CATALYST FOR REMOVING NITROGEN OXIDES AND METHOD FOR REMOVING NITROGEN OXIDES

摘要

A catalyst having an activity for removing nitrogen oxides (DeNOx activity) at a low temperature region of 200 to 350 DEG C, which is obtainable by adding, to a platinum-based catalyst, tellurium and also, at least one member selected from among an alkali metal, an alkaline earth metal, boron, zinc, phosphorus, tungsten, molybdenum, tin and cerium and/or a zeolite; and a method for removing nitrogen oxides using the catalyst. A method for maintaining the DeNOx activity of the above catalyst in a wide temperature region of 200 to 600 DEG C which comprises combining the above catalyst with a Ag- or Cu-based catalyst which has high activity at 300 DEG C or more is also disclosed.