CATALYST FOR REMOVAL OF NITROGEN OXIDE, AND METHOD FOR REMOVAL OF NITROGEN OXIDE

摘要

The object is to prevent the poisoning of a nitrogen oxide removal catalyst (i.e., a catalyst for removing a nitrogen oxide from an exhaust gas containing the nitrogen oxide) by a phosphorus compound contained in the exhaust gas. Thus, disclosed are: a nitrogen oxide removal catalyst having excellent durability; and a method for removing a nitrogen oxide. Specifically disclosed is a catalyst comprising a porous material having a controlled pore size and an active ingredient carried inside of a pore of the porous material. The pore of the porous material may have a diameter of 8 to 9 ~. Preferably, the diameter of the pore is 8 to 9 ~ as measured by a gas adsorption method which can measure a pore size ranging from 3.4 to 14 ~ or as calculated from a crystalline structure. Alternatively, the porous material may be a mesoporous silica. Preferably, the mesoporous silica has a primary particle diameter of 150 to 300 nm.