Catalyst, method and apparatus for removing nitrogen oxide

摘要

A catalyst having superior heat resistance and being capable of efficiently removing a nitrogen oxide, a removing method using the same, an apparatus including the catalyst described above, and the like are provided. A complex metal oxide containing tungsten, zirconium, and cerium has superior heat resistance and is capable of efficiently removing a nitrogen oxide in the presence of ammonia, the content of cerium oxide and the content of tungsten oxide being 10 to 30 percent by weight and 5 to 14 percent by weight, respectively. Hence, a catalyst which includes a complex metal oxide containing tungsten oxide, zirconium oxide, and cerium oxide, in which the content of the cerium oxide and the content of the tungsten oxide are 10 to 30 percent by weight and 5 to 14 percent by weight, respectively, is effectively used to remove a nitrogen oxide.

主权项

1. A nitrogen-oxide removal catalyst for removing a nitrogen oxide in the presence of ammonia, comprising a complex metal oxide containing tungsten oxide, zirconium oxide, and cerium oxide and having heat resistance to a heat treatment at 800° C. for 3 hours, wherein the content of the cerium oxide is 10 to 30 percent by weight, the content of the zirconium oxide is 61 to 81 percent by weight, and the content of the tungsten oxide is 5 to 14 percent by weight, and the catalyst has a BET specific surface area of 30 m2/g or more.