Patent ID: 6068824
Filing Date: 2000-05-30
Classification: B01D,B01J

Abstract:
A method for the removal of nitrogen oxides from an exhaust gas containing same, which method comprises:adding ozone into the exhaust gas, and bringing the resultant gas into contact with an adsorbent comprising:(a) at least one material selected from the group of noble metals consisting of platinum, gold, ruthenium, rhodium, and palladium and a compound of one of said noble metals selected from the group consisting of oxides, hydroxides, ammonium salts, nitrates, sulfates, carbonates, acetates, oxalates and halides, and(b) a carrier which comprises at least one member selected from the group consisting of zirconia, titania-silica complex oxide and titania-zirconia complex oxide, thereby causing the adsorbent to adsorb nitrogen oxides contained in the exhaust gas wherein the temperature of the exhaust gas contacting the adsorbent on the carrier is in the range of 0-100.degree. C., wherein the molar ratio of the amount of ozone to nitrogen monoxide is in the range of 1.05 to 5 mol.