| 摘要 |
A catalyst for purifying an exhaust gas to remove nitrogen oxides, carbon monoxide and hydrocarbons from an oxygen rich exhaust gas containing the same, comprising (i) a zeolite having an SiO2/Al2O3 mole ratio of at least 15 and (ii)(a) silver and, optionally, (b) an alkali metal and/or an alkaline earth metal incorporated therein. |
