Process for reducing nitrogen oxides from exhaust gas
First Claim
Patent Images
1. A method of purifying an exhaust gas containing an excess amount of oxygen, which comprises bringing a catalyst into contact with the exhaust gas to remove nitrogen oxides, carbon monoxide and hydrocarbons from the exhaust gas, the catalyst comprising:
- (i) a zeolite having a molar ratio of SiO2 /Al2 O3 of at least 10; and
(ii) at least one copper ion and at least one kind of rare earth ion loaded thereon.
1 Assignment
0 Petitions
Accused Products
Abstract
A catalyst for reducing nitrogen oxides from an exhaust gas containing the same in an oxygen rich atmosphere comprising (i) a zeolite having a molar ratio of SiO2 /Al2 O3 of at least 10, (ii) copper, and (iii) a rare earth ion, an alkaline earth metal and/or a valence variable metal.
-
Citations
13 Claims
-
1. A method of purifying an exhaust gas containing an excess amount of oxygen, which comprises bringing a catalyst into contact with the exhaust gas to remove nitrogen oxides, carbon monoxide and hydrocarbons from the exhaust gas, the catalyst comprising:
-
(i) a zeolite having a molar ratio of SiO2 /Al2 O3 of at least 10; and (ii) at least one copper ion and at least one kind of rare earth ion loaded thereon. - View Dependent Claims (2, 3, 4, 9, 10, 12, 13)
-
-
5. A method of purifying an exhaust gas containing an excess amount of oxygen, which comprises bringing a catalyst into contact with the exhaust gas in the presence of an organic compound to remove nitrogen oxides, carbon monoxide and hydrocarbons from the exhaust gas, the catalyst comprising:
-
(i) a zeolite having a molar ratio of SiO2 /Al2 O3 of at least 10; and (ii) at least one copper ion and at least one kind of alkaline earth metal loaded thereon. - View Dependent Claims (6, 7, 8)
-
-
11. A method of purifying an exhaust gas containing an excess amount of oxygen, which comprises bringing a catalyst into contact with the exhaust gas in the presence of an organic compound to remove nitrogen oxides, carbon monoxide and hydrocarbons from an exhaust gas, the catalyst comprising:
-
(i) a zeolite having a molar ratio of SiO2 /Al2 O3 of at least 10; and (ii) at least one copper ion and at least one kind of valence variable metal loaded thereon.
-
Specification