process of sulfur oxide-containing exhaust gas. If the silica content exceeds the upper limit, the activity, especially the initial activity, of the catalyst is insufficient. The wolfram oxide has an effect of further enhancing the catalytic activity of the copper compound. The amount of wolfram oxide is 0.12-0.22g/1g-carrier. |
