Abstract
We have developed a novel catalyst for a selective catalytic reduction (SCR) of NOx with ammonia. The catalyst can be applied for a marine use. It is composed of the natural zeolites and the metal oxides, and its activity of NOx reduction is higher in a low temperature (150-250°C) than that of commercial SCR catalysts. In addition to this high activity, the oxidation activity of SO2 is low, in comparison with the commercial one: little amount of ammonium sulfate forms. Therefore, the catalyst solves the problems of corrosion, plugging of a pipping or a heatexchanger, and the catalytic activity-decrease to be due to a scaling of a ammonium sulfate on the catalytic surface.
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