| 摘要 |
<p>A method for removing NOx which, even when the molar ratio of NOx components in a gas to be treated is such that NO2 > NO, does not cause a lowering in denitration performance at a reaction temperature of 300 °C or below. The method for removing NO2 comprises selectively reducing and removing NOx contained in a gas to be treated, of which the NO2 content is higher than the NO content, that is, having an (NO2) to NOx ratio exceeding 0.5, in the presence of a denitration catalyst by using ammonia as a main reducing agent, and a material which can selectively reduce and remove excess oxygen accumulated on a catalytically active point at 300 °C or below, for example, at 300 to 150 °C, in other words, a material which is reactive with excess oxygen on the catalytically active point and can be oxidized at 300 °C or below, is added to a denitration reaction system.</p> |
