CATALYST AND METHOD FOR REMOVING NITROGEN OXIDE

摘要

PURPOSE: To reduce and remove nitrogen oxide in exhaust gas in the presence of ammonia by using a honeycomb catalyst for reducing and removing nitrogen oxide in exhaust gas in the presence of ammonia. CONSTITUTION: A nitrogen oxide removing catalyst has pores substantially consisting of two independent pore groups and is characterized by that pore vol. occupied by pore groups having a pore size of 0.01-0.03μm is 50-80% of total pore vol. and pare vol. occupied by pore groups having a poree size of 0.8-4μm is 10-30% of the total pore vol. Exhaust gas is brought into contact with this catalyst to reduce and remove nitrogen oxide in exhaust gas.