CATALYST FOR CATALYTICALLY REDUCING AND REMOVING NITROGEN OXIDES

摘要

PROBLEM TO BE SOLVED: To provide a catalyst with which nitrogen oxides in an exhaust gas are efficiently reduced and removed under an oxidizing atmosphere in which oxygen is contained in an amount of >=1% and SO2 coexists by using a small amount of hydrogen added or hydrogen contained in the exhaust gas. SOLUTION: The catalyst is used for reducing and removing nitrogen oxides with hydrogen being a reducing agent under an oxidizing atmosphere in which SO2 and >=1% oxygen are contained. The catalyst comprises 0.05 to 10 wt.% rhodium and silica.