CATALYST, DEVICE FOR REMOVING NITROGEN OXIDE, AND SYSTEM FOR REMOVING NITROGEN OXIDE

摘要

To provide an exhaust gas purification catalyst which has high nitrogen oxide removal performance at both an exhaust gas temperature of 200° C. or lower and an exhaust gas temperature of 500° C. or higher and high durability to the repetitive adsorption and desorption of water vapor. A catalyst contains zeolite having a framework structure containing at least aluminum atoms, phosphorus atoms, and silicon atoms and metal supported on the zeolite. The integrated intensity area of a signal intensity of −130 ppm to −92.5 ppm is 41% or more of the integrated intensity area of a signal intensity of −130 ppm to −50 ppm in the case of measuring a solid-state ²⁹Si-DD/MAS-NMR spectrum after water adsorption.