DENITRATION METHOD AND CATALYST USED THEREIN

摘要

PURPOSE:To obtain high denitration capacity within a temp. range wider than individual catalysts by arranging a plurality of denitration catalysts having different reaction temps. capable of obtaining the max. activities in a reaction gas passage. CONSTITUTION:In a denitration method for removing nitrogen oxide in exhaust gas containing 5000ppm or more of oxygen using hydrocarbon as a reducing agent, two or more kinds of catalysts 3-5 having different reaction temps. capable of obtaining the max. activities are provided in an exhaust gas passage direction 2 in series to obtain high activity within a temp. range wider than the individual catalysts. As a result, in the denitration reaction due to the catalyst, high denitration capacity can be obtained within a temp. range wider than a conventional catalyst.