PROCESS AND CATALYST SYSTEM FOR SELECTIVE REDUCTION OF NITROGEN OXIDES

摘要

Process for reducing nitrogen oxides to nitrogen in an exhaust gas comprising passing the exhaust gas in the presence of a reducing agent through a catalyst system comprising two or more sandwiched catalyst layers alternately comprising an iron-beta-zeolite (Fe-beta-zeolite) catalyst and a silver supported on alumina (Ag/Al203) catalyst and catalyst system for use in the process.